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Fixed check if std::byte is available (#764)

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The check for std::byte existance fails on gcc 8.2. According to https://en.cppreference.com/w/cpp/utility/feature_test it is necessary to `#include <cstddef>` before checking `__cpp_lib_byte`.
This commit is contained in:
beinhaerter 2019-08-14 21:40:35 +02:00 committed by Anna Gringauze
parent 1212beae77
commit 1d48188de9
1 changed files with 1 additions and 1 deletions
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include/gsl/gsl_byte
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@ -56,6 +56,7 @@
#else // _MSC_VER #else // _MSC_VER
#ifndef GSL_USE_STD_BYTE #ifndef GSL_USE_STD_BYTE
#include <cstddef> /* __cpp_lib_byte */
// this tests if we are under GCC or Clang with enough -std:c++1z power to get us std::byte // this tests if we are under GCC or Clang with enough -std:c++1z power to get us std::byte
// also check if libc++ version is sufficient (> 5.0) or libstc++ actually contains std::byte // also check if libc++ version is sufficient (> 5.0) or libstc++ actually contains std::byte
#if defined(__cplusplus) && (__cplusplus >= 201703L) && \ #if defined(__cplusplus) && (__cplusplus >= 201703L) && \
@ -63,7 +64,6 @@
defined(_LIBCPP_VERSION) && (_LIBCPP_VERSION >= 5000)) defined(_LIBCPP_VERSION) && (_LIBCPP_VERSION >= 5000))
#define GSL_USE_STD_BYTE 1 #define GSL_USE_STD_BYTE 1
#include <cstddef>
#else // defined(__cplusplus) && (__cplusplus >= 201703L) && #else // defined(__cplusplus) && (__cplusplus >= 201703L) &&
// (defined(__cpp_lib_byte) && (__cpp_lib_byte >= 201603) || // (defined(__cpp_lib_byte) && (__cpp_lib_byte >= 201603) ||