From b68625ca7a2ce49030bdfb1c774905c91f24a3b8 Mon Sep 17 00:00:00 2001
From: terik23 <neargye@gmail.com>
Date: Sun, 14 Apr 2019 18:16:24 +0500
Subject: [PATCH] add check type

---
 include/nameof.hpp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/include/nameof.hpp b/include/nameof.hpp
index 231590d..3a5fa08 100644
--- a/include/nameof.hpp
+++ b/include/nameof.hpp
@@ -143,6 +143,14 @@ template <typename E, typename U = std::underlying_type_t<E>>
   }
 }
 
+template <typename T>
+struct check final {
+  using type = void;
+};
+
+template <typename T>
+using check_t = typename check<T>::type;
+
 template <typename T>
 [[nodiscard]] constexpr std::string_view nameof_impl(std::string_view name, bool with_template_suffix) noexcept {
   if (name.length() >= 1 && (name.front() == '"' || name.front() == '\'')) {
@@ -245,13 +253,13 @@ template <typename T>
 } // namespace nameof
 
 // NAMEOF obtains simple (unqualified) string name of variable, function, enum, macro.
-#define NAMEOF(...) ::nameof::detail::nameof_impl<decltype(__VA_ARGS__)>(#__VA_ARGS__, false)
+#define NAMEOF(...) ::nameof::detail::nameof_impl<::nameof::detail::check_t<decltype(__VA_ARGS__)>>(#__VA_ARGS__, false)
 
 // Obtains simple (unqualified) full (with template suffix) string name of variable, function, enum, macro.
-#define NAMEOF_FULL(...) ::nameof::detail::nameof_impl<decltype(__VA_ARGS__)>(#__VA_ARGS__, true)
+#define NAMEOF_FULL(...) ::nameof::detail::nameof_impl<::nameof::detail::check_t<decltype(__VA_ARGS__)>>(#__VA_ARGS__, true)
 
 // Obtains raw string name of variable, function, enum, macro.
-#define NAMEOF_RAW(...) ::nameof::detail::nameof_raw_impl<decltype(__VA_ARGS__)>(#__VA_ARGS__)
+#define NAMEOF_RAW(...) ::nameof::detail::nameof_raw_impl<::nameof::detail::check_t<decltype(__VA_ARGS__)>>(#__VA_ARGS__)
 
 // Obtains simple (unqualified) string enum name of enum variable.
 #define NAMEOF_ENUM(...) ::nameof::nameof_enum<decltype(__VA_ARGS__)>(__VA_ARGS__)