libcxx/include/__algorithm/ranges_replace_if.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_REPLACE_IF_H
  10 #define _LIBCPP___ALGORITHM_RANGES_REPLACE_IF_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 <__ranges/dangling.h>
  20 #include <__utility/move.h>
  21
  22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  23 #  pragma GCC system_header
  24 #endif
  25
  26 #if _LIBCPP_STD_VER >= 20
  27
  28 _LIBCPP_BEGIN_NAMESPACE_STD
  29
  30 namespace ranges {
  31
  32 template <class _Iter, class _Sent, class _Type, class _Proj, class _Pred>
  33 _LIBCPP_HIDE_FROM_ABI constexpr _Iter
  34 __replace_if_impl(_Iter __first, _Sent __last, _Pred& __pred, const _Type& __new_value, _Proj& __proj) {
  35   for (; __first != __last; ++__first) {
  36     if (std::invoke(__pred, std::invoke(__proj, *__first)))
  37       *__first = __new_value;
  38   }
  39   return __first;
  40 }
  41
  42 namespace __replace_if {
  43 struct __fn {
  44   template <input_iterator _Iter,
  45             sentinel_for<_Iter> _Sent,
  46             class _Type,
  47             class _Proj = identity,
  48             indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
  49     requires indirectly_writable<_Iter, const _Type&>
  50   _LIBCPP_HIDE_FROM_ABI constexpr _Iter
  51   operator()(_Iter __first, _Sent __last, _Pred __pred, const _Type& __new_value, _Proj __proj = {}) const {
  52     return ranges::__replace_if_impl(std::move(__first), std::move(__last), __pred, __new_value, __proj);
  53   }
  54
  55   template <input_range _Range,
  56             class _Type,
  57             class _Proj = identity,
  58             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
  59     requires indirectly_writable<iterator_t<_Range>, const _Type&>
  60   _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range>
  61   operator()(_Range&& __range, _Pred __pred, const _Type& __new_value, _Proj __proj = {}) const {
  62     return ranges::__replace_if_impl(ranges::begin(__range), ranges::end(__range), __pred, __new_value, __proj);
  63   }
  64 };
  65 } // namespace __replace_if
  66
  67 inline namespace __cpo {
  68 inline constexpr auto replace_if = __replace_if::__fn{};
  69 } // namespace __cpo
  70 } // namespace ranges
  71
  72 _LIBCPP_END_NAMESPACE_STD
  73
  74 #endif // _LIBCPP_STD_VER >= 20
  75
  76 #endif // _LIBCPP___ALGORITHM_RANGES_REPLACE_IF_H