| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // UNSUPPORTED: libcpp-no-concepts |
| // UNSUPPORTED: libcpp-has-no-incomplete-ranges |
| |
| // constexpr T const& operator*() const; |
| // constexpr T& operator*(); |
| |
| #include <ranges> |
| |
| #include <cassert> |
| |
| template <class T> |
| constexpr void test() { |
| using Cache = std::ranges::__non_propagating_cache<T>; |
| |
| // non-const version |
| { |
| Cache cache; cache.__emplace(3); |
| T& result = *cache; |
| assert(result == T{3}); |
| } |
| |
| // const version |
| { |
| Cache cache; cache.__emplace(3); |
| T const& result = *static_cast<Cache const&>(cache); |
| assert(result == T{3}); |
| } |
| } |
| |
| struct T { |
| int x; |
| constexpr explicit T(int i) : x(i) { } |
| constexpr bool operator==(T const& other) const { return x == other.x; } |
| }; |
| |
| constexpr bool tests() { |
| test<T>(); |
| test<int>(); |
| return true; |
| } |
| |
| int main(int, char**) { |
| static_assert(tests()); |
| tests(); |
| return 0; |
| } |