generate_n.h 1.1 KB

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  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. #ifndef _LIBCPP___ALGORITHM_GENERATE_N_H
  9. #define _LIBCPP___ALGORITHM_GENERATE_N_H
  10. #include <__config>
  11. #include <__utility/convert_to_integral.h>
  12. #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  13. # pragma GCC system_header
  14. #endif
  15. _LIBCPP_BEGIN_NAMESPACE_STD
  16. template <class _OutputIterator, class _Size, class _Generator>
  17. inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
  18. generate_n(_OutputIterator __first, _Size __orig_n, _Generator __gen) {
  19. typedef decltype(std::__convert_to_integral(__orig_n)) _IntegralSize;
  20. _IntegralSize __n = __orig_n;
  21. for (; __n > 0; ++__first, (void)--__n)
  22. *__first = __gen();
  23. return __first;
  24. }
  25. _LIBCPP_END_NAMESPACE_STD
  26. #endif // _LIBCPP___ALGORITHM_GENERATE_N_H