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Implement std::ranges::less without std::less 

* include/bits/range_cmp.h (ranges::less::operator()): Inline the
	logic from std::less::operator() to remove the dependency on it.

From-SVN: r277150
This commit is contained in:
Jonathan Wakely 2019-10-18 12:27:26 +01:00 committed by Jonathan Wakely
parent bec3c279a8
commit 7e4b7d7bac
2 changed files with 17 additions and 3 deletions
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5
libstdc++-v3/ChangeLog
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@ -1,3 +1,8 @@
2019-10-18 Jonathan Wakely <jwakely@redhat.com>
* include/bits/range_cmp.h (ranges::less::operator()): Inline the
logic from std::less::operator() to remove the dependency on it.
2019-10-17 Jonathan Wakely <jwakely@redhat.com>
* doc/doxygen/user.cfg.in (INPUT): Add new C++17 and C++20 headers.

15
libstdc++-v3/include/bits/range_cmp.h
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@ -121,10 +121,19 @@ namespace ranges
noexcept(noexcept(std::declval<_Tp>() < std::declval<_Up>()))
{
if constexpr (__detail::__less_builtin_ptr_cmp<_Tp, _Up>)
return std::less<const volatile void*>{}(
static_cast<const volatile void*>(std::forward<_Tp>(__t)),
{
#ifdef __cpp_lib_is_constant_evaluated
if (std::is_constant_evaluated())
return __t < __u;
#endif
auto __x = reinterpret_cast<__UINTPTR_TYPE__>(
static_cast<const volatile void*>(std::forward<_Tp>(__t)));
auto __y = reinterpret_cast<__UINTPTR_TYPE__>(
static_cast<const volatile void*>(std::forward<_Up>(__u)));
return std::forward<_Tp>(__t) < std::forward<_Up>(__u);
return __x < __y;
}
else
return std::forward<_Tp>(__t) < std::forward<_Up>(__u);
}
using is_transparent = __is_transparent;