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libstdc++: Add comparison operators to types from Numerics clause

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Some more C++20 changes from P1614R2, "The Mothership has Landed".

	* include/bits/slice_array.h (operator==(const slice&, const slice&)):
	Define for C++20.
	* include/std/complex (operator==(const T&, const complex<T>&))
	(operator!=(const complex<T>&, const complex<T>&))
	(operator!=(const complex<T>&, const T&))
	(operator!=(const T&, const complex<T>&)): Do not declare for C++20.
	* testsuite/26_numerics/slice/compare.cc: New test.
This commit is contained in:
Jonathan Wakely 2020-04-08 16:51:59 +01:00
parent e4b84abcc4
commit ef389dadd4
4 changed files with 63 additions and 0 deletions
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8
libstdc++-v3/ChangeLog
View file

@ -1,5 +1,13 @@
2020-04-08 Jonathan Wakely <jwakely@redhat.com>
* include/bits/slice_array.h (operator==(const slice&, const slice&)):
Define for C++20.
* include/std/complex (operator==(const T&, const complex<T>&))
(operator!=(const complex<T>&, const complex<T>&))
(operator!=(const complex<T>&, const T&))
(operator!=(const T&, const complex<T>&)): Do not declare for C++20.
* testsuite/26_numerics/slice/compare.cc: New test.
* include/std/charconv (to_chars_result, from_chars_result): Add
defaulted equality comparisons for C++20.
* testsuite/20_util/from_chars/compare.cc: New test.

5
libstdc++-v3/include/bits/slice_array.h
View file

@ -78,6 +78,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
/// Return array stride of slice.
size_t stride() const;
#if __cpp_impl_three_way_comparison >= 201907L
/// Equality comparison
friend bool operator==(const slice&, const slice&) = default;
#endif
private:
size_t _M_off; // offset
size_t _M_sz; // size

2
libstdc++-v3/include/std/complex
View file

@ -468,6 +468,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
operator==(const complex<_Tp>& __x, const _Tp& __y)
{ return __x.real() == __y && __x.imag() == _Tp(); }
#if !(__cpp_impl_three_way_comparison >= 201907L)
template<typename _Tp>
inline _GLIBCXX_CONSTEXPR bool
operator==(const _Tp& __x, const complex<_Tp>& __y)
@ -490,6 +491,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
inline _GLIBCXX_CONSTEXPR bool
operator!=(const _Tp& __x, const complex<_Tp>& __y)
{ return __x != __y.real() || _Tp() != __y.imag(); }
#endif
//@}
/// Extraction operator for complex values.

48
libstdc++-v3/testsuite/26_numerics/slice/compare.cc Normal file
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@ -0,0 +1,48 @@
// Copyright (C) 2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }
#include <valarray>
#include <testsuite_hooks.h>
void
test01()
{
std::slice s1(1, 2, 3);
VERIFY( s1 == s1 );
VERIFY( !(s1 != s1) );
std::slice s2(1, 2, 3);
VERIFY( s2 == s1 );
VERIFY( !(s2 != s1) );
std::slice s3(3, 2, 3);
VERIFY( s3 != s1 );
VERIFY( !(s3 == s1) );
std::slice s4(1, 3, 3);
VERIFY( s4 != s1 );
VERIFY( !(s4 == s1) );
std::slice s5(1, 2, 4);
VERIFY( s5 != s1 );
VERIFY( !(s5 == s1) );
}
int
main()
{
test01();
}