-struct is_class
-{
- // is_class<> metafunction due to Paul Mensonides (leavings@attbi.com). For
- // more details:
- // http://groups.google.com/groups?hl=en&selm=000001c1cc83%24e154d5e0%247772e50c%40c161550a&rnum=1
- public:
- enum { value = sizeof(char) == sizeof(dont_use::is_class_helper<T>(0)) };
+struct isPodLike {
+ // std::is_trivially_copyable is available in libc++ with clang, libstdc++
+ // that comes with GCC 5.
+#if (__has_feature(is_trivially_copyable) && defined(_LIBCPP_VERSION)) || \
+ (defined(__GNUC__) && __GNUC__ >= 5)
+ // If the compiler supports the is_trivially_copyable trait use it, as it
+ // matches the definition of isPodLike closely.
+ static const bool value = std::is_trivially_copyable<T>::value;
+#elif __has_feature(is_trivially_copyable)
+ // Use the internal name if the compiler supports is_trivially_copyable but we
+ // don't know if the standard library does. This is the case for clang in
+ // conjunction with libstdc++ from GCC 4.x.
+ static const bool value = __is_trivially_copyable(T);
+#else
+ // If we don't know anything else, we can (at least) assume that all non-class
+ // types are PODs.
+ static const bool value = !std::is_class<T>::value;
+#endif