libstdc++
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00001 // -*- C++ -*- 00002 // 00003 // Copyright (C) 2010 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the terms 00007 // of the GNU General Public License as published by the Free Software 00008 // Foundation; either version 2, or (at your option) any later 00009 // version. 00010 00011 // This library is distributed in the hope that it will be useful, but 00012 // WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 // General Public License for more details. 00015 00016 // You should have received a copy of the GNU General Public License 00017 // along with this library; see the file COPYING. If not, write to 00018 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 00019 // MA 02111-1307, USA. 00020 00021 // As a special exception, you may use this file as part of a free 00022 // software library without restriction. Specifically, if other files 00023 // instantiate templates or use macros or inline functions from this 00024 // file, or you compile this file and link it with other files to 00025 // produce an executable, this file does not by itself cause the 00026 // resulting executable to be covered by the GNU General Public 00027 // License. This exception does not however invalidate any other 00028 // reasons why the executable file might be covered by the GNU General 00029 // Public License. 00030 00031 /** @file profile/impl/profiler_algos.h 00032 * @brief Algorithms used by the profile extension. 00033 * 00034 * This file is needed to avoid including <algorithm> or <bits/stl_algo.h>. 00035 * Including those files would result in recursive includes. 00036 * These implementations are oversimplified. In general, efficiency may be 00037 * sacrificed to minimize maintenance overhead. 00038 */ 00039 00040 #ifndef _GLIBCXX_PROFILE_PROFILER_ALGOS_H 00041 #define _GLIBCXX_PROFILE_PROFILER_ALGOS_H 1 00042 00043 namespace __gnu_profile 00044 { 00045 /* Helper for __top_n. Insert in sorted vector, but not beyond Nth elem. */ 00046 template<typename _Container> 00047 void 00048 __insert_top_n(_Container& __output, 00049 const typename _Container::value_type& __value, 00050 typename _Container::size_type __n) 00051 { 00052 typename _Container::iterator __it = __output.begin(); 00053 typename _Container::size_type __count = 0; 00054 00055 // Skip up to N - 1 elements larger than VALUE. 00056 // XXX: Could do binary search for random iterators. 00057 while (true) 00058 { 00059 if (__count >= __n) 00060 // VALUE is not in top N. 00061 return; 00062 00063 if (__it == __output.end()) 00064 break; 00065 00066 if (*__it < __value) 00067 break; 00068 00069 ++__it; 00070 ++__count; 00071 } 00072 00073 __output.insert(__it, __value); 00074 } 00075 00076 /* Copy the top N elements in INPUT, sorted in reverse order, to OUTPUT. */ 00077 template<typename _Container> 00078 void 00079 __top_n(const _Container& __input, _Container& __output, 00080 typename _Container::size_type __n) 00081 { 00082 __output.clear(); 00083 typename _Container::const_iterator __it; 00084 for (__it = __input.begin(); __it != __input.end(); ++__it) 00085 __insert_top_n(__output, *__it, __n); 00086 } 00087 00088 /* Simplified clone of std::for_each. */ 00089 template<typename _InputIterator, typename _Function> 00090 _Function 00091 __for_each(_InputIterator __first, _InputIterator __last, _Function __f) 00092 { 00093 for (; __first != __last; ++__first) 00094 __f(*__first); 00095 return __f; 00096 } 00097 00098 /* Simplified clone of std::remove. */ 00099 template<typename _ForwardIterator, typename _Tp> 00100 _ForwardIterator 00101 __remove(_ForwardIterator __first, _ForwardIterator __last, 00102 const _Tp& __value) 00103 { 00104 if(__first == __last) 00105 return __first; 00106 _ForwardIterator __result = __first; 00107 ++__first; 00108 for(; __first != __last; ++__first) 00109 if(!(*__first == __value)) 00110 { 00111 *__result = *__first; 00112 ++__result; 00113 } 00114 return __result; 00115 } 00116 } // namespace __gnu_profile 00117 00118 #endif /* _GLIBCXX_PROFILE_PROFILER_ALGOS_H */