//===----------------------------------------------------------------------===//
//
// 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

// template<class R>
// concept input_range;

#include <ranges>

#include "test_iterators.h"
#include "test_range.h"

static_assert(std::ranges::input_range<test_range<cpp17_input_iterator> >);
static_assert(std::ranges::input_range<test_range<cpp17_input_iterator> const>);

static_assert(std::ranges::input_range<test_range<cpp20_input_iterator> >);
static_assert(std::ranges::input_range<test_range<cpp20_input_iterator> const>);

static_assert(std::ranges::input_range<test_non_const_range<cpp17_input_iterator> >);
static_assert(std::ranges::input_range<test_non_const_range<cpp20_input_iterator> >);

static_assert(!std::ranges::input_range<test_non_const_range<cpp17_input_iterator> const>);
static_assert(!std::ranges::input_range<test_non_const_range<cpp20_input_iterator> const>);

static_assert(std::ranges::input_range<test_common_range<forward_iterator> >);
static_assert(!std::ranges::input_range<test_common_range<cpp20_input_iterator> >);

static_assert(std::ranges::input_range<test_common_range<forward_iterator> const>);
static_assert(!std::ranges::input_range<test_common_range<cpp20_input_iterator> const>);

static_assert(std::ranges::input_range<test_non_const_common_range<forward_iterator> >);
static_assert(!std::ranges::input_range<test_non_const_common_range<cpp20_input_iterator> >);

static_assert(!std::ranges::input_range<test_non_const_common_range<forward_iterator> const>);
static_assert(!std::ranges::input_range<test_non_const_common_range<cpp20_input_iterator> const>);

// Test ADL-proofing.
struct Incomplete;
template<class T> struct Holder { T t; };

static_assert(!std::ranges::input_range<Holder<Incomplete>*>);
static_assert(!std::ranges::input_range<Holder<Incomplete>*&>);
static_assert(!std::ranges::input_range<Holder<Incomplete>*&&>);
static_assert(!std::ranges::input_range<Holder<Incomplete>* const>);
static_assert(!std::ranges::input_range<Holder<Incomplete>* const&>);
static_assert(!std::ranges::input_range<Holder<Incomplete>* const&&>);

static_assert( std::ranges::input_range<Holder<Incomplete>*[10]>);
static_assert( std::ranges::input_range<Holder<Incomplete>*(&)[10]>);
static_assert( std::ranges::input_range<Holder<Incomplete>*(&&)[10]>);
static_assert( std::ranges::input_range<Holder<Incomplete>* const[10]>);
static_assert( std::ranges::input_range<Holder<Incomplete>* const(&)[10]>);
static_assert( std::ranges::input_range<Holder<Incomplete>* const(&&)[10]>);