David Blaikie suggested this test for detecting constexpr on the error_category default constructor. Additionally I decided to make this constructor trivial as well, as I could not come up with a rationale for not doing so. Fully tested with both current Apple clang and tip-of-trunk clang.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@189034 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/system_error b/include/system_error
index df668cc..afc73f2 100644
--- a/include/system_error
+++ b/include/system_error
@@ -370,7 +370,8 @@
#ifdef _LIBCPP_BUILDING_SYSTEM_ERROR
error_category() _NOEXCEPT;
#else
- _LIBCPP_ALWAYS_INLINE _LIBCPP_CONSTEXPR_AFTER_CXX11 error_category() _NOEXCEPT {}
+ _LIBCPP_ALWAYS_INLINE
+ _LIBCPP_CONSTEXPR_AFTER_CXX11 error_category() _NOEXCEPT = default;
#endif
private:
error_category(const error_category&);// = delete;