xref: /llvm-project/libcxx/include/__algorithm/ranges_starts_with.h (revision d10dc5a06fac4dcabf2264c64c8672c6f6ae36fb)

//===----------------------------------------------------------------------===//
//
// 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 _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H
#define _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H

#include <__algorithm/in_in_result.h>
#include <__algorithm/ranges_mismatch.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/ranges_operations.h>
#include <__iterator/concepts.h>
#include <__iterator/indirectly_comparable.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__utility/move.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

#if _LIBCPP_STD_VER >= 23

_LIBCPP_BEGIN_NAMESPACE_STD

namespace ranges {
struct __starts_with {
  template <input_iterator _Iter1,
            sentinel_for<_Iter1> _Sent1,
            input_iterator _Iter2,
            sentinel_for<_Iter2> _Sent2,
            class _Pred  = ranges::equal_to,
            class _Proj1 = identity,
            class _Proj2 = identity>
    requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI static constexpr bool operator()(
      _Iter1 __first1,
      _Sent1 __last1,
      _Iter2 __first2,
      _Sent2 __last2,
      _Pred __pred   = {},
      _Proj1 __proj1 = {},
      _Proj2 __proj2 = {}) {
    return __mismatch::__go(
               std::move(__first1),
               std::move(__last1),
               std::move(__first2),
               std::move(__last2),
               __pred,
               __proj1,
               __proj2)
               .in2 == __last2;
  }

  template <input_range _Range1,
            input_range _Range2,
            class _Pred  = ranges::equal_to,
            class _Proj1 = identity,
            class _Proj2 = identity>
    requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI static constexpr bool
  operator()(_Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) {
    return __mismatch::__go(
               ranges::begin(__range1),
               ranges::end(__range1),
               ranges::begin(__range2),
               ranges::end(__range2),
               __pred,
               __proj1,
               __proj2)
               .in2 == ranges::end(__range2);
  }
};
inline namespace __cpo {
inline constexpr auto starts_with = __starts_with{};
} // namespace __cpo
} // namespace ranges

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_STD_VER >= 23

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H