67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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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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// UNSUPPORTED: libcpp-has-no-incomplete-ranges
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// std::views::single
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#include <ranges>
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#include <cassert>
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#include <concepts>
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#include <utility>
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#include "MoveOnly.h"
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// Can't invoke without arguments.
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static_assert(!std::is_invocable_v<decltype((std::views::single))>);
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// Can't invoke with a move-only type.
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static_assert(!std::is_invocable_v<decltype((std::views::single)), MoveOnly>);
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constexpr bool test() {
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// Lvalue.
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{
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int x = 42;
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std::same_as<std::ranges::single_view<int>> decltype(auto) v = std::views::single(x);
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assert(v.size() == 1);
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assert(v.front() == x);
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}
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// Prvalue.
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{
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std::same_as<std::ranges::single_view<int>> decltype(auto) v = std::views::single(42);
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assert(v.size() == 1);
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assert(v.front() == 42);
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}
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// Const lvalue.
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{
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const int x = 42;
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std::same_as<std::ranges::single_view<int>> decltype(auto) v = std::views::single(x);
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assert(v.size() == 1);
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assert(v.front() == x);
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}
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// Xvalue.
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{
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int x = 42;
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std::same_as<std::ranges::single_view<int>> decltype(auto) v = std::views::single(std::move(x));
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assert(v.size() == 1);
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assert(v.front() == x);
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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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