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Base isPodLike on is_trivially_copyable for GCC 5 and MSVC

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It would be nice to get rid of the version checks here, but that will
have to wait until libstdc++ is upgraded to 5.0 everywhere ...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230021 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2015-02-20 16:19:28 +00:00
parent 3e00ca983c
commit 1b740e2667
1 changed files with 9 additions and 1 deletions
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10
include/llvm/Support/type_traits.h
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@ -28,9 +28,17 @@ namespace llvm {
/// type can be copied around with memcpy instead of running ctors etc.
template <typename T>
struct isPodLike {
#if __has_feature(is_trivially_copyable)
// std::is_trivially copyable is available in libc++ with clang, libstdc++
// that comes with GCC 5 and MSVC 2013.
#if (__has_feature(is_trivially_copyable) && defined(_LIBCPP_VERSION)) || \
(defined(__GNUC__) && __GNUC__ >= 5) || defined(_MSC_VER)
// 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