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author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
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date | Tue, 10 May 2011 06:26:08 +0900 |
parents | Bison-Flex/EUC/stack.hh@3f4ade70b4d2 |
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1 /* A Bison parser, made by GNU Bison 2.3. */ |
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2 |
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3 /* Stack handling for Bison parsers in C++ |
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4 |
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5 Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. |
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6 |
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7 This program is free software; you can redistribute it and/or modify |
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8 it under the terms of the GNU General Public License as published by |
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9 the Free Software Foundation; either version 2, or (at your option) |
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10 any later version. |
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11 |
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12 This program is distributed in the hope that it will be useful, |
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 GNU General Public License for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with this program; if not, write to the Free Software |
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19 Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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20 Boston, MA 02110-1301, USA. */ |
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21 |
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22 /* As a special exception, you may create a larger work that contains |
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23 part or all of the Bison parser skeleton and distribute that work |
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24 under terms of your choice, so long as that work isn't itself a |
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25 parser generator using the skeleton or a modified version thereof |
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26 as a parser skeleton. Alternatively, if you modify or redistribute |
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27 the parser skeleton itself, you may (at your option) remove this |
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28 special exception, which will cause the skeleton and the resulting |
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29 Bison output files to be licensed under the GNU General Public |
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30 License without this special exception. |
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31 |
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32 This special exception was added by the Free Software Foundation in |
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33 version 2.2 of Bison. */ |
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34 |
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35 #ifndef BISON_STACK_HH |
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36 # define BISON_STACK_HH |
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37 |
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38 #include <deque> |
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39 |
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40 namespace yy |
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41 { |
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42 template <class T, class S = std::deque<T> > |
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43 class stack |
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44 { |
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45 public: |
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46 |
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47 // Hide our reversed order. |
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48 typedef typename S::reverse_iterator iterator; |
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49 typedef typename S::const_reverse_iterator const_iterator; |
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50 |
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51 stack () : seq_ () |
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52 { |
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53 } |
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54 |
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55 stack (unsigned int n) : seq_ (n) |
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56 { |
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57 } |
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58 |
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59 inline |
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60 T& |
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61 operator [] (unsigned int i) |
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62 { |
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63 return seq_[i]; |
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64 } |
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65 |
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66 inline |
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67 const T& |
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68 operator [] (unsigned int i) const |
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69 { |
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70 return seq_[i]; |
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71 } |
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72 |
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73 inline |
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74 void |
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75 push (const T& t) |
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76 { |
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77 seq_.push_front (t); |
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78 } |
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79 |
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80 inline |
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81 void |
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82 pop (unsigned int n = 1) |
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83 { |
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84 for (; n; --n) |
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85 seq_.pop_front (); |
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86 } |
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87 |
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88 inline |
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89 unsigned int |
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90 height () const |
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91 { |
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92 return seq_.size (); |
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93 } |
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94 |
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95 inline const_iterator begin () const { return seq_.rbegin (); } |
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96 inline const_iterator end () const { return seq_.rend (); } |
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97 |
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98 private: |
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99 |
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100 S seq_; |
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101 }; |
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102 |
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103 /// Present a slice of the top of a stack. |
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104 template <class T, class S = stack<T> > |
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105 class slice |
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106 { |
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107 public: |
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108 |
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109 slice (const S& stack, |
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110 unsigned int range) : stack_ (stack), |
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111 range_ (range) |
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112 { |
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113 } |
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114 |
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115 inline |
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116 const T& |
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117 operator [] (unsigned int i) const |
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118 { |
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119 return stack_[range_ - i]; |
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120 } |
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121 |
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122 private: |
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123 |
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124 const S& stack_; |
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125 unsigned int range_; |
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126 }; |
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127 } |
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128 |
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129 #endif // not BISON_STACK_HH |