core: change observation functions

This patchs changes the behaviour of observation function in QSS
integrator. Now, these function returns value, u, mu and pu value if
available. Observer callback must compute the values but can produce
better outputs.

lib/include/irritator/core.hpp

@@ -2739,7 +2739,7 @@ struct integrator
 
     message observation(const time /*e*/) const noexcept
     {
-        return message(last_output_value);
+        return { last_output_value };
     }
 
     status ta() noexcept
@@ -2938,9 +2938,9 @@ struct abstract_integrator<1>
         return status::success;
     }
 
-    message observation(const time e) const noexcept
+    message observation(const time /*e*/) const noexcept
     {
-        return message(X + u * e);
+        return { X, u };
     }
 };
 
@@ -3111,9 +3111,9 @@ struct abstract_integrator<2>
         return status::success;
     }
 
-    message observation(const time e) const noexcept
+    message observation(const time /*e*/) const noexcept
     {
-        return X + (u * e) + (mu / 2.0) * (e * e);
+        return { X, u, mu };
     }
 };
 
@@ -3447,9 +3447,9 @@ struct abstract_integrator<3>
         return status::success;
     }
 
-    message observation(const time e) const noexcept
+    message observation(const time /*e*/) const noexcept
     {
-        return X + u * e + (mu * e * e) / 2 + (pu * e * e * e) / 3;
+        return { X, u, mu, pu };
     }
 };
 
@@ -3540,7 +3540,7 @@ struct abstract_power
 
     message observation(const time /*e*/) const noexcept
     {
-        return value[0];
+        return { value[0] };
     }
 };
 
@@ -3626,7 +3626,7 @@ struct abstract_square
 
     message observation(const time /*e*/) const noexcept
     {
-        return value[0];
+        return { value[0] };
     }
 };
 
@@ -3774,7 +3774,7 @@ struct abstract_sum
                 value += values[i + PortNumber + PortNumber] * e * e;
         }
 
-        return message{ value };
+        return { value };
     }
 };
 
@@ -3932,7 +3932,7 @@ struct abstract_wsum
                          values[i + PortNumber + PortNumber] * e * e;
         }
 
-        return message{ value };
+        return { value };
     }
 };
 
@@ -4256,7 +4256,7 @@ struct quantifier
 
     message observation(const time /*e*/) const noexcept
     {
-        return message(m_upthreshold, m_downthreshold);
+        return { m_upthreshold, m_downthreshold };
     }
 
 private:
@@ -4467,7 +4467,7 @@ struct adder
         for (size_t i = 0; i != PortNumber; ++i)
             ret += input_coeffs[i] * values[i];
 
-        return message(ret);
+        return { ret };
     }
 };
 
@@ -4545,7 +4545,7 @@ struct mult
         for (size_t i = 0; i != PortNumber; ++i)
             ret *= std::pow(values[i], input_coeffs[i]);
 
-        return message(ret);
+        return { ret };
     }
 };
 
@@ -4581,7 +4581,7 @@ struct counter
 
     message observation(const time /*e*/) const noexcept
     {
-        return message(static_cast<double>(number));
+        return { static_cast<double>(number) };
     }
 };
 
@@ -4626,7 +4626,7 @@ struct generator
 
     message observation(const time /*e*/) const noexcept
     {
-        return message(value);
+        return { value };
     }
 };
 
@@ -4669,7 +4669,7 @@ struct constant
 
     message observation(const time /*e*/) const noexcept
     {
-        return message(value);
+        return { value };
     }
 };
 
@@ -4733,7 +4733,7 @@ struct flow
 
     message observation(const time /*e*/) const noexcept
     {
-        return message(default_data[i]);
+        return { default_data[i] };
     }
 };
 
@@ -4876,7 +4876,7 @@ struct cross
 
     message observation(const time /*e*/) const noexcept
     {
-        return message(value, if_value, else_value);
+        return { value, if_value, else_value };
     }
 };
 
@@ -5117,7 +5117,7 @@ struct abstract_cross
 
     message observation(const time /*t*/) const noexcept
     {
-        return message(value[0], if_value[0], else_value[0]);
+        return { value[0], if_value[0], else_value[0] };
     }
 };
 
@@ -5184,7 +5184,7 @@ struct time_func
 
     message observation(const time /*t*/) const noexcept
     {
-        return message(value);
+        return { value };
     }
 };