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// Copyright (c) 2020 INRA Distributed under the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#ifndef ORG_VLEPROJECT_IRRITATOR_IO_2020
#define ORG_VLEPROJECT_IRRITATOR_IO_2020

#include <irritator/core.hpp>
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#include <irritator/external_source.hpp>
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#include <algorithm>
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#include <istream>
#include <ostream>
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#include <streambuf>
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#include <vector>
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namespace irt {

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static inline const char* dynamics_type_names[] = { "none",
                                                    "qss1_integrator",
                                                    "qss1_multiplier",
                                                    "qss1_cross",
                                                    "qss1_power",
                                                    "qss1_square",
                                                    "qss1_sum_2",
                                                    "qss1_sum_3",
                                                    "qss1_sum_4",
                                                    "qss1_wsum_2",
                                                    "qss1_wsum_3",
                                                    "qss1_wsum_4",
                                                    "qss2_integrator",
                                                    "qss2_multiplier",
                                                    "qss2_cross",
                                                    "qss2_power",
                                                    "qss2_square",
                                                    "qss2_sum_2",
                                                    "qss2_sum_3",
                                                    "qss2_sum_4",
                                                    "qss2_wsum_2",
                                                    "qss2_wsum_3",
                                                    "qss2_wsum_4",
                                                    "qss3_integrator",
                                                    "qss3_multiplier",
                                                    "qss3_cross",
                                                    "qss3_power",
                                                    "qss3_square",
                                                    "qss3_sum_2",
                                                    "qss3_sum_3",
                                                    "qss3_sum_4",
                                                    "qss3_wsum_2",
                                                    "qss3_wsum_3",
                                                    "qss3_wsum_4",
                                                    "integrator",
                                                    "quantifier",
                                                    "adder_2",
                                                    "adder_3",
                                                    "adder_4",
                                                    "mult_2",
                                                    "mult_3",
                                                    "mult_4",
                                                    "counter",
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                                                    "queue",
                                                    "dynamic_queue",
                                                    "priority_queue",
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                                                    "generator",
                                                    "constant",
                                                    "cross",
                                                    "time_func",
                                                    "accumulator_2",
                                                    "flow" };

static_assert(std::size(dynamics_type_names) ==
              static_cast<sz>(dynamics_type_size()));

static inline const char* str_empty[] = { "" };
static inline const char* str_integrator[] = { "x-dot", "reset" };
static inline const char* str_adaptative_integrator[] = { "quanta",
                                                          "x-dot",
                                                          "reset" };
static inline const char* str_in_1[] = { "in" };
static inline const char* str_in_2[] = { "in-1", "in-2" };
static inline const char* str_in_3[] = { "in-1", "in-2", "in-3" };
static inline const char* str_in_4[] = { "in-1", "in-2", "in-3", "in-4" };
static inline const char* str_value_if_else[] = { "value",
                                                  "if",
                                                  "else",
                                                  "threshold" };
static inline const char* str_in_2_nb_2[] = { "in-1", "in-2", "nb-1", "nb-2" };

template<typename Dynamics>
static constexpr const char**
get_input_port_names() noexcept
{
    if constexpr (std::is_same_v<Dynamics, none>)
        return str_empty;

    if constexpr (std::is_same_v<Dynamics, qss1_integrator> ||
                  std::is_same_v<Dynamics, qss2_integrator> ||
                  std::is_same_v<Dynamics, qss3_integrator>)
        return str_integrator;

    if constexpr (std::is_same_v<Dynamics, qss1_multiplier> ||
                  std::is_same_v<Dynamics, qss1_sum_2> ||
                  std::is_same_v<Dynamics, qss1_wsum_2> ||
                  std::is_same_v<Dynamics, qss2_multiplier> ||
                  std::is_same_v<Dynamics, qss2_sum_2> ||
                  std::is_same_v<Dynamics, qss2_wsum_2> ||
                  std::is_same_v<Dynamics, qss3_multiplier> ||
                  std::is_same_v<Dynamics, qss3_sum_2> ||
                  std::is_same_v<Dynamics, qss3_wsum_2> ||
                  std::is_same_v<Dynamics, adder_2> ||
                  std::is_same_v<Dynamics, mult_2>)
        return str_in_2;

    if constexpr (std::is_same_v<Dynamics, qss1_sum_3> ||
                  std::is_same_v<Dynamics, qss1_wsum_3> ||
                  std::is_same_v<Dynamics, qss2_sum_3> ||
                  std::is_same_v<Dynamics, qss2_wsum_3> ||
                  std::is_same_v<Dynamics, qss3_sum_3> ||
                  std::is_same_v<Dynamics, qss3_wsum_3> ||
                  std::is_same_v<Dynamics, adder_3> ||
                  std::is_same_v<Dynamics, mult_3>)
        return str_in_3;

    if constexpr (std::is_same_v<Dynamics, qss1_sum_4> ||
                  std::is_same_v<Dynamics, qss1_wsum_4> ||
                  std::is_same_v<Dynamics, qss2_sum_4> ||
                  std::is_same_v<Dynamics, qss2_wsum_4> ||
                  std::is_same_v<Dynamics, qss3_sum_4> ||
                  std::is_same_v<Dynamics, qss3_wsum_4> ||
                  std::is_same_v<Dynamics, adder_4> ||
                  std::is_same_v<Dynamics, mult_4>)
        return str_in_4;

    if constexpr (std::is_same_v<Dynamics, integrator>)
        return str_adaptative_integrator;

