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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
// UNSUPPORTED: libcpp-no-concepts
// UNSUPPORTED: gcc-10
// projected
#include <iterator>
#include <concepts>
#include <functional>
#include "test_iterators.h"
using IntPtr = std::projected<int const*, std::identity>;
static_assert(std::same_as<IntPtr::value_type, int>);
static_assert(std::same_as<decltype(*std::declval<IntPtr>()), int const&>);
static_assert(std::same_as<std::iter_difference_t<IntPtr>, std::ptrdiff_t>);
struct S { };
using Cpp17InputIterator = std::projected<cpp17_input_iterator<S*>, int S::*>;
static_assert(std::same_as<Cpp17InputIterator::value_type, int>);
static_assert(std::same_as<decltype(*std::declval<Cpp17InputIterator>()), int&>);
static_assert(std::same_as<std::iter_difference_t<Cpp17InputIterator>, std::ptrdiff_t>);
using Cpp20InputIterator = std::projected<cpp20_input_iterator<S*>, int S::*>;
static_assert(std::same_as<Cpp20InputIterator::value_type, int>);
static_assert(std::same_as<decltype(*std::declval<Cpp20InputIterator>()), int&>);
static_assert(std::same_as<std::iter_difference_t<Cpp20InputIterator>, std::ptrdiff_t>);
using ForwardIterator = std::projected<forward_iterator<S*>, int (S::*)()>;
static_assert(std::same_as<ForwardIterator::value_type, int>);
static_assert(std::same_as<decltype(*std::declval<ForwardIterator>()), int>);
static_assert(std::same_as<std::iter_difference_t<ForwardIterator>, std::ptrdiff_t>);
using BidirectionalIterator = std::projected<bidirectional_iterator<S*>, S* (S::*)() const>;
static_assert(std::same_as<BidirectionalIterator::value_type, S*>);
static_assert(std::same_as<decltype(*std::declval<BidirectionalIterator>()), S*>);
static_assert(std::same_as<std::iter_difference_t<BidirectionalIterator>, std::ptrdiff_t>);
using RandomAccessIterator = std::projected<random_access_iterator<S*>, S && (S::*)()>;
static_assert(std::same_as<RandomAccessIterator::value_type, S>);
static_assert(std::same_as<decltype(*std::declval<RandomAccessIterator>()), S&&>);
static_assert(std::same_as<std::iter_difference_t<RandomAccessIterator>, std::ptrdiff_t>);
using ContiguousIterator = std::projected<contiguous_iterator<S*>, S& (S::*)() const>;
static_assert(std::same_as<ContiguousIterator::value_type, S>);
static_assert(std::same_as<decltype(*std::declval<ContiguousIterator>()), S&>);
static_assert(std::same_as<std::iter_difference_t<ContiguousIterator>, std::ptrdiff_t>);
template <class I, class F>
constexpr bool projectable = requires {
typename std::projected<I, F>;
};
static_assert(!projectable<int, void (*)(int)>); // int isn't indirectly_readable
static_assert(!projectable<S, void (*)(int)>); // S isn't weakly_incrementable
static_assert(!projectable<int*, void(int)>); // void(int) doesn't satisfy indirectly_regular_unary_invcable
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