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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// template <class I1, class I2>
// struct min_max_result;
#include <algorithm>
#include <cassert>
#include <type_traits>
#include "MoveOnly.h"
struct A {
explicit A(int);
};
// no implicit conversion
static_assert(!std::is_constructible_v<std::ranges::min_max_result<A>, std::ranges::min_max_result<int>>);
struct B {
B(int);
};
// implicit conversion
static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, std::ranges::min_max_result<int>>);
static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, std::ranges::min_max_result<int>&>);
static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, const std::ranges::min_max_result<int>>);
static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, const std::ranges::min_max_result<int>&>);
struct C {
C(int&);
};
static_assert(!std::is_constructible_v<std::ranges::min_max_result<C>, std::ranges::min_max_result<int>&>);
// has to be convertible via const&
static_assert(std::is_convertible_v<std::ranges::min_max_result<int>&, std::ranges::min_max_result<long>>);
static_assert(std::is_convertible_v<const std::ranges::min_max_result<int>&, std::ranges::min_max_result<long>>);
static_assert(std::is_convertible_v<std::ranges::min_max_result<int>&&, std::ranges::min_max_result<long>>);
static_assert(std::is_convertible_v<const std::ranges::min_max_result<int>&&, std::ranges::min_max_result<long>>);
// should be move constructible
static_assert(std::is_move_constructible_v<std::ranges::min_max_result<MoveOnly>>);
// should not be copy constructible
static_assert(!std::is_copy_constructible_v<std::ranges::min_max_result<MoveOnly>>);
struct NotConvertible {};
// conversions should not work if there is no conversion
static_assert(!std::is_convertible_v<std::ranges::min_max_result<NotConvertible>, std::ranges::min_max_result<int>>);
template <class T>
struct ConvertibleFrom {
constexpr ConvertibleFrom(T c) : content{c} {}
T content;
};
constexpr bool test() {
// Checks that conversion operations are correct.
{
std::ranges::min_max_result<double> res{10, 1};
assert(res.min == 10);
assert(res.max == 1);
std::ranges::min_max_result<ConvertibleFrom<int>> res2 = res;
assert(res2.min.content == 10);
assert(res2.max.content == 1);
}
// Checks that conversions are possible when one of the types is move-only.
{
std::ranges::min_max_result<MoveOnly> res{MoveOnly{}, MoveOnly{}};
assert(res.min.get() == 1);
assert(res.max.get() == 1);
auto res2 = std::move(res);
assert(res.min.get() == 0);
assert(res.max.get() == 0);
assert(res2.min.get() == 1);
assert(res2.max.get() == 1);
}
// Checks that structured bindings get the correct values.
{
auto [min, max] = std::ranges::min_max_result<int>{1, 2};
assert(min == 1);
assert(max == 2);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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