    if constexpr (std::is_same_v<Dynamics, quantifier> ||
                  std::is_same_v<Dynamics, counter> ||
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                  std::is_same_v<Dynamics, queue> ||
                  std::is_same_v<Dynamics, dynamic_queue> ||
                  std::is_same_v<Dynamics, priority_queue> ||
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                  std::is_same_v<Dynamics, qss1_power> ||
                  std::is_same_v<Dynamics, qss2_power> ||
                  std::is_same_v<Dynamics, qss3_power> ||
                  std::is_same_v<Dynamics, qss1_square> ||
                  std::is_same_v<Dynamics, qss2_square> ||
                  std::is_same_v<Dynamics, qss3_square>)
        return str_in_1;

    if constexpr (std::is_same_v<Dynamics, generator> ||
                  std::is_same_v<Dynamics, constant> ||
                  std::is_same_v<Dynamics, time_func> ||
                  std::is_same_v<Dynamics, flow>)
        return str_empty;

    if constexpr (std::is_same_v<Dynamics, qss1_cross> ||
                  std::is_same_v<Dynamics, qss2_cross> ||
                  std::is_same_v<Dynamics, qss3_cross> ||
                  std::is_same_v<Dynamics, cross>)
        return str_value_if_else;

    if constexpr (std::is_same_v<Dynamics, accumulator_2>)
        return str_in_2_nb_2;

    irt_unreachable();
}

static constexpr const char**
get_input_port_names(const dynamics_type type) noexcept
{
    switch (type) {
    case dynamics_type::none:
        return str_empty;

    case dynamics_type::qss1_integrator:
    case dynamics_type::qss2_integrator:
    case dynamics_type::qss3_integrator:
        return str_integrator;

    case dynamics_type::qss1_multiplier:
    case dynamics_type::qss1_sum_2:
    case dynamics_type::qss1_wsum_2:
    case dynamics_type::qss2_multiplier:
    case dynamics_type::qss2_sum_2:
    case dynamics_type::qss2_wsum_2:
    case dynamics_type::qss3_multiplier:
    case dynamics_type::qss3_sum_2:
    case dynamics_type::qss3_wsum_2:
    case dynamics_type::adder_2:
    case dynamics_type::mult_2:
        return str_in_2;

    case dynamics_type::qss1_sum_3:
    case dynamics_type::qss1_wsum_3:
    case dynamics_type::qss2_sum_3:
    case dynamics_type::qss2_wsum_3:
    case dynamics_type::qss3_sum_3:
    case dynamics_type::qss3_wsum_3:
    case dynamics_type::adder_3:
    case dynamics_type::mult_3:
        return str_in_3;

    case dynamics_type::qss1_sum_4:
    case dynamics_type::qss1_wsum_4:
    case dynamics_type::qss2_sum_4:
    case dynamics_type::qss2_wsum_4:
    case dynamics_type::qss3_sum_4:
    case dynamics_type::qss3_wsum_4:
    case dynamics_type::adder_4:
    case dynamics_type::mult_4:
        return str_in_4;

    case dynamics_type::integrator:
        return str_adaptative_integrator;

    case dynamics_type::quantifier:
    case dynamics_type::counter:
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    case dynamics_type::queue:
    case dynamics_type::dynamic_queue:
    case dynamics_type::priority_queue:
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    case dynamics_type::qss1_power:
    case dynamics_type::qss2_power:
    case dynamics_type::qss3_power:
    case dynamics_type::qss1_square:
    case dynamics_type::qss2_square:
    case dynamics_type::qss3_square:
        return str_in_1;

    case dynamics_type::generator:
    case dynamics_type::constant:
    case dynamics_type::time_func:
    case dynamics_type::flow:
        return str_empty;

    case dynamics_type::qss1_cross:
    case dynamics_type::qss2_cross:
    case dynamics_type::qss3_cross:
    case dynamics_type::cross:
        return str_value_if_else;

    case dynamics_type::accumulator_2:
        return str_in_2_nb_2;
    }

    irt_unreachable();
}

static inline const char* str_out_1[] = { "out" };
static inline const char* str_out_cross[] = { "if-value",
                                              "else-value",
                                              "event" };

template<typename Dynamics>
static constexpr const char**
get_output_port_names() noexcept
{
    if constexpr (std::is_same_v<Dynamics, none>)
        return str_empty;

    if constexpr (std::is_same_v<Dynamics, qss1_integrator> ||
                  std::is_same_v<Dynamics, qss1_multiplier> ||
                  std::is_same_v<Dynamics, qss1_power> ||
                  std::is_same_v<Dynamics, qss1_square> ||
                  std::is_same_v<Dynamics, qss1_sum_2> ||
                  std::is_same_v<Dynamics, qss1_sum_3> ||
                  std::is_same_v<Dynamics, qss1_sum_4> ||
                  std::is_same_v<Dynamics, qss1_wsum_2> ||
                  std::is_same_v<Dynamics, qss1_wsum_3> ||
                  std::is_same_v<Dynamics, qss1_wsum_4> ||
                  std::is_same_v<Dynamics, qss2_integrator> ||
                  std::is_same_v<Dynamics, qss2_multiplier> ||
                  std::is_same_v<Dynamics, qss2_power> ||
                  std::is_same_v<Dynamics, qss2_square> ||
                  std::is_same_v<Dynamics, qss2_sum_2> ||
                  std::is_same_v<Dynamics, qss2_sum_3> ||
                  std::is_same_v<Dynamics, qss2_sum_4> ||
                  std::is_same_v<Dynamics, qss2_wsum_2> ||
                  std::is_same_v<Dynamics, qss2_wsum_3> ||
                  std::is_same_v<Dynamics, qss2_wsum_4> ||
                  std::is_same_v<Dynamics, qss3_integrator> ||
                  std::is_same_v<Dynamics, qss3_multiplier> ||
                  std::is_same_v<Dynamics, qss3_power> ||
                  std::is_same_v<Dynamics, qss3_square> ||
                  std::is_same_v<Dynamics, qss3_sum_2> ||
                  std::is_same_v<Dynamics, qss3_sum_3> ||
                  std::is_same_v<Dynamics, qss3_sum_4> ||
                  std::is_same_v<Dynamics, qss3_wsum_2> ||
                  std::is_same_v<Dynamics, qss3_wsum_3> ||
                  std::is_same_v<Dynamics, qss3_wsum_4> ||
                  std::is_same_v<Dynamics, integrator> ||
                  std::is_same_v<Dynamics, quantifier> ||
                  std::is_same_v<Dynamics, adder_2> ||
                  std::is_same_v<Dynamics, adder_3> ||
                  std::is_same_v<Dynamics, adder_4> ||
                  std::is_same_v<Dynamics, mult_2> ||
                  std::is_same_v<Dynamics, mult_3> ||
                  std::is_same_v<Dynamics, mult_4> ||
                  std::is_same_v<Dynamics, counter> ||
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                  std::is_same_v<Dynamics, queue> ||
                  std::is_same_v<Dynamics, dynamic_queue> ||
                  std::is_same_v<Dynamics, priority_queue> ||
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                  std::is_same_v<Dynamics, generator> ||
                  std::is_same_v<Dynamics, constant> ||
                  std::is_same_v<Dynamics, time_func> ||
                  std::is_same_v<Dynamics, flow>)
        return str_out_1;

