libcxx/include/__algorithm/transform.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_TRANSFORM_H
  10 #define _LIBCPP___ALGORITHM_TRANSFORM_H
  11
  12 #include <__config>
  13
  14 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  15 #  pragma GCC system_header
  16 #endif
  17
  18 _LIBCPP_BEGIN_NAMESPACE_STD
  19
  20 template <class _InputIterator, class _OutputIterator, class _UnaryOperation>
  21 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
  22 _OutputIterator
  23 transform(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _UnaryOperation __op)
  24 {
  25     for (; __first != __last; ++__first, (void) ++__result)
  26         *__result = __op(*__first);
  27     return __result;
  28 }
  29
  30 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _BinaryOperation>
  31 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
  32 _OutputIterator
  33 transform(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2,
  34           _OutputIterator __result, _BinaryOperation __binary_op)
  35 {
  36     for (; __first1 != __last1; ++__first1, (void) ++__first2, ++__result)
  37         *__result = __binary_op(*__first1, *__first2);
  38     return __result;
  39 }
  40
  41 _LIBCPP_END_NAMESPACE_STD
  42
  43 #endif // _LIBCPP___ALGORITHM_TRANSFORM_H