FunctionRef: Rework it to make it compile on Clang on Windows

Try to bypass "error: cannot compile this forwarded non-trivially copyable parameter yet"

Author: SirLynix

include/NazaraUtils/FunctionRef.hpp

@@ -35,6 +35,8 @@ namespace Nz
 			FunctionRef& operator=(FunctionRef&&) noexcept = default;
 
 		private:
+			template<typename Functor> static Ret Call(void* functor, Args... args);
+
 			using Callback = Ret(*)(void* functor, Args...);
 
 			Callback m_callback;

include/NazaraUtils/FunctionRef.inl

@@ -19,10 +19,7 @@ namespace Nz
 	FunctionRef<Ret(Args...)>::FunctionRef(F&& f) noexcept
 	{
 		m_functor = reinterpret_cast<void*>(std::addressof(f));
-		m_callback = [](void* functor, Args... args) -> Ret
-		{
-			return std::invoke(*reinterpret_cast<decltype(std::addressof(f))>(functor), std::forward<Args>(args)...);
-		};
+		m_callback = &Call<decltype(std::addressof(f))>;
 	}
 
 	template<typename Ret, typename... Args>
@@ -37,4 +34,11 @@ namespace Nz
 	{
 		return m_functor != nullptr;
 	}
+
+	template<typename Ret, typename... Args>
+	template<typename Functor>
+	Ret FunctionRef<Ret(Args...)>::Call(void* functor, Args... args)
+	{
+		return std::invoke(*reinterpret_cast<Functor>(functor), std::forward<Args>(args)...);
+	}
 }