    if constexpr (std::is_same_v<Dynamics, cross> ||
                  std::is_same_v<Dynamics, qss1_cross> ||
                  std::is_same_v<Dynamics, qss2_cross> ||
                  std::is_same_v<Dynamics, qss3_cross>)
        return str_out_cross;

    if constexpr (std::is_same_v<Dynamics, accumulator_2>)
        return str_empty;

    irt_unreachable();
}

static constexpr const char**
get_output_port_names(const dynamics_type type) noexcept
{
    switch (type) {
    case dynamics_type::none:
        return str_empty;

    case dynamics_type::qss1_integrator:
    case dynamics_type::qss1_multiplier:
    case dynamics_type::qss1_power:
    case dynamics_type::qss1_square:
    case dynamics_type::qss1_sum_2:
    case dynamics_type::qss1_sum_3:
    case dynamics_type::qss1_sum_4:
    case dynamics_type::qss1_wsum_2:
    case dynamics_type::qss1_wsum_3:
    case dynamics_type::qss1_wsum_4:
    case dynamics_type::qss2_integrator:
    case dynamics_type::qss2_multiplier:
    case dynamics_type::qss2_power:
    case dynamics_type::qss2_square:
    case dynamics_type::qss2_sum_2:
    case dynamics_type::qss2_sum_3:
    case dynamics_type::qss2_sum_4:
    case dynamics_type::qss2_wsum_2:
    case dynamics_type::qss2_wsum_3:
    case dynamics_type::qss2_wsum_4:
    case dynamics_type::qss3_integrator:
    case dynamics_type::qss3_multiplier:
    case dynamics_type::qss3_power:
    case dynamics_type::qss3_square:
    case dynamics_type::qss3_sum_2:
    case dynamics_type::qss3_sum_3:
    case dynamics_type::qss3_sum_4:
    case dynamics_type::qss3_wsum_2:
    case dynamics_type::qss3_wsum_3:
    case dynamics_type::qss3_wsum_4:
    case dynamics_type::integrator:
    case dynamics_type::quantifier:
    case dynamics_type::adder_2:
    case dynamics_type::adder_3:
    case dynamics_type::adder_4:
    case dynamics_type::mult_2:
    case dynamics_type::mult_3:
    case dynamics_type::mult_4:
    case dynamics_type::counter:
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    case dynamics_type::queue:
    case dynamics_type::dynamic_queue:
    case dynamics_type::priority_queue:
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    case dynamics_type::generator:
    case dynamics_type::constant:
    case dynamics_type::time_func:
    case dynamics_type::flow:
        return str_out_1;

    case dynamics_type::cross:
    case dynamics_type::qss1_cross:
    case dynamics_type::qss2_cross:
    case dynamics_type::qss3_cross:
        return str_out_cross;

    case dynamics_type::accumulator_2:
        return str_empty;
    }

    irt_unreachable();
}

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class streambuf : public std::streambuf
{
public:
    std::streambuf* m_stream_buffer = { nullptr };
    std::streamsize m_file_position = { 0 };
    int m_line_number = { 1 };
    int m_last_line_number = { 1 };
    int m_column = { 0 };
    int m_prev_column = { -1 };

    streambuf(std::streambuf* sbuf)
      : m_stream_buffer(sbuf)
    {}

    streambuf(const streambuf&) = delete;
    streambuf& operator=(const streambuf&) = delete;

protected:
    std::streambuf::int_type underflow() override final
    {
        return m_stream_buffer->sgetc();
    }

    std::streambuf::int_type uflow() override final
    {
        int_type rc = m_stream_buffer->sbumpc();

        m_last_line_number = m_line_number;
        if (traits_type::eq_int_type(rc, traits_type::to_int_type('\n'))) {
            ++m_line_number;
            m_prev_column = m_column + 1;
            m_column = -1;
        }

        ++m_column;
        ++m_file_position;

        return rc;
    }

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    std::streambuf::int_type pbackfail(
      std::streambuf::int_type c) override final
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    {
        if (traits_type::eq_int_type(c, traits_type::to_int_type('\n'))) {
            --m_line_number;
            m_last_line_number = m_line_number;
            m_column = m_prev_column;
            m_prev_column = 0;
        }

