libcxx/include/__algorithm/fill_n.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_FILL_N_H
  10 #define _LIBCPP___ALGORITHM_FILL_N_H
  11
  12 #include <__config>
  13 #include <__iterator/iterator_traits.h>
  14 #include <__utility/convert_to_integral.h>
  15
  16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  17 #  pragma GCC system_header
  18 #endif
  19
  20 _LIBCPP_BEGIN_NAMESPACE_STD
  21
  22 // fill_n isn't specialized for std::memset, because the compiler already optimizes the loop to a call to std::memset.
  23
  24 template <class _OutputIterator, class _Size, class _Tp>
  25 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
  26 _OutputIterator
  27 __fill_n(_OutputIterator __first, _Size __n, const _Tp& __value)
  28 {
  29     for (; __n > 0; ++__first, (void) --__n)
  30         *__first = __value;
  31     return __first;
  32 }
  33
  34 template <class _OutputIterator, class _Size, class _Tp>
  35 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
  36 _OutputIterator
  37 fill_n(_OutputIterator __first, _Size __n, const _Tp& __value)
  38 {
  39    return _VSTD::__fill_n(__first, _VSTD::__convert_to_integral(__n), __value);
  40 }
  41
  42 _LIBCPP_END_NAMESPACE_STD
  43
  44 #endif // _LIBCPP___ALGORITHM_FILL_N_H