239236b8c2
This moves the definition of a `pair` constructor for `<tuple>` to `<__utility/pair.h>` and uses the forward declaration of `pair` in `<tuple>` instead of including the definition.
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// template<different-from<subrange> PairLike>
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// requires pair-like-convertible-from<PairLike, const I&, const S&>
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// constexpr operator PairLike() const;
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#include <array>
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#include <cassert>
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#include <concepts>
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#include <ranges>
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#include <utility>
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#include "test_macros.h"
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static_assert(std::convertible_to<std::ranges::subrange<int*>, std::pair<int*, int*>>);
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static_assert(std::convertible_to<std::ranges::subrange<int*>, std::tuple<int*, int*>>);
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static_assert(!std::convertible_to<std::ranges::subrange<int*>, std::pair<long*, int*>>);
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static_assert(!std::convertible_to<std::ranges::subrange<int*>, std::pair<int*, long*>>);
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static_assert(!std::convertible_to<std::ranges::subrange<int*>, std::pair<long*, long*>>);
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static_assert(!std::convertible_to<std::ranges::subrange<int*>, std::array<int*, 2>>);
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constexpr bool test() {
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// Check to std::pair
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{
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int data[] = {1, 2, 3, 4, 5};
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const std::ranges::subrange a(data);
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{
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std::pair<int*, int*> p(a);
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assert(p.first == data + 0);
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assert(p.second == data + 5);
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}
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{
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std::pair<int*, int*> p{a};
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assert(p.first == data + 0);
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assert(p.second == data + 5);
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}
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{
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std::pair<int*, int*> p = a;
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assert(p.first == data + 0);
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assert(p.second == data + 5);
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}
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}
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// Check to std::tuple
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{
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int data[] = {1, 2, 3, 4, 5};
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const std::ranges::subrange a(data);
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{
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std::tuple<int*, int*> p(a);
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assert(std::get<0>(p) == data + 0);
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assert(std::get<1>(p) == data + 5);
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}
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{
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std::tuple<int*, int*> p{a};
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assert(std::get<0>(p) == data + 0);
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assert(std::get<1>(p) == data + 5);
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}
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{
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std::tuple<int*, int*> p = a;
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assert(std::get<0>(p) == data + 0);
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assert(std::get<1>(p) == data + 5);
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}
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}
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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