        --m_column;
        --m_file_position;

        if (c != traits_type::eof())
            return m_stream_buffer->sputbackc(traits_type::to_char_type(c));

        return m_stream_buffer->sungetc();
    }

    std::ios::pos_type seekoff(std::ios::off_type pos,
                               std::ios_base::seekdir dir,
                               std::ios_base::openmode mode) override final
    {
        if (dir == std::ios_base::beg &&
            pos == static_cast<std::ios::off_type>(0)) {
            m_last_line_number = 1;
            m_line_number = 1;
            m_column = 0;
            m_prev_column = -1;
            m_file_position = 0;

            return m_stream_buffer->pubseekoff(pos, dir, mode);
        }

        return std::streambuf::seekoff(pos, dir, mode);
    }

    std::ios::pos_type seekpos(std::ios::pos_type pos,
                               std::ios_base::openmode mode) override final
    {
        if (pos == static_cast<std::ios::pos_type>(0)) {
            m_last_line_number = 1;
            m_line_number = 1;
            m_column = 0;
            m_prev_column = -1;
            m_file_position = 0;

            return m_stream_buffer->pubseekpos(pos, mode);
        }

        return std::streambuf::seekpos(pos, mode);
    }
};

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class reader
{
private:
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    streambuf buf;
    std::istream is;
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    struct mapping
    {
        mapping(int index_, u64 value_)
          : index(index_)
          , value(value_)
        {}

        int index = 0;
        u64 value = 0u;

        bool operator<(const mapping& other) const noexcept
        {
            return index < other.index;
        }
    };

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    std::vector<model_id> map;
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    std::vector<mapping> constant_mapping;
    std::vector<mapping> binary_file_mapping;
    std::vector<mapping> random_mapping;
    std::vector<mapping> text_file_mapping;
    int source_number = 0;
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    int model_number = 0;
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    char temp_1[32];
    char temp_2[32];

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public:
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    reader(std::istream& is_) noexcept
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      : buf(is_.rdbuf())
      , is(&buf)
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    {}

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    ~reader() noexcept = default;
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    int model_error = 0;
    int connection_error = 0;

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    int line_error() const noexcept
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    {
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        return buf.m_line_number;
    }

    int column_error() const noexcept
    {
        return buf.m_column;
    }
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    status operator()(simulation& sim, external_source& srcs) noexcept
    {
        irt_return_if_bad(do_read_data_source(srcs));

        irt_return_if_bad(do_read_model_number());
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        for (int i = 0; i != model_number; ++i, ++model_error) {
            int id;
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            irt_return_if_bad(do_read_model(sim, &id));
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        }

        irt_return_if_bad(do_read_connections(sim));

        return status::success;
    }

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    status operator()(simulation& sim,
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                      external_source& srcs,
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                      function_ref<void(const model_id)> f) noexcept
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    {
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        irt_return_if_bad(do_read_data_source(srcs));
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        irt_return_if_bad(do_read_model_number());
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        for (int i = 0; i != model_number; ++i, ++model_error) {
            int id;
            irt_return_if_bad(do_read_model(sim, &id));
            f(map[id]);
        }

        irt_return_if_bad(do_read_connections(sim));

        return status::success;
    }

private:
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    status do_read_binary_file_source(external_source& srcs) noexcept
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    {
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        u32 id;

        if (!(is >> id))
            return status::io_file_format_error;

        auto& elem = srcs.binary_file_sources.alloc();
        if (auto ret = elem.init(srcs.block_size, srcs.block_number);
            is_bad(ret)) {
            srcs.binary_file_sources.free(elem);
            return ret;
        }

        auto elem_id = srcs.binary_file_sources.get_id(elem);

        std::string file_path;
        if (!(is >> std::quoted(file_path)))
            return status::io_file_format_error;

        elem.file_path = file_path;
        binary_file_mapping.emplace_back(id, ordinal(elem_id));

        return status::success;
    }

    status do_read_text_file_source(external_source& srcs) noexcept
    {
        u32 id;

        if (!(is >> id))
            return status::io_file_format_error;

        auto& elem = srcs.text_file_sources.alloc();
        if (auto ret = elem.init(srcs.block_size, srcs.block_number);
            is_bad(ret)) {
            srcs.text_file_sources.free(elem);
            return ret;
        }

        auto elem_id = srcs.text_file_sources.get_id(elem);

        std::string file_path;
        if (!(is >> std::quoted(file_path)))
            return status::io_file_format_error;

        elem.file_path = file_path;
        text_file_mapping.emplace_back(id, ordinal(elem_id));

        return status::success;
    }

    status do_read_constant_source(external_source& srcs) noexcept
    {
        u32 id;
        sz size;

        if (!(is >> id >> size))
            return status::io_file_format_error;

        auto& cst = srcs.constant_sources.alloc();
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        if (auto ret = cst.init(srcs.block_size); is_bad(ret)) {
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            srcs.constant_sources.free(cst);
            return ret;
        }

        auto cst_id = srcs.constant_sources.get_id(cst);

        try {
            constant_mapping.emplace_back(id, ordinal(cst_id));
        } catch (const std::bad_alloc& /*e*/) {
            return status::io_not_enough_memory;
        }

        for (size_t i = 0; i < size; ++i) {
            if (!(is >> cst.buffer[i]))
                return status::io_file_format_error;
        }

        return status::success;
    }

    status do_read_random_source(external_source& srcs) noexcept
    {
        u32 id;

        if (!(is >> id))
            return status::io_file_format_error;

        char type_str[30];
        if (!(is >> type_str))
            return status::io_file_format_error;

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        auto it = binary_find(std::begin(distribution_type_string),
                              std::end(distribution_type_string),
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                              type_str,
                              [](const char* left, const char* right) {
                                  return std::strcmp(left, right) == 0;
                              });

