libcxx/include/__algorithm/ranges_any_of.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___ALGORITHM_RANGES_ANY_OF_H
  10 #define _LIBCPP___ALGORITHM_RANGES_ANY_OF_H
  11
  12 #include <__config>
  13 #include <__functional/identity.h>
  14 #include <__functional/invoke.h>
  15 #include <__iterator/concepts.h>
  16 #include <__iterator/projected.h>
  17 #include <__ranges/access.h>
  18 #include <__ranges/concepts.h>
  19 #include <__utility/move.h>
  20
  21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  22 #  pragma GCC system_header
  23 #endif
  24
  25 #if _LIBCPP_STD_VER >= 20
  26
  27 _LIBCPP_BEGIN_NAMESPACE_STD
  28
  29 namespace ranges {
  30 namespace __any_of {
  31 struct __fn {
  32   template <class _Iter, class _Sent, class _Proj, class _Pred>
  33   _LIBCPP_HIDE_FROM_ABI constexpr static bool __any_of_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) {
  34     for (; __first != __last; ++__first) {
  35       if (std::invoke(__pred, std::invoke(__proj, *__first)))
  36         return true;
  37     }
  38     return false;
  39   }
  40
  41   template <input_iterator _Iter,
  42             sentinel_for<_Iter> _Sent,
  43             class _Proj = identity,
  44             indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
  45   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool
  46   operator()(_Iter __first, _Sent __last, _Pred __pred = {}, _Proj __proj = {}) const {
  47     return __any_of_impl(std::move(__first), std::move(__last), __pred, __proj);
  48   }
  49
  50   template <input_range _Range,
  51             class _Proj = identity,
  52             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
  53   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool
  54   operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const {
  55     return __any_of_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
  56   }
  57 };
  58 } // namespace __any_of
  59
  60 inline namespace __cpo {
  61 inline constexpr auto any_of = __any_of::__fn{};
  62 } // namespace __cpo
  63 } // namespace ranges
  64
  65 _LIBCPP_END_NAMESPACE_STD
  66
  67 #endif // _LIBCPP_STD_VER >= 20
  68
  69 #endif // _LIBCPP___ALGORITHM_RANGES_ANY_OF_H