97 lines
4.0 KiB
C++
97 lines
4.0 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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// class std::ranges::subrange;
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#include <ranges>
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#include <cassert>
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#include "test_macros.h"
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#include "test_iterators.h"
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template<size_t I, class S>
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concept HasGet = requires {
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std::get<I>(std::declval<S>());
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};
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static_assert( HasGet<0, std::ranges::subrange<int*>>);
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static_assert( HasGet<1, std::ranges::subrange<int*>>);
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static_assert(!HasGet<2, std::ranges::subrange<int*>>);
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static_assert(!HasGet<3, std::ranges::subrange<int*>>);
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constexpr bool test() {
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{
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using It = int*;
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using Sent = sentinel_wrapper<int*>;
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int a[] = {1, 2, 3};
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using R = std::ranges::subrange<It, Sent, std::ranges::subrange_kind::unsized>;
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R r = R(It(a), Sent(It(a + 3)));
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ASSERT_SAME_TYPE(decltype(std::get<0>(r)), It);
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ASSERT_SAME_TYPE(decltype(std::get<1>(r)), Sent);
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ASSERT_SAME_TYPE(decltype(std::get<0>(static_cast<R&&>(r))), It);
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ASSERT_SAME_TYPE(decltype(std::get<1>(static_cast<R&&>(r))), Sent);
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ASSERT_SAME_TYPE(decltype(std::get<0>(static_cast<const R&>(r))), It);
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ASSERT_SAME_TYPE(decltype(std::get<1>(static_cast<const R&>(r))), Sent);
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ASSERT_SAME_TYPE(decltype(std::get<0>(static_cast<const R&&>(r))), It);
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ASSERT_SAME_TYPE(decltype(std::get<1>(static_cast<const R&&>(r))), Sent);
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assert(base(std::get<0>(r)) == a); // copy from It
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assert(base(base(std::get<1>(r))) == a + 3); // copy from Sent
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assert(base(std::get<0>(std::move(r))) == a); // copy from It
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assert(base(base(std::get<1>(std::move(r)))) == a + 3); // copy from Sent
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}
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{
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using It = int*;
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using Sent = sentinel_wrapper<int*>;
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int a[] = {1, 2, 3};
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using R = std::ranges::subrange<It, Sent, std::ranges::subrange_kind::sized>;
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R r = R(It(a), Sent(It(a + 3)), 3);
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ASSERT_SAME_TYPE(decltype(std::get<0>(r)), It);
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ASSERT_SAME_TYPE(decltype(std::get<1>(r)), Sent);
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ASSERT_SAME_TYPE(decltype(std::get<0>(static_cast<R&&>(r))), It);
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ASSERT_SAME_TYPE(decltype(std::get<1>(static_cast<R&&>(r))), Sent);
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ASSERT_SAME_TYPE(decltype(std::get<0>(static_cast<const R&>(r))), It);
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ASSERT_SAME_TYPE(decltype(std::get<1>(static_cast<const R&>(r))), Sent);
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ASSERT_SAME_TYPE(decltype(std::get<0>(static_cast<const R&&>(r))), It);
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ASSERT_SAME_TYPE(decltype(std::get<1>(static_cast<const R&&>(r))), Sent);
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assert(base(std::get<0>(r)) == a); // copy from It
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assert(base(base(std::get<1>(r))) == a + 3); // copy from Sent
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assert(base(std::get<0>(std::move(r))) == a); // copy from It
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assert(base(base(std::get<1>(std::move(r)))) == a + 3); // copy from Sent
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}
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{
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// Test the fix for LWG 3589.
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using It = cpp20_input_iterator<int*>;
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using Sent = sentinel_wrapper<It>;
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int a[] = {1, 2, 3};
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using R = std::ranges::subrange<It, Sent>;
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R r = R(It(a), Sent(It(a + 3)));
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static_assert(!HasGet<0, R&>);
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ASSERT_SAME_TYPE(decltype(std::get<1>(r)), Sent);
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ASSERT_SAME_TYPE(decltype(std::get<0>(static_cast<R&&>(r))), It);
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ASSERT_SAME_TYPE(decltype(std::get<1>(static_cast<R&&>(r))), Sent);
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static_assert(!HasGet<0, const R&>);
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ASSERT_SAME_TYPE(decltype(std::get<1>(static_cast<const R&>(r))), Sent);
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static_assert(!HasGet<0, const R&&>);
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ASSERT_SAME_TYPE(decltype(std::get<1>(static_cast<const R&&>(r))), Sent);
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assert(base(base(std::get<1>(r))) == a + 3); // copy from Sent
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assert(base(std::get<0>(std::move(r))) == a); // move from It
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assert(base(base(std::get<1>(std::move(r)))) == a + 3); // copy from Sent
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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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