libcxx/include/__algorithm/generate_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_GENERATE_N_H
  10 #define _LIBCPP___ALGORITHM_GENERATE_N_H
  11
  12 #include <__config>
  13 #include <__utility/convert_to_integral.h>
  14
  15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  16 #  pragma GCC system_header
  17 #endif
  18
  19 _LIBCPP_BEGIN_NAMESPACE_STD
  20
  21 template <class _OutputIterator, class _Size, class _Generator>
  22 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
  23 _OutputIterator
  24 generate_n(_OutputIterator __first, _Size __orig_n, _Generator __gen)
  25 {
  26     typedef decltype(_VSTD::__convert_to_integral(__orig_n)) _IntegralSize;
  27     _IntegralSize __n = __orig_n;
  28     for (; __n > 0; ++__first, (void) --__n)
  29         *__first = __gen();
  30     return __first;
  31 }
  32
  33 _LIBCPP_END_NAMESPACE_STD
  34
  35 #endif // _LIBCPP___ALGORITHM_GENERATE_N_H