Revert "Core/Algorithm: Fix Apply problems"

This reverts commit 9a8c807d18.

ChangeLog.md

@@ -75,7 +75,6 @@ Nazara Engine:
 - ⚠️ Renamed Bitset::Read to Bitset::Write
 - Fixed ENetCompressor class destructor not being virtual
 - ⚠️ Added a type tag parameter to Serialize and Unserialize functions, to prevent implicit conversions with overloads
-- Fixed Apply functions with complex return types
 
 Nazara Development Kit:
 - Added ImageWidget (#139)

include/Nazara/Core/Algorithm.inl

@@ -21,13 +21,13 @@ namespace Nz
 	{
 		// http://www.cppsamples.com/common-tasks/apply-tuple-to-function.html
 		template<typename F, typename Tuple, size_t... S>
-		auto ApplyImplFunc(F&& fn, Tuple&& t, std::index_sequence<S...>)
+		decltype(auto) ApplyImplFunc(F&& fn, Tuple&& t, std::index_sequence<S...>)
 		{
 			return std::forward<F>(fn)(std::get<S>(std::forward<Tuple>(t))...);
 		}
 
 		template<typename O, typename F, typename Tuple, size_t... S>
-		auto ApplyImplMethod(O& object, F&& fn, Tuple&& t, std::index_sequence<S...>)
+		decltype(auto) ApplyImplMethod(O& object, F&& fn, Tuple&& t, std::index_sequence<S...>)
 		{
 			return (object .* std::forward<F>(fn))(std::get<S>(std::forward<Tuple>(t))...);
 		}