remove stdex::is_detected and stdex::void_t

headers/enduro2d/base/stdex.hpp

@@ -8,48 +8,6 @@
 
 #include "macros.hpp"
 
-//
-// void_t
-//
-
-namespace e2d { namespace stdex
-{
-    namespace impl
-    {
-        template < typename... Args >
-        struct make_void {
-            using type = void;
-        };
-    }
-
-    template < typename... Args >
-    using void_t = typename impl::make_void<Args...>::type;
-}}
-
-//
-// is_detected
-//
-
-namespace e2d { namespace stdex
-{
-    namespace impl
-    {
-        template < template <typename...> class Op
-                , typename AlwaysVoid
-                , typename... Args >
-        struct is_detected
-        : std::false_type {};
-
-        template < template <typename...> class Op
-                 , typename... Args >
-        struct is_detected<Op, stdex::void_t<Op<Args...>>, Args...>
-        : std::true_type {};
-    }
-
-    template < template <typename...> class Op, typename... Args >
-    using is_detected = typename impl::is_detected<Op, void, Args...>::type;
-}}
-
 //
 // basic_string_view
 //

headers/enduro2d/utils/json_utils.hpp

@@ -118,16 +118,7 @@ namespace e2d { namespace json_utils
 namespace e2d { namespace json_utils
 {
     template < typename T >
-    using has_try_parse_value = decltype(
+    bool try_parse_value(const rapidjson::Value& root, vector<T>& v) {
-        try_parse_value(
-            std::declval<const rapidjson::Value&>(),
-            std::declval<T&>()));
-
-    template < typename T >
-    std::enable_if_t<
-        stdex::is_detected<json_utils::has_try_parse_value, T>::value,
-        bool>
-    try_parse_value(const rapidjson::Value& root, vector<T>& v) {
         if ( !root.IsArray() ) {
             return false;
         }