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// Copyright (C) 2019-2022 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 <ranges>
#include <utility> // as_const
#include <testsuite_hooks.h>
void
test01()
{
std::ranges::single_view s{4};
static_assert(std::same_as<std::ranges::range_value_t<decltype(s)>, int>);
static_assert(std::ranges::size(s) == 1);
int count = 0;
for (auto i : s)
++count;
VERIFY(count == 1);
VERIFY(*std::ranges::begin(s) == 4);
}
void
test02()
{
std::ranges::single_view<long> s2;
static_assert(std::same_as<std::ranges::range_value_t<decltype(s2)>, long>);
static_assert(std::ranges::size(s2) == 1);
int count = 0;
for (auto l : s2)
++count;
VERIFY(count == 1);
VERIFY(*std::ranges::begin(s2) == 0L);
}
void
test03()
{
auto s3 = std::ranges::views::single('a');
static_assert(std::same_as<std::ranges::range_value_t<decltype(s3)>, char>);
static_assert(std::ranges::size(s3) == 1);
VERIFY(*std::ranges::begin(s3) == 'a');
}
void
test04()
{
// PR libstdc++/100475
struct A {
A() = default;
A(int, int) { }
A(std::initializer_list<int>) = delete;
void operator&() const = delete;
};
std::ranges::single_view<A> s(std::in_place, 0, 0);
s.data();
std::as_const(s).data();
}
void
test05()
{
int i = 0;
static_assert(noexcept(std::ranges::single_view<int>()));
static_assert(noexcept(std::ranges::single_view<int>(i)));
static_assert(noexcept(std::ranges::single_view<int>(1)));
static_assert(noexcept(std::ranges::single_view<int>(std::in_place, 2)));
static_assert(noexcept(std::ranges::views::single(i)));
auto s = std::ranges::views::single(i);
static_assert(noexcept(s.begin()));
static_assert(noexcept(s.end()));
static_assert(noexcept(s.size()));
static_assert(noexcept(s.data()));
static_assert(noexcept(s.empty())); // view_interface::empty()
const auto cs = s;
static_assert(noexcept(cs.begin()));
static_assert(noexcept(cs.end()));
static_assert(noexcept(cs.size()));
static_assert(noexcept(cs.data()));
static_assert(noexcept(cs.empty())); // view_interface::empty()
}
void
test06()
{
// PR libstdc++/100475 comment #7
struct S {
S() = default;
S(std::initializer_list<S>) = delete;
S(const S&) {}
};
S obj;
auto x = std::views::single(obj);
auto y = std::views::single(std::move(obj));
}
int main()
{
test01();
test02();
test03();
test04();
test05();
test06();
}
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