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        if (it == std::end(distribution_type_string))
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            return status::io_file_format_error;

        const auto dist_id =
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          std::distance(std::begin(distribution_type_string), it);
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        auto& elem = srcs.random_sources.alloc();
        if (auto ret = elem.init(srcs.block_size, srcs.block_number);
            is_bad(ret)) {
            srcs.random_sources.free(elem);
            return ret;
        }

        auto elem_id = srcs.random_sources.get_id(elem);

        try {
            random_mapping.emplace_back(id, ordinal(elem_id));
        } catch (const std::bad_alloc& /*e*/) {
            return status::io_not_enough_memory;
        }

        elem.distribution = enum_cast<distribution_type>(dist_id);

        switch (elem.distribution) {
        case distribution_type::uniform_int:
            if (!(is >> elem.a32 >> elem.b32))
                return status::io_file_format_error;
            break;

        case distribution_type::uniform_real:
            if (!(is >> elem.a >> elem.b))
                return status::io_file_format_error;
            break;

        case distribution_type::bernouilli:
            if (!(is >> elem.p))
                return status::io_file_format_error;
            break;

        case distribution_type::binomial:
            if (!(is >> elem.t32 >> elem.p))
                return status::io_file_format_error;
            break;

        case distribution_type::negative_binomial:
            if (!(is >> elem.t32 >> elem.p))
                return status::io_file_format_error;
            break;

        case distribution_type::geometric:
            if (!(is >> elem.p))
                return status::io_file_format_error;
            break;

        case distribution_type::poisson:
            if (!(is >> elem.mean))
                return status::io_file_format_error;
            break;

        case distribution_type::exponential:
            if (!(is >> elem.lambda))
                return status::io_file_format_error;
            break;

        case distribution_type::gamma:
            if (!(is >> elem.alpha >> elem.beta))
                return status::io_file_format_error;
            break;

        case distribution_type::weibull:
            if (!(is >> elem.a >> elem.b))
                return status::io_file_format_error;
            break;

        case distribution_type::exterme_value:
            if (!(is >> elem.a >> elem.b))
                return status::io_file_format_error;
            break;

        case distribution_type::normal:
            if (!(is >> elem.mean >> elem.stddev))
                return status::io_file_format_error;
            break;

        case distribution_type::lognormal:
            if (!(is >> elem.m >> elem.s))
                return status::io_file_format_error;
            break;

        case distribution_type::chi_squared:
            if (!(is >> elem.n))
                return status::io_file_format_error;
            break;

        case distribution_type::cauchy:
            if (!(is >> elem.a >> elem.b))
                return status::io_file_format_error;
            break;

        case distribution_type::fisher_f:
            if (!(is >> elem.m >> elem.n))
                return status::io_file_format_error;
            break;

        case distribution_type::student_t:
            if (!(is >> elem.n))
                return status::io_file_format_error;
            break;
        }

        return status::success;
    }

    status do_read_data_source(external_source& srcs) noexcept
    {
        size_t number;

        /* Read the constant sources */
        if (!(is >> number))
            return status::io_file_format_source_number_error;

        if (number > 0u) {
            if (!srcs.constant_sources.can_alloc(number))
                return status::io_file_source_full;

            for (sz i = 0; i < number; ++i)
                irt_return_if_bad(do_read_constant_source(srcs));
        }

        /* Read the binary sources */
        if (!(is >> number))
            return status::io_file_format_error;

        if (number > 0u) {
            if (!srcs.binary_file_sources.can_alloc(number))
                return status::io_file_source_full;

            for (sz i = 0; i < number; ++i)
                irt_return_if_bad(do_read_binary_file_source(srcs));
        }

        /* Read the text file sources */
        if (!(is >> number))
            return status::io_file_format_error;

        if (number > 0u) {
            if (!srcs.text_file_sources.can_alloc(number))
                return status::io_file_source_full;

            for (sz i = 0; i < number; ++i)
                irt_return_if_bad(do_read_text_file_source(srcs));
        }

        /* Read the random sources */
        if (!(is >> number))
            return status::io_file_format_error;

        if (number > 0u) {
            if (!srcs.random_sources.can_alloc(number))
                return status::io_file_source_full;

            for (sz i = 0; i < number; ++i) {
                irt_return_if_bad(do_read_random_source(srcs));
            }
        }

        std::sort(std::begin(constant_mapping), std::end(constant_mapping));
        std::sort(std::begin(binary_file_mapping),
                  std::end(binary_file_mapping));
        std::sort(std::begin(text_file_mapping), std::end(text_file_mapping));
        std::sort(std::begin(random_mapping), std::end(random_mapping));

        return status::success;
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    }

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    status do_read_model_number() noexcept
    {
        model_number = 0;
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        irt_return_if_fail((is >> model_number), status::io_file_format_error);
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        irt_return_if_fail(model_number > 0,
                           status::io_file_format_model_number_error);

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        try {
            map.resize(model_number, model_id{ 0 });
        } catch (const std::bad_alloc& /*e*/) {
            return status::io_not_enough_memory;
        }
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        return status::success;
    }
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    status do_read_model(simulation& sim, int* id) noexcept
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    {
        irt_return_if_fail((is >> *id >> temp_1),
                           status::io_file_format_model_error);
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        irt_return_if_fail(0 <= *id && *id < model_number,
                           status::io_file_format_model_error);
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        irt_return_if_bad(do_read_dynamics(sim, *id, temp_1));
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        return status::success;
    }

    status do_read_connections(simulation& sim) noexcept
    {
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        while (is) {
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            int mdl_src_id, port_src_index, mdl_dst_id, port_dst_index;
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            if (!(is >> mdl_src_id >> port_src_index >> mdl_dst_id >>
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                  port_dst_index)) {
                if (is.eof())
                    break;
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                irt_bad_return(status::io_file_format_error);
            }
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            irt_return_if_fail(0 <= mdl_src_id && mdl_src_id < model_number,
                               status::io_file_format_model_error);
            irt_return_if_fail(0 <= mdl_dst_id && mdl_dst_id < model_number,
                               status::io_file_format_model_error);

            auto* mdl_src = sim.models.try_to_get(map[mdl_src_id]);
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            irt_return_if_fail(mdl_src, status::io_file_format_model_unknown);
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            auto* mdl_dst = sim.models.try_to_get(map[mdl_dst_id]);
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            irt_return_if_fail(mdl_dst, status::io_file_format_model_unknown);
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            port* output_port = nullptr;
            port* input_port = nullptr;
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            irt_return_if_bad(
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              sim.get_output_port(*mdl_src, port_src_index, output_port));
            irt_return_if_bad(
              sim.get_input_port(*mdl_dst, port_dst_index, input_port));

