'FuncUtils' module: fixed bug when the redirector was NOT working cor…

…rectly when some params should be pass to the targeted func.

FuncUtils.h

@@ -1,18 +1,30 @@
 #ifndef FuncUtilsH
 #define FuncUtilsH
 
-#include <utility> // for 'std::move', 'std::forward'
+//// [!] Version 1.01 [!]
 
+#include <utility>     // for 'std::move', 'std::forward'
+#include <type_traits> // for 'std::is_same'
+
+//// A functor (Function Object) CAN also be possibly used as a 'ProcName' OR 'FuncName'
 #define EXEC_MEMBER_PROC_IF_PRESENT(ProcName) namespace ProcName {\
   void ExecIfPresent(...) throw() {}\
   \
   template <class C, typename... TArgs>\
-  void ExecIfPresent(C& obj, TArgs&... args) {\
-    obj.ProcName(std::forward<TArgs>(args)...);\
+  auto ExecIfPresent(C& obj, TArgs&&... args)\
+    /*Remove prototype from the overload resolution if such a callable (func./functor) is NOT exist*/\
+    -> decltype(obj.ProcName(std::forward<TArgs>(args)...))\
+  {\
+    static_assert(std::is_same<void,\
+                               typename decltype(obj.ProcName(std::forward<TArgs>(args)...))>::value,\
+                  "'EXEC_MEMBER_PROC_IF_PRESENT' SHOULD be used with the procedures,"\
+                  " which returns nothing (void)");\
+    obj.ProcName(std::forward<TArgs>(args)...); /*MS VS is OK with the 'return void'*/\
   }\
 };
 
-// If NOT exists - returns the 'DefaultValue', which SHOULD be the same type as a decltype(*.FuncName())
+// If NOT exists - returns the 'DefaultValue',
+//  which SHOULD be the same type as a decltype(*.FuncName())
 // Works with static/const/virtual funcs
 #define EXEC_MEMBER_FUNC_IF_PRESENT(FuncName, DefaultValue) namespace FuncName {\
   template <typename TReturnType = decltype(DefaultValue)>\
@@ -21,8 +33,9 @@
   }\
   \
   template <class C, typename... TArgs>\
-  auto ExecIfPresent(C& obj, TArgs&... args)\
-   -> decltype(obj.FuncName(std::forward<TArgs>(args)...)) /* do NOT use 'const C& obj' NOR 'C::FuncName()'*/\
+  auto ExecIfPresent(C& obj, TArgs&&... args)\
+    /*Remove prototype from the overload resolution if such a callable (func./functor) is NOT exist*/\
+    -> decltype(obj.FuncName(std::forward<TArgs>(args)...)) /*NOT 'const C& obj' NOR 'C::FuncName()'*/\
   {\
     return std::move(obj.FuncName(std::forward<TArgs>(args)...));\
   }\