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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
//
//===----------------------------------------------------------------------===//
#ifndef LIBCXX_TEST_SUPPORT_TEST_RANGE_H
#define LIBCXX_TEST_SUPPORT_TEST_RANGE_H
#include <concepts>
#include <functional>
#include <iterator>
#include <ranges>
#include <type_traits>
#include "test_iterators.h"
#if TEST_STD_VER < 17
# error "test/support/test_range.h" can only be included in builds supporting ranges
#endif
struct sentinel {
bool operator==(std::input_or_output_iterator auto const&) const;
};
template <template <class...> class I, class T = int>
requires std::input_or_output_iterator<I<T*> >
struct test_range {
I<T*> begin();
I<T const*> begin() const;
sentinel end();
sentinel end() const;
};
template <template <class...> class I, class T = int>
requires std::input_or_output_iterator<I<T*> >
struct test_non_const_range {
I<T*> begin();
sentinel end();
};
template <template <class...> class I, class T = int>
requires std::input_or_output_iterator<I<T*> >
struct test_common_range {
I<T*> begin();
I<T const*> begin() const;
I<T*> end();
I<T const*> end() const;
};
template <template <class...> class I, class T = int>
requires std::input_or_output_iterator<I<T*> >
struct test_non_const_common_range {
I<T*> begin();
I<T*> end();
};
template <template <class...> class I, class T = int>
requires std::input_or_output_iterator<I<T*> >
struct test_view : std::ranges::view_base {
I<T*> begin();
I<T const*> begin() const;
sentinel end();
sentinel end() const;
};
template <class T = int>
struct BorrowedRange {
T* begin() const;
T* end() const;
BorrowedRange(BorrowedRange&&) = delete;
};
template <class T>
inline constexpr bool std::ranges::enable_borrowed_range<BorrowedRange<T>> = true;
static_assert(!std::ranges::view<BorrowedRange<>>);
static_assert(std::ranges::borrowed_range<BorrowedRange<>>);
using BorrowedView = std::ranges::empty_view<int>;
static_assert(std::ranges::view<BorrowedView>);
static_assert(std::ranges::borrowed_range<BorrowedView>);
using NonBorrowedView = std::ranges::single_view<int>;
static_assert(std::ranges::view<NonBorrowedView>);
static_assert(!std::ranges::borrowed_range<NonBorrowedView>);
template <class Range>
concept simple_view =
std::ranges::view<Range> && std::ranges::range<const Range> &&
std::same_as<std::ranges::iterator_t<Range>, std::ranges::iterator_t<const Range>> &&
std::same_as<std::ranges::sentinel_t<Range>, std::ranges::sentinel_t<const Range>>;
template <class View, class T>
concept CanBePiped = requires(View&& view, T&& t) {
{ std::forward<View>(view) | std::forward<T>(t) };
};
// See [concept.equalitycomparable]
template <class T, class U>
concept weakly_equality_comparable_with =
requires(const std::remove_reference_t<T>& t, const std::remove_reference_t<U>& u) {
{ t == u } -> std::same_as<bool>;
{ t != u } -> std::same_as<bool>;
{ u == t } -> std::same_as<bool>;
{ u != t } -> std::same_as<bool>;
};
#endif // LIBCXX_TEST_SUPPORT_TEST_RANGE_H
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