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// Copyright (C) 2019 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 <iterator>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
struct R1
{
int i = 0;
int j = 0;
constexpr const int* rbegin() const { return &i; }
constexpr const int* rend() const { return &i + 1; }
friend constexpr const int* rbegin(const R1&& r) { return &r.j; }
friend constexpr const int* rend(const R1&& r) { return &r.j + 1; }
};
void
test01()
{
R1 r;
const R1& c = r;
VERIFY( std::ranges::crend(r) == std::ranges::rend(c) );
VERIFY( std::ranges::crend(std::move(r)) == std::ranges::rend(std::move(c)) );
VERIFY( std::ranges::crend(c) == std::ranges::rend(c) );
VERIFY( std::ranges::crend(std::move(c)) == std::ranges::rend(std::move(c)) );
}
struct R2
{
int a[2] = { };
long l[2] = { };
const int* begin() const { return a; }
const int* end() const { return a + 2; }
friend const long* begin(const R2&& r) { return r.l; }
friend const long* end(const R2&& r) { return r.l + 2; }
};
void
test02()
{
R2 r;
const R2& c = r;
VERIFY( std::ranges::crend(r) == std::ranges::rend(c) );
VERIFY( std::ranges::crend(std::move(r)) == std::ranges::rend(std::move(c)) );
VERIFY( std::ranges::crend(c) == std::ranges::rend(c) );
VERIFY( std::ranges::crend(std::move(c)) == std::ranges::rend(std::move(c)) );
}
struct R3
{
int i = 0;
const int* rbegin() const noexcept { return &i + 1; }
const long* rend() const noexcept { return nullptr; } // not a sentinel for rbegin()
friend const long* rbegin(const R3&) noexcept { return nullptr; }
friend const int* rend(const R3& r) { return &r.i; }
};
void
test03()
{
R3 r;
const R3& c = r;
VERIFY( std::ranges::crend(r) == std::ranges::rend(c) );
static_assert( !noexcept(std::ranges::crend(r)) );
VERIFY( std::ranges::crend(c) == std::ranges::rend(c) );
static_assert( !noexcept(std::ranges::crend(c)) );
}
void
test04()
{
int a[2] = { };
const auto& c = a;
VERIFY( std::ranges::crend(a) == std::ranges::rend(c) );
VERIFY( std::ranges::crend(c) == std::ranges::rend(c) );
}
int
main()
{
test01();
test02();
test03();
test04();
}
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