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            irt_return_if_bad(
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              sim.connect(*mdl_src, port_src_index, *mdl_dst, port_dst_index));
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            ++connection_error;
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        }

        return status::success;
    }

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    bool convert(const std::string_view dynamics_name,
                 dynamics_type* type) noexcept
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    {
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        struct string_to_type
        {
            constexpr string_to_type(const std::string_view n,
                                     const dynamics_type t)
              : name(n)
              , type(t)
            {}

            const std::string_view name;
            dynamics_type type;
        };

        static constexpr string_to_type table[] = {
            { "accumulator_2", dynamics_type::accumulator_2 },
            { "adder_2", dynamics_type::adder_2 },
            { "adder_3", dynamics_type::adder_3 },
            { "adder_4", dynamics_type::adder_4 },
            { "constant", dynamics_type::constant },
            { "counter", dynamics_type::counter },
            { "cross", dynamics_type::cross },
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            { "dynamic_queue", dynamics_type::dynamic_queue },
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            { "flow", dynamics_type::flow },
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            { "generator", dynamics_type::generator },
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            { "integrator", dynamics_type::integrator },
            { "mult_2", dynamics_type::mult_2 },
            { "mult_3", dynamics_type::mult_3 },
            { "mult_4", dynamics_type::mult_4 },
            { "none", dynamics_type::none },
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            { "priority_queue", dynamics_type::priority_queue },
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            { "qss1_cross", dynamics_type::qss1_cross },
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            { "qss1_integrator", dynamics_type::qss1_integrator },
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            { "qss1_multiplier", dynamics_type::qss1_multiplier },
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            { "qss1_power", dynamics_type::qss1_power },
            { "qss1_square", dynamics_type::qss1_square },
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            { "qss1_sum_2", dynamics_type::qss1_sum_2 },
            { "qss1_sum_3", dynamics_type::qss1_sum_3 },
            { "qss1_sum_4", dynamics_type::qss1_sum_4 },
            { "qss1_wsum_2", dynamics_type::qss1_wsum_2 },
            { "qss1_wsum_3", dynamics_type::qss1_wsum_3 },
            { "qss1_wsum_4", dynamics_type::qss1_wsum_4 },
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            { "qss2_cross", dynamics_type::qss2_cross },
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            { "qss2_integrator", dynamics_type::qss2_integrator },
            { "qss2_multiplier", dynamics_type::qss2_multiplier },
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            { "qss2_power", dynamics_type::qss2_power },
            { "qss2_square", dynamics_type::qss2_square },
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            { "qss2_sum_2", dynamics_type::qss2_sum_2 },
            { "qss2_sum_3", dynamics_type::qss2_sum_3 },
            { "qss2_sum_4", dynamics_type::qss2_sum_4 },
            { "qss2_wsum_2", dynamics_type::qss2_wsum_2 },
            { "qss2_wsum_3", dynamics_type::qss2_wsum_3 },
            { "qss2_wsum_4", dynamics_type::qss2_wsum_4 },
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            { "qss3_cross", dynamics_type::qss3_cross },
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            { "qss3_integrator", dynamics_type::qss3_integrator },
            { "qss3_multiplier", dynamics_type::qss3_multiplier },
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            { "qss3_power", dynamics_type::qss3_power },
            { "qss3_square", dynamics_type::qss3_square },
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            { "qss3_sum_2", dynamics_type::qss3_sum_2 },
            { "qss3_sum_3", dynamics_type::qss3_sum_3 },
            { "qss3_sum_4", dynamics_type::qss3_sum_4 },
            { "qss3_wsum_2", dynamics_type::qss3_wsum_2 },
            { "qss3_wsum_3", dynamics_type::qss3_wsum_3 },
            { "qss3_wsum_4", dynamics_type::qss3_wsum_4 },
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            { "quantifier", dynamics_type::quantifier },
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            { "queue", dynamics_type::queue },
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            { "time_func", dynamics_type::time_func }
        };

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        static_assert(std::size(table) ==
                      static_cast<sz>(dynamics_type_size()));
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        const auto it =
          std::lower_bound(std::begin(table),
                           std::end(table),
                           dynamics_name,
                           [](const string_to_type& l,
                              const std::string_view r) { return l.name < r; });

        if (it != std::end(table) && it->name == dynamics_name) {
            *type = it->type;
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            return true;
        }

        return false;
    }

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    status do_read_dynamics(simulation& sim,
                            int id,
                            const char* dynamics_name) noexcept
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    {
        dynamics_type type;

        irt_return_if_fail(convert(dynamics_name, &type),
                           status::io_file_format_dynamics_unknown);

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        auto& mdl = sim.alloc(type);
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        auto ret = sim.dispatch(
          mdl, [this, &sim]<typename Dynamics>(Dynamics& dyn) -> status {
              irt_return_if_fail(this->read(sim, dyn),
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                                 status::io_file_format_dynamics_init_error);
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              return status::success;
          });
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        irt_return_if_bad(ret);

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        map[id] = sim.models.get_id(mdl);
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        return status::success;
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    }

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    bool read(simulation& /*sim*/, none& /*dyn*/) noexcept
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    {
        return true;
    }

