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112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
// -*- C++ -*-
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//
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// Copyright (C) 2010-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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/** @file profile/impl/profiler_algos.h
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* @brief Algorithms used by the profile extension.
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*
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* This file is needed to avoid including \<algorithm\> or \<bits/stl_algo.h\>.
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* Including those files would result in recursive includes.
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* These implementations are oversimplified. In general, efficiency may be
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* sacrificed to minimize maintenance overhead.
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*/
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#ifndef _GLIBCXX_PROFILE_PROFILER_ALGOS_H
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#define _GLIBCXX_PROFILE_PROFILER_ALGOS_H 1
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namespace __gnu_profile
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{
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/* Helper for __top_n. Insert in sorted vector, but not beyond Nth elem. */
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template<typename _Container>
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void
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__insert_top_n(_Container& __output,
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const typename _Container::value_type& __value,
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typename _Container::size_type __n)
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{
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typename _Container::iterator __it = __output.begin();
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typename _Container::size_type __count = 0;
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// Skip up to N - 1 elements larger than VALUE.
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// XXX: Could do binary search for random iterators.
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while (true)
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{
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if (__count >= __n)
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// VALUE is not in top N.
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return;
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if (__it == __output.end())
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break;
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if (*__it < __value)
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break;
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++__it;
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++__count;
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}
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__output.insert(__it, __value);
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}
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/* Copy the top N elements in INPUT, sorted in reverse order, to OUTPUT. */
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template<typename _Container>
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void
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__top_n(const _Container& __input, _Container& __output,
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typename _Container::size_type __n)
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{
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__output.clear();
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typename _Container::const_iterator __it;
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for (__it = __input.begin(); __it != __input.end(); ++__it)
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__insert_top_n(__output, *__it, __n);
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}
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/* Simplified clone of std::for_each. */
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template<typename _InputIterator, typename _Function>
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_Function
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__for_each(_InputIterator __first, _InputIterator __last, _Function __f)
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{
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for (; __first != __last; ++__first)
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__f(*__first);
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return __f;
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}
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/* Simplified clone of std::remove. */
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template<typename _ForwardIterator, typename _Tp>
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_ForwardIterator
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__remove(_ForwardIterator __first, _ForwardIterator __last,
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const _Tp& __value)
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{
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if(__first == __last)
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return __first;
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_ForwardIterator __result = __first;
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++__first;
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for(; __first != __last; ++__first)
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if(!(*__first == __value))
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{
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*__result = *__first;
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++__result;
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}
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return __result;
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}
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} // namespace __gnu_profile
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#endif /* _GLIBCXX_PROFILE_PROFILER_ALGOS_H */
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