enable_if

include/spdlog/logger.h

@@ -74,8 +74,7 @@ public:
     void swap(spdlog::logger &other) SPDLOG_NOEXCEPT;
 
     // FormatString is a type derived from fmt::compile_string
-    template<typename FormatString, typename std::enable_if<fmt::is_compile_string<FormatString>::value, int>::type * = nullptr,
-        typename... Args>
+    template<typename FormatString, typename std::enable_if<fmt::is_compile_string<FormatString>::value, int>::type = 0, typename... Args>
     void log(source_loc loc, level::level_enum lvl, const FormatString &fmt, const Args &... args)
     {
         log_(loc, lvl, fmt, args...);
@@ -137,9 +136,8 @@ public:
     }
 
     // T can be statically converted to string_view and isn't a fmt::compile_string
-    template<class T,
-        typename std::enable_if<std::is_convertible<const T &, spdlog::string_view_t>::value && !fmt::is_compile_string<T>::value, T>::type
-            * = nullptr>
+    template<class T, typename std::enable_if<
+                          std::is_convertible<const T &, spdlog::string_view_t>::value && !fmt::is_compile_string<T>::value, int>::type = 0>
     void log(source_loc loc, level::level_enum lvl, const T &msg)
     {
         log(loc, lvl, string_view_t{msg});
@@ -179,7 +177,7 @@ public:
     // T cannot be statically converted to string_view or wstring_view
     template<class T, typename std::enable_if<!std::is_convertible<const T &, spdlog::string_view_t>::value &&
                                                   !is_convertible_to_wstring_view<const T &>::value,
-                          T>::type * = nullptr>
+                          int>::type = 0>
     void log(source_loc loc, level::level_enum lvl, const T &msg)
     {
         log(loc, lvl, "{}", msg);
@@ -250,7 +248,7 @@ public:
     }
 
     // T can be statically converted to wstring_view
-    template<class T, typename std::enable_if<is_convertible_to_wstring_view<const T &>::value, T>::type * = nullptr>
+    template<class T, typename std::enable_if<is_convertible_to_wstring_view<const T &>::value, int>::type = 0>
     void log(source_loc loc, level::level_enum lvl, const T &msg)
     {
         bool log_enabled = should_log(lvl);