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Add __may_alias__ attribute to gsl::byte (#668)

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C++17 defines `std::byte*` to have the same aliasing properties as
`char*`. Hence, we mark it with the `__may_alias__` attribute under gcc
and clang.

Based on the fix by Martin Moene in byte-lite.

Fixes #663
This commit is contained in:
Stephan Dollberg 2018-05-01 20:32:31 +01:00 committed by Anna Gringauze
parent c4c1f6395a
commit d6b26b367b
1 changed files with 8 additions and 1 deletions
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9
include/gsl/gsl_byte
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@ -57,6 +57,13 @@
#endif // _MSC_VER #endif // _MSC_VER
// Use __may_alias__ attribute on gcc and clang
#if defined __clang__ || (__GNUC__ > 5)
#define byte_may_alias __attribute__((__may_alias__))
#else // defined __clang__ || defined __GNUC__
#define byte_may_alias
#endif // defined __clang__ || defined __GNUC__
namespace gsl namespace gsl
{ {
#if GSL_USE_STD_BYTE #if GSL_USE_STD_BYTE
@ -69,7 +76,7 @@ using std::to_integer;
// This is a simple definition for now that allows // This is a simple definition for now that allows
// use of byte within span<> to be standards-compliant // use of byte within span<> to be standards-compliant
enum class byte : unsigned char enum class byte_may_alias byte : unsigned char
{ {
}; };