Improve LINE_F code

include/PSX/Auxiliary/type_traits.hpp

@@ -9,6 +9,50 @@ namespace JabyEngine {
     struct enable_if<true, T> {
         typedef T type;
     };
+
+    // #############################################
+
+    template<class T, class U>
+    struct is_same {
+        static constexpr bool value = false;
+    };
+ 
+    template<class T>
+    struct is_same<T, T> {
+        static constexpr bool value = true;
+    };
+
+    // #############################################
+
+    template<bool B, class T, class F>
+    struct conditional { 
+        using type = T; 
+    };
+ 
+    template<class T, class F>
+    struct conditional<false, T, F> { 
+        using type = F; 
+    };
+
+    // #############################################
+
+    template<class...> 
+    struct conjunction {
+        static constexpr bool value = true;
+    };
+
+    template<class B1> 
+    struct conjunction<B1> : B1 {
+    };
+
+    template<class B1, class... Bn>
+    struct conjunction<B1, Bn...> : conditional<bool(B1::value), conjunction<Bn...>, B1>::type {
+    };
+
+    // #############################################
+
+    template<typename T, typename... Ts>
+    using variadic_force_same = enable_if<conjunction<is_same<T, Ts>...>::value>::type;
 }
 
 #endif //! __JABYENGINE_TYPE_TRAITS_HPP__