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    bool read(simulation& /*sim*/, qss1_integrator& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_X));
        double& x2 = *(const_cast<double*>(&dyn.default_dQ));

        return !!(is >> x1 >> x2);
    }

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    bool read(simulation& /*sim*/, qss2_integrator& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_X));
        double& x2 = *(const_cast<double*>(&dyn.default_dQ));

        return !!(is >> x1 >> x2);
    }

1053
    bool read(simulation& /*sim*/, qss3_integrator& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_X));
        double& x2 = *(const_cast<double*>(&dyn.default_dQ));

        return !!(is >> x1 >> x2);
    }

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    bool read(simulation& /*sim*/, qss1_multiplier& /*dyn*/) noexcept
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    {
        return true;
    }

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    bool read(simulation& /*sim*/, qss1_sum_2& /*dyn*/) noexcept
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    {
        return true;
    }

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    bool read(simulation& /*sim*/, qss1_sum_3& /*dyn*/) noexcept
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    {
        return true;
    }

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    bool read(simulation& /*sim*/, qss1_sum_4& /*dyn*/) noexcept
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    {
        return true;
    }

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    bool read(simulation& /*sim*/, qss1_wsum_2& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));

        return !!(is >> x1 >> x2);
    }

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    bool read(simulation& /*sim*/, qss1_wsum_3& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3);
    }

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    bool read(simulation& /*sim*/, qss1_wsum_4& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));
        double& x4 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3 >> x4);
    }
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    bool read(simulation& /*sim*/, qss2_multiplier& /*dyn*/) noexcept
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    {
        return true;
    }

1113
    bool read(simulation& /*sim*/, qss2_sum_2& /*dyn*/) noexcept
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    {
        return true;
    }

1118
    bool read(simulation& /*sim*/, qss2_sum_3& /*dyn*/) noexcept
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    {
        return true;
    }

1123
    bool read(simulation& /*sim*/, qss2_sum_4& /*dyn*/) noexcept
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    {
        return true;
    }

1128
    bool read(simulation& /*sim*/, qss2_wsum_2& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));

        return !!(is >> x1 >> x2);
    }

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    bool read(simulation& /*sim*/, qss2_wsum_3& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3);
    }

1145
    bool read(simulation& /*sim*/, qss2_wsum_4& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));
        double& x4 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3 >> x4);
    }

1155
    bool read(simulation& /*sim*/, qss3_multiplier& /*dyn*/) noexcept
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    {
        return true;
    }

1160
    bool read(simulation& /*sim*/, qss3_sum_2& /*dyn*/) noexcept
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    {
        return true;
    }

1165
    bool read(simulation& /*sim*/, qss3_sum_3& /*dyn*/) noexcept
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    {
        return true;
    }

1170
    bool read(simulation& /*sim*/, qss3_sum_4& /*dyn*/) noexcept
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    {
        return true;
    }

1175
    bool read(simulation& /*sim*/, qss3_wsum_2& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));

        return !!(is >> x1 >> x2);
    }

1183
    bool read(simulation& /*sim*/, qss3_wsum_3& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3);
    }

1192
    bool read(simulation& /*sim*/, qss3_wsum_4& dyn) noexcept
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    {
        double& x1 = *(const_cast<double*>(&dyn.default_input_coeffs[0]));
        double& x2 = *(const_cast<double*>(&dyn.default_input_coeffs[1]));
        double& x3 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));
        double& x4 = *(const_cast<double*>(&dyn.default_input_coeffs[2]));

        return !!(is >> x1 >> x2 >> x3 >> x4);
    }

1202
    bool read(simulation& /*sim*/, integrator& dyn) noexcept
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    {
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        return !!(is >> dyn.default_current_value >> dyn.default_reset_value);
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    }

1207
    bool read(simulation& /*sim*/, quantifier& dyn) noexcept
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    {
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        if (!(is >> dyn.default_step_size >> dyn.default_past_length >>
              temp_1 >> temp_2))
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            return false;

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        if (std::strcmp(temp_1, "possible") == 0)
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            dyn.default_adapt_state = quantifier::adapt_state::possible;
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        else if (std::strcmp(temp_1, "impossible") == 0)
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            dyn.default_adapt_state = quantifier::adapt_state::impossible;
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        else if (std::strcmp(temp_1, "done") == 0)
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            dyn.default_adapt_state = quantifier::adapt_state::done;
        else
            return false;

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        if (std::strcmp(temp_2, "true") == 0)
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            dyn.default_zero_init_offset = true;
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        else if (std::strcmp(temp_2, "false") == 0)
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            dyn.default_zero_init_offset = false;
        else
            return false;

        return true;
    }

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    bool read(simulation& /*sim*/, adder_2& dyn) noexcept
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    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_input_coeffs[0] >> dyn.default_input_coeffs[1]);
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    }

1238
    bool read(simulation& /*sim*/, adder_3& dyn) noexcept
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    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_values[2] >> dyn.default_input_coeffs[0] >>
                  dyn.default_input_coeffs[1] >> dyn.default_input_coeffs[2]);
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    }

1245
    bool read(simulation& /*sim*/, adder_4& dyn) noexcept
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    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_values[2] >> dyn.default_values[3] >>
                  dyn.default_input_coeffs[0] >> dyn.default_input_coeffs[1] >>
                  dyn.default_input_coeffs[2] >> dyn.default_input_coeffs[3]);
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    }

1253
    bool read(simulation& /*sim*/, mult_2& dyn) noexcept
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    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_input_coeffs[0] >> dyn.default_input_coeffs[1]);
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    }

1259
    bool read(simulation& /*sim*/, mult_3& dyn) noexcept
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    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_values[2] >> dyn.default_input_coeffs[0] >>
                  dyn.default_input_coeffs[1] >> dyn.default_input_coeffs[2]);
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    }

