| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| // std::views::common |
| |
| #include <ranges> |
| |
| #include <array> |
| #include <cassert> |
| #include <concepts> |
| #include <utility> |
| |
| #include "test_iterators.h" |
| #include "types.h" |
| |
| template <class View, class T> |
| concept CanBePiped = requires (View&& view, T&& t) { |
| { std::forward<View>(view) | std::forward<T>(t) }; |
| }; |
| |
| constexpr bool test() { |
| int buf[] = {1, 2, 3}; |
| |
| // views::common(r) is equivalent to views::all(r) if r is a common_range |
| { |
| { |
| CommonView view(buf, buf + 3); |
| std::same_as<CommonView> auto result = std::views::common(view); |
| assert(result.begin_ == buf); |
| assert(result.end_ == buf + 3); |
| } |
| { |
| using NotAView = std::array<int, 3>; |
| NotAView arr = {1, 2, 3}; |
| std::same_as<std::ranges::ref_view<NotAView>> auto result = std::views::common(arr); |
| assert(result.begin() == arr.begin()); |
| assert(result.end() == arr.end()); |
| } |
| } |
| |
| // Otherwise, views::common(r) is equivalent to ranges::common_view{r} |
| { |
| NonCommonView view(buf, buf + 3); |
| std::same_as<std::ranges::common_view<NonCommonView>> auto result = std::views::common(view); |
| assert(result.base().begin_ == buf); |
| assert(result.base().end_ == buf + 3); |
| } |
| |
| // Test that std::views::common is a range adaptor |
| { |
| using SomeView = NonCommonView; |
| |
| // Test `v | views::common` |
| { |
| SomeView view(buf, buf + 3); |
| std::same_as<std::ranges::common_view<SomeView>> auto result = view | std::views::common; |
| assert(result.base().begin_ == buf); |
| assert(result.base().end_ == buf + 3); |
| } |
| |
| // Test `adaptor | views::common` |
| { |
| SomeView view(buf, buf + 3); |
| auto f = [](int i) { return i; }; |
| auto const partial = std::views::transform(f) | std::views::common; |
| using Result = std::ranges::common_view<std::ranges::transform_view<SomeView, decltype(f)>>; |
| std::same_as<Result> auto result = partial(view); |
| assert(result.base().base().begin_ == buf); |
| assert(result.base().base().end_ == buf + 3); |
| } |
| |
| // Test `views::common | adaptor` |
| { |
| SomeView view(buf, buf + 3); |
| auto f = [](int i) { return i; }; |
| auto const partial = std::views::common | std::views::transform(f); |
| using Result = std::ranges::transform_view<std::ranges::common_view<SomeView>, decltype(f)>; |
| std::same_as<Result> auto result = partial(view); |
| assert(result.base().base().begin_ == buf); |
| assert(result.base().base().end_ == buf + 3); |
| } |
| |
| // Check SFINAE friendliness |
| { |
| struct NotAView { }; |
| static_assert(!std::is_invocable_v<decltype(std::views::common)>); |
| static_assert(!std::is_invocable_v<decltype(std::views::common), NotAView>); |
| static_assert( CanBePiped<SomeView&, decltype(std::views::common)>); |
| static_assert( CanBePiped<int(&)[10], decltype(std::views::common)>); |
| static_assert(!CanBePiped<int(&&)[10], decltype(std::views::common)>); |
| static_assert(!CanBePiped<NotAView, decltype(std::views::common)>); |
| } |
| } |
| |
| { |
| static_assert(std::same_as<decltype(std::views::common), decltype(std::ranges::views::common)>); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |