| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| // std::views::split |
| |
| #include <ranges> |
| |
| #include <array> |
| #include <cassert> |
| #include <concepts> |
| #include <string_view> |
| #include <utility> |
| |
| #include "test_iterators.h" |
| |
| template <class View, class T> |
| concept CanBePiped = requires (View&& view, T&& t) { |
| { std::forward<View>(view) | std::forward<T>(t) }; |
| }; |
| |
| struct SomeView : std::ranges::view_base { |
| const std::string_view* v_; |
| constexpr SomeView(const std::string_view& v) : v_(&v) {} |
| constexpr auto begin() const { return v_->begin(); } |
| constexpr auto end() const { return v_->end(); } |
| }; |
| |
| struct NotAView { }; |
| |
| static_assert(!std::is_invocable_v<decltype(std::views::split)>); |
| static_assert(!std::is_invocable_v<decltype(std::views::split), SomeView, NotAView>); |
| static_assert(!std::is_invocable_v<decltype(std::views::split), NotAView, SomeView>); |
| static_assert( std::is_invocable_v<decltype(std::views::split), SomeView, SomeView>); |
| |
| static_assert( CanBePiped<SomeView&, decltype(std::views::split)>); |
| static_assert( CanBePiped<char(&)[10], decltype(std::views::split)>); |
| static_assert(!CanBePiped<char(&&)[10], decltype(std::views::split)>); |
| static_assert(!CanBePiped<NotAView, decltype(std::views::split)>); |
| |
| static_assert(std::same_as<decltype(std::views::split), decltype(std::ranges::views::split)>); |
| |
| constexpr bool test() { |
| std::string_view input = "abc"; |
| std::string_view sep = "a"; |
| |
| // Test that `std::views::split` is a range adaptor. |
| |
| // Test `views::split(input, sep)`. |
| { |
| SomeView view(input); |
| |
| using Result = std::ranges::split_view<SomeView, std::string_view>; |
| std::same_as<Result> decltype(auto) result = std::views::split(view, sep); |
| assert(result.base().begin() == input.begin()); |
| assert(result.base().end() == input.end()); |
| } |
| |
| // Test `views::split(sep)(input)`. |
| { |
| SomeView view(input); |
| |
| using Result = std::ranges::split_view<SomeView, std::string_view>; |
| std::same_as<Result> decltype(auto) result = std::views::split(sep)(view); |
| assert(result.base().begin() == input.begin()); |
| assert(result.base().end() == input.end()); |
| } |
| |
| // Test `view | views::split`. |
| { |
| SomeView view(input); |
| |
| using Result = std::ranges::split_view<SomeView, std::string_view>; |
| std::same_as<Result> decltype(auto) result = view | std::views::split(sep); |
| assert(result.base().begin() == input.begin()); |
| assert(result.base().end() == input.end()); |
| } |
| |
| // Test `adaptor | views::split`. |
| { |
| SomeView view(input); |
| auto f = [](char c) { return c; }; |
| auto partial = std::views::transform(f) | std::views::split(sep); |
| |
| using Result = std::ranges::split_view<std::ranges::transform_view<SomeView, decltype(f)>, std::string_view>; |
| std::same_as<Result> decltype(auto) result = partial(view); |
| assert(result.base().base().begin() == input.begin()); |
| assert(result.base().base().end() == input.end()); |
| } |
| |
| // Test `views::split | adaptor`. |
| { |
| SomeView view(input); |
| auto f = [](auto v) { return v; }; |
| auto partial = std::views::split(sep) | std::views::transform(f); |
| |
| using Result = std::ranges::transform_view<std::ranges::split_view<SomeView, std::string_view>, decltype(f)>; |
| std::same_as<Result> decltype(auto) result = partial(view); |
| assert(result.base().base().begin() == input.begin()); |
| assert(result.base().base().end() == input.end()); |
| } |
| |
| // Test that one can call `std::views::split` with arbitrary stuff, as long as we |
| // don't try to actually complete the call by passing it a range. |
| // |
| // That makes no sense and we can't do anything with the result, but it's valid. |
| { |
| struct X { }; |
| [[maybe_unused]] auto partial = std::views::split(X{}); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |