diff options
| -rw-r--r-- | llvm/include/llvm/Support/type_traits.h | 22 |
1 files changed, 9 insertions, 13 deletions
diff --git a/llvm/include/llvm/Support/type_traits.h b/llvm/include/llvm/Support/type_traits.h index 468dc6ce440..88385c3fae1 100644 --- a/llvm/include/llvm/Support/type_traits.h +++ b/llvm/include/llvm/Support/type_traits.h @@ -24,11 +24,12 @@ namespace llvm { -/// Type trait used to determine whether a given type can be copied around with -/// memcpy instead of running ctors. -template <typename T> struct isPodLike { -// std::is_trivially_copyable is available in libc++ with clang, libstdc++ -// that comes with GCC 5. +/// isPodLike - This is a type trait that is used to determine whether a given +/// type can be copied around with memcpy instead of running ctors etc. +template <typename T> +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 @@ -39,15 +40,10 @@ template <typename T> struct isPodLike { // 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); -#elif defined(__GNUC__) - // Fallback to ye olden compiler intrinsic, which isn't as accurate as the new - // one but more widely supported. - static const bool value = __has_trivial_copy(T); #else - // If we really don't know anything else is_pod will do, is widely supported, - // but is too strict (e.g. a user-defined ctor doesn't prevent trivial copy - // but prevents POD-ness). - static const bool value = std::is_pod<T>::value; + // 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 }; |
