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Merge #14031: Make IS_TRIVIALLY_CONSTRUCTIBLE consistent on GCC < 5, don't patch clang

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f1640d093f Make IS_TRIVIALLY_CONSTRUCTIBLE consistent on GCC < 5 (Ben Woosley)

Pull request description:

  `std::is_trivially_constructible<T>` is equivalent to `std::is_trivially_default_constructible<T>`
  `std::has_trivial_default_constructor<T>` is the GCC < 5 name for `std::is_trivially_default_constructible<T>`

  https://en.cppreference.com/w/cpp/types/is_default_constructible
  https://www.gnu.org/software/gcc/gcc-5/changes.html

  `std::is_trivial` was also used when compiling with clang, due to clang's use of `__GNUC__`. Test `__clang__`  to target the intended implementations.
  https://stackoverflow.com/a/28166605

  All callers currently only pass one template argument to IS_TRIVIALLY_CONSTRUCTIBLE, with this change the build would fail if someone attempted passing more.

Tree-SHA512: 3e36ddf20a1c0d76ad94d7c95f3fe5b90f4ee00389d5516b35c657136205e7a3ddff60789b0b0b2375624631f15a51eaad3570ef19a7b9df1469a50ba28415d1
This commit is contained in:
Wladimir J. van der Laan 2018-08-27 11:59:42 +02:00
commit cb98effc5c
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1 changed files with 3 additions and 3 deletions
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6
src/compat.h
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@ -14,10 +14,10 @@
// GCC 4.8 is missing some C++11 type_traits,
// https://www.gnu.org/software/gcc/gcc-5/changes.html
#if defined(__GNUC__) && __GNUC__ < 5
#define IS_TRIVIALLY_CONSTRUCTIBLE std::is_trivial
#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ < 5
#define IS_TRIVIALLY_CONSTRUCTIBLE std::has_trivial_default_constructor
#else
#define IS_TRIVIALLY_CONSTRUCTIBLE std::is_trivially_constructible
#define IS_TRIVIALLY_CONSTRUCTIBLE std::is_trivially_default_constructible
#endif
#ifdef WIN32