core: update message structure

This patch change the size of real array from 3 to 4 doubles. This patch
remove the length attribute. Now the size computed from the no-zero
value.

lib/include/irritator/core.hpp

@@ -617,46 +617,60 @@ struct message
     using size_type = std::size_t;
     using difference_type = std::ptrdiff_t;
 
-    double real[3];
-    i8 length;
+    double real[4];
 
-    constexpr std::size_t size() const noexcept
+    constexpr size_type size() const noexcept
+    {
+        return real[3] ? 4u : real[2] ? 3u : real[1] ? 2u : real[0] ? 1u : 0u;
+    }
+
+    constexpr difference_type ssize() const noexcept
     {
-        irt_assert(length >= 0);
-        return static_cast<std::size_t>(length);
+        return real[3] ? 4 : real[2] ? 3 : real[1] ? 2 : real[0] ? 1 : 0;
     }
 
     constexpr message() noexcept
-      : real{ 0.0, 0.0, 0.0 }
-      , length{ 0 }
+      : real{ 0., 0., 0., 0. }
     {}
 
     constexpr message(const double v) noexcept
-      : real{ v, 0., 0. }
-      , length{ 1 }
+      : real{ v, 0., 0., 0. }
     {}
 
     constexpr message(const double v1, const double v2) noexcept
-      : real{ v1, v2, 0. }
-      , length{ 2 }
+      : real{ v1, v2, 0., 0. }
     {}
 
     constexpr message(const double v1,
                       const double v2,
                       const double v3) noexcept
-      : real{ v1, v2, v3 }
-      , length{ 3 }
+      : real{ v1, v2, v3, 0. }
+    {}
+
+    constexpr message(const double v1,
+                      const double v2,
+                      const double v3,
+                      const double v4) noexcept
+      : real{ v1, v2, v3, v4 }
     {}
 
-    double operator[](const difference_type i) const noexcept
+    constexpr double operator[](const difference_type i) const noexcept
     {
         return real[i];
     }
 
-    double& operator[](const difference_type i) noexcept
+    constexpr double& operator[](const difference_type i) noexcept
     {
         return real[i];
     }
+
+    constexpr void reset() noexcept
+    {
+        real[0] = 0.;
+        real[1] = 0.;
+        real[2] = 0.;
+        real[3] = 0.;
+    }
 };
 
 /*****************************************************************************

lib/test/public-api.cpp

@@ -544,10 +544,12 @@ main()
     "message"_test = [] {
         {
             irt::message vdouble;
-            expect(vdouble.real[0] == 0.0);
-            expect(vdouble.real[1] == 0.0);
-            expect(vdouble.real[2] == 0.0);
+            expect(vdouble[0] == 0.0);
+            expect(vdouble[1] == 0.0);
+            expect(vdouble[2] == 0.0);
+            expect(vdouble[3] == 0.0);
             expect(vdouble.size() == 0_ul);
+            expect(vdouble.ssize() == 0);
         }
 
         {
@@ -555,7 +557,9 @@ main()
             expect(vdouble[0] == 1.0);
             expect(vdouble[1] == 0.0);
             expect(vdouble[2] == 0.0);
+            expect(vdouble[3] == 0.0);
             expect(vdouble.size() == 1_ul);
+            expect(vdouble.ssize() == 1);
         }
 
         {
@@ -563,15 +567,29 @@ main()
             expect(vdouble[0] == 0.0);
             expect(vdouble[1] == 1.0);
             expect(vdouble[2] == 0.0);
+            expect(vdouble[3] == 0.0);
             expect(vdouble.size() == 2_ul);
+            expect(vdouble.ssize() == 2);
         }
 
         {
-            irt::message vdouble(1.0, 2.0, 3.0);
-            expect(vdouble[0] == 1.0);
-            expect(vdouble[1] == 2.0);
-            expect(vdouble[2] == 3.0);
+            irt::message vdouble(0.0, 0.0, 1.0);
+            expect(vdouble[0] == 0.0);
+            expect(vdouble[1] == 0.0);
+            expect(vdouble[2] == 1.0);
+            expect(vdouble[3] == 0.0);
             expect(vdouble.size() == 3_ul);
+            expect(vdouble.ssize() == 3);
+        }
+
+        {
+            irt::message vdouble(0.0, 0.0, 0.0, 1.0);
+            expect(vdouble[0] == 0.0);
+            expect(vdouble[1] == 0.0);
+            expect(vdouble[2] == 0.0);
+            expect(vdouble[3] == 1.0);
+            expect(vdouble.size() == 4_ul);
+            expect(vdouble.ssize() == 4);
         }
     };