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