libcxx/include/__cxx03/__algorithm/ranges_for_each.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_FOR_EACH_H
  10 #define _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H
  11
  12 #include <__cxx03/__algorithm/in_fun_result.h>
  13 #include <__cxx03/__config>
  14 #include <__cxx03/__functional/identity.h>
  15 #include <__cxx03/__functional/invoke.h>
  16 #include <__cxx03/__iterator/concepts.h>
  17 #include <__cxx03/__iterator/projected.h>
  18 #include <__cxx03/__ranges/access.h>
  19 #include <__cxx03/__ranges/concepts.h>
  20 #include <__cxx03/__ranges/dangling.h>
  21 #include <__cxx03/__utility/move.h>
  22
  23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  24 #  pragma GCC system_header
  25 #endif
  26
  27 _LIBCPP_PUSH_MACROS
  28 #include <__cxx03/__undef_macros>
  29
  30 #if _LIBCPP_STD_VER >= 20
  31
  32 _LIBCPP_BEGIN_NAMESPACE_STD
  33
  34 namespace ranges {
  35
  36 template <class _Iter, class _Func>
  37 using for_each_result = in_fun_result<_Iter, _Func>;
  38
  39 namespace __for_each {
  40 struct __fn {
  41 private:
  42   template <class _Iter, class _Sent, class _Proj, class _Func>
  43   _LIBCPP_HIDE_FROM_ABI constexpr static for_each_result<_Iter, _Func>
  44   __for_each_impl(_Iter __first, _Sent __last, _Func& __func, _Proj& __proj) {
  45     for (; __first != __last; ++__first)
  46       std::invoke(__func, std::invoke(__proj, *__first));
  47     return {std::move(__first), std::move(__func)};
  48   }
  49
  50 public:
  51   template <input_iterator _Iter,
  52             sentinel_for<_Iter> _Sent,
  53             class _Proj = identity,
  54             indirectly_unary_invocable<projected<_Iter, _Proj>> _Func>
  55   _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<_Iter, _Func>
  56   operator()(_Iter __first, _Sent __last, _Func __func, _Proj __proj = {}) const {
  57     return __for_each_impl(std::move(__first), std::move(__last), __func, __proj);
  58   }
  59
  60   template <input_range _Range,
  61             class _Proj = identity,
  62             indirectly_unary_invocable<projected<iterator_t<_Range>, _Proj>> _Func>
  63   _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<borrowed_iterator_t<_Range>, _Func>
  64   operator()(_Range&& __range, _Func __func, _Proj __proj = {}) const {
  65     return __for_each_impl(ranges::begin(__range), ranges::end(__range), __func, __proj);
  66   }
  67 };
  68 } // namespace __for_each
  69
  70 inline namespace __cpo {
  71 inline constexpr auto for_each = __for_each::__fn{};
  72 } // namespace __cpo
  73 } // namespace ranges
  74
  75 _LIBCPP_END_NAMESPACE_STD
  76
  77 #endif // _LIBCPP_STD_VER >= 20
  78
  79 _LIBCPP_POP_MACROS
  80
  81 #endif // _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H