1266
    bool read(simulation& /*sim*/, mult_4& dyn) noexcept
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    {
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        return !!(is >> dyn.default_values[0] >> dyn.default_values[1] >>
                  dyn.default_values[2] >> dyn.default_values[3] >>
                  dyn.default_input_coeffs[0] >> dyn.default_input_coeffs[1] >>
                  dyn.default_input_coeffs[2] >> dyn.default_input_coeffs[3]);
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    }

1274
    bool read(simulation& /*sim*/, counter& /*dyn*/) noexcept
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    {
        return true;
    }

1279
    bool read(simulation& /*sim*/, queue& dyn) noexcept
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    {
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        return !!(is >> dyn.default_ta);
    }

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    bool read_source(simulation& /*sim*/,
                     source& src,
                     int index,
                     external_source_type type)
    {
        switch (type) {
        case external_source_type::binary_file: {
            auto it = binary_find(
              binary_file_mapping.begin(),
              binary_file_mapping.end(),
              index,
              [](const auto elem, int i) { return i == elem.index; });

            if (it == binary_file_mapping.end())
                return false;

            src.type = ordinal(type);
            src.id = it->value;
            return true;
        };

        case external_source_type::constant: {
            auto it = binary_find(
              constant_mapping.begin(),
              constant_mapping.end(),
              index,
              [](const auto elem, int i) { return i == elem.index; });
            if (it == constant_mapping.end())
                return false;

            src.type = ordinal(type);
            src.id = it->value;
            return true;
        };

        case external_source_type::text_file: {
            auto it = binary_find(
              text_file_mapping.begin(),
              text_file_mapping.end(),
              index,
              [](const auto elem, int i) { return i == elem.index; });
            if (it == text_file_mapping.end())
                return false;

            src.type = ordinal(type);
            src.id = it->value;
            return true;
        };

        case external_source_type::random: {
            auto it = binary_find(
              random_mapping.begin(),
              random_mapping.end(),
              index,
              [](const auto elem, int i) { return i == elem.index; });
            if (it == random_mapping.end())
                return false;

            src.type = ordinal(type);
            src.id = it->value;
            return true;
        };
        }

        irt_unreachable();
    }

    bool read(simulation& sim, dynamic_queue& dyn) noexcept
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    {
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        int index;
        int type;

        if (!(is >> index >> type))
            return false;

        external_source_type source_type;
        if (external_source_type_cast(type, &source_type)) {
            if (!read_source(sim, dyn.default_source_ta, index, source_type))
                return false;
        }

        return true;
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    }

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    bool read(simulation& sim, priority_queue& dyn) noexcept
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    {
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        int index;
        int type;

        if (!(is >> index >> type))
            return false;

        external_source_type source_type;
        if (external_source_type_cast(type, &source_type)) {
            if (!read_source(sim, dyn.default_source_ta, index, source_type))
                return false;
        }

        return true;
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    }

1385
    bool read(simulation& sim, generator& dyn) noexcept
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    {
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        int index[2];
        int type[2];

        if (!(is >> dyn.default_offset >> index[0] >> type[0] >> index[1] >>
              type[1]))
            return false;

        external_source_type source_type;
        if (external_source_type_cast(type[0], &source_type)) {
            if (!read_source(sim, dyn.default_source_ta, index[0], source_type))
                return false;
        }

        if (external_source_type_cast(type[1], &source_type)) {
            if (!read_source(
                  sim, dyn.default_source_value, index[1], source_type))
                return false;
        }

        return true;
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    }

1409
    bool read(simulation& /*sim*/, constant& dyn) noexcept
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    {
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        return !!(is >> dyn.default_value);
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    }

1414
    bool read(simulation& /*sim*/, qss1_cross& dyn) noexcept
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    {
        return !!(is >> dyn.default_threshold);
    }

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    bool read(simulation& /*sim*/, qss2_cross& dyn) noexcept
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    {
        return !!(is >> dyn.default_threshold);
    }

1424
    bool read(simulation& /*sim*/, qss3_cross& dyn) noexcept
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    {
        return !!(is >> dyn.default_threshold);
    }

1429
    bool read(simulation& /*sim*/, qss1_power& dyn) noexcept
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    {
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        return !!(is >> dyn.default_n);
    }

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    bool read(simulation& /*sim*/, qss2_power& dyn) noexcept
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    {
        return !!(is >> dyn.default_n);
    }

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    bool read(simulation& /*sim*/, qss3_power& dyn) noexcept
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    {
        return !!(is >> dyn.default_n);
    }

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    bool read(simulation& /*sim*/, qss1_square& /*dyn*/) noexcept
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    {
        return true;
    }

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    bool read(simulation& /*sim*/, qss2_square& /*dyn*/) noexcept
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    {
        return true;
    }

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    bool read(simulation& /*sim*/, qss3_square& /*dyn*/) noexcept
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    {
        return true;
    }

1459
    bool read(simulation& /*sim*/, cross& dyn) noexcept
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    {
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        return !!(is >> dyn.default_threshold);
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    }

1464
    bool read(simulation& /*sim*/, accumulator_2& /*dyn*/) noexcept
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    {
        return true;
    }

1469
    bool read(simulation& /*sim*/, time_func& dyn) noexcept
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    {
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        if (!(is >> temp_1))
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            return false;

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        if (std::strcmp(temp_1, "sin") == 0)
            dyn.default_f = &sin_time_function;
        else if (std::strcmp(temp_1, "square") == 0)
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            dyn.default_f = &square_time_function;
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        else
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            dyn.default_f = &time_function;
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        return true;
    }
1483

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    bool read(simulation& /*sim*/, flow& dyn) noexcept
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    {
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        return !!(is >> dyn.default_samplerate);
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    }
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};

struct writer
{
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    std::ostream& os;