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