cbe03646c6
The changes are nearly pure simplifications, so I think it's OK to do them together in the same PR. Actual test coverages were already added in commit ad41d1e26b12 (https://reviews.llvm.org/D141216). Thanks to Casey Carter! Fixes #104975 Towards #105200
77 lines
2.5 KiB
C++
77 lines
2.5 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, c++20
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// std::views::zip
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#include <ranges>
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#include <array>
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#include <cassert>
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#include <tuple>
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#include <type_traits>
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#include <utility>
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#include "types.h"
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static_assert(std::is_invocable_v<decltype((std::views::zip))>);
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static_assert(!std::is_invocable_v<decltype((std::views::zip)), int>);
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static_assert(std::is_invocable_v<decltype((std::views::zip)), SizedRandomAccessView>);
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static_assert(
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std::is_invocable_v<decltype((std::views::zip)), SizedRandomAccessView, std::ranges::iota_view<int, int>>);
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static_assert(!std::is_invocable_v<decltype((std::views::zip)), SizedRandomAccessView, int>);
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constexpr bool test() {
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{
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// zip zero arguments
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auto v = std::views::zip();
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assert(std::ranges::empty(v));
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static_assert(std::is_same_v<decltype(v), std::ranges::empty_view<std::tuple<>>>);
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}
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{
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// zip a view
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int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
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std::same_as<std::ranges::zip_view<SizedRandomAccessView>> decltype(auto) v =
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std::views::zip(SizedRandomAccessView{buffer});
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assert(std::ranges::size(v) == 8);
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static_assert(std::is_same_v<std::ranges::range_reference_t<decltype(v)>, std::tuple<int&>>);
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}
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{
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// zip a viewable range
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std::array a{1, 2, 3};
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std::same_as<std::ranges::zip_view<std::ranges::ref_view<std::array<int, 3>>>> decltype(auto) v =
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std::views::zip(a);
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assert(&(std::get<0>(*v.begin())) == &(a[0]));
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static_assert(std::is_same_v<std::ranges::range_reference_t<decltype(v)>, std::tuple<int&>>);
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}
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{
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// zip the zip_view
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int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
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std::same_as<std::ranges::zip_view<SizedRandomAccessView, SizedRandomAccessView>> decltype(auto) v =
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std::views::zip(SizedRandomAccessView{buffer}, SizedRandomAccessView{buffer});
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std::same_as<
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std::ranges::zip_view<std::ranges::zip_view<SizedRandomAccessView, SizedRandomAccessView>>> decltype(auto) v2 =
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std::views::zip(v);
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static_assert(std::is_same_v<std::ranges::range_reference_t<decltype(v2)>, std::tuple<std::tuple<int&, int&>>>);
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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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