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Only define __cpp_lib_constexpr_char_traits for C++17 

* include/bits/char_traits.h (__cpp_lib_constexpr_char_traits): Only
	define for C++17 and above.

From-SVN: r261634
This commit is contained in:
Jonathan Wakely 2018-06-15 16:47:56 +01:00 committed by Jonathan Wakely
parent 490cced415
commit 5a95794c58
2 changed files with 12 additions and 9 deletions
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3
libstdc++-v3/ChangeLog
View File

@ -1,5 +1,8 @@
2018-06-15 Jonathan Wakely <jwakely@redhat.com>
* include/bits/char_traits.h (__cpp_lib_constexpr_char_traits): Only
define for C++17 and above.
LWG 2993 reference_wrapper<T> conversion from T&&
* doc/xml/manual/intro.xml: Document LWG 2993 change.
* include/bits/refwrap.h (reference_wrapper(_Tp&)): Remove.

18
libstdc++-v3/include/bits/char_traits.h
View File

@ -143,8 +143,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ return !eq_int_type(__c, eof()) ? __c : to_int_type(char_type()); }
};
#define __cpp_lib_constexpr_char_traits 201611
template<typename _CharT>
_GLIBCXX14_CONSTEXPR int
char_traits<_CharT>::
@ -216,7 +214,9 @@ namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
#if __cplusplus > 201402
#if __cplusplus >= 201703L
#define __cpp_lib_constexpr_char_traits 201611
/**
* @brief Determine whether the characters of a NULL-terminated
* string are known at compile time.
@ -299,7 +299,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
static _GLIBCXX17_CONSTEXPR int
compare(const char_type* __s1, const char_type* __s2, size_t __n)
{
#if __cplusplus > 201402
#if __cplusplus >= 201703L
if (__builtin_constant_p(__n)
&& __constant_char_array_p(__s1, __n)
&& __constant_char_array_p(__s2, __n))
@ -313,7 +313,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
static _GLIBCXX17_CONSTEXPR size_t
length(const char_type* __s)
{
#if __cplusplus > 201402
#if __cplusplus >= 201703L
if (__constant_string_p(__s))
return __gnu_cxx::char_traits<char_type>::length(__s);
#endif
@ -323,7 +323,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
static _GLIBCXX17_CONSTEXPR const char_type*
find(const char_type* __s, size_t __n, const char_type& __a)
{
#if __cplusplus > 201402
#if __cplusplus >= 201703L
if (__builtin_constant_p(__n)
&& __builtin_constant_p(__a)
&& __constant_char_array_p(__s, __n))
@ -408,7 +408,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
static _GLIBCXX17_CONSTEXPR int
compare(const char_type* __s1, const char_type* __s2, size_t __n)
{
#if __cplusplus > 201402
#if __cplusplus >= 201703L
if (__builtin_constant_p(__n)
&& __constant_char_array_p(__s1, __n)
&& __constant_char_array_p(__s2, __n))
@ -423,7 +423,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
static _GLIBCXX17_CONSTEXPR size_t
length(const char_type* __s)
{
#if __cplusplus > 201402
#if __cplusplus >= 201703L
if (__constant_string_p(__s))
return __gnu_cxx::char_traits<char_type>::length(__s);
else
@ -434,7 +434,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
static _GLIBCXX17_CONSTEXPR const char_type*
find(const char_type* __s, size_t __n, const char_type& __a)
{
#if __cplusplus > 201402
#if __cplusplus >= 201703L
if (__builtin_constant_p(__n)
&& __builtin_constant_p(__a)
&& __constant_char_array_p(__s, __n))