data/stack.hh

   1 # C++ skeleton for Bison
   2
   3 # Copyright (C) 2002-2013 Free Software Foundation, Inc.
   4
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 m4_pushdef([b4_copyright_years],
  19            [2002-2013])
  20
  21 # b4_stack_define
  22 # ---------------
  23 m4_define([b4_stack_define],
  24 [[  template <class T, class S = std::vector<T> >
  25   class stack
  26   {
  27   public:
  28     // Hide our reversed order.
  29     typedef typename S::reverse_iterator iterator;
  30     typedef typename S::const_reverse_iterator const_iterator;
  31
  32     stack ()
  33       : seq_ ()
  34     {
  35     }
  36
  37     stack (unsigned int n)
  38       : seq_ (n)
  39     {
  40     }
  41
  42     inline
  43     T&
  44     operator[] (unsigned int i)
  45     {
  46       return seq_[seq_.size () - 1 - i];
  47     }
  48
  49     inline
  50     const T&
  51     operator[] (unsigned int i) const
  52     {
  53       return seq_[seq_.size () - 1 - i];
  54     }
  55
  56     /// Steal the contents of \a t.
  57     ///
  58     /// Close to move-semantics.
  59     inline
  60     void
  61     push (T& t)
  62     {
  63       seq_.push_back (T());
  64       operator[](0).move (t);
  65     }
  66
  67     inline
  68     void
  69     pop (unsigned int n = 1)
  70     {
  71       for (; n; --n)
  72         seq_.pop_back ();
  73     }
  74
  75     inline
  76     typename S::size_type
  77     size () const
  78     {
  79       return seq_.size ();
  80     }
  81
  82     inline
  83     const_iterator
  84     begin () const
  85     {
  86       return seq_.rbegin ();
  87     }
  88
  89     inline
  90     const_iterator
  91     end () const
  92     {
  93       return seq_.rend ();
  94     }
  95
  96   private:
  97     /// The wrapped container.
  98     S seq_;
  99   };
 100
 101   /// Present a slice of the top of a stack.
 102   template <class T, class S = stack<T> >
 103   class slice
 104   {
 105   public:
 106     slice (const S& stack, unsigned int range)
 107       : stack_ (stack)
 108       , range_ (range)
 109     {
 110     }
 111
 112     inline
 113     const T&
 114     operator [] (unsigned int i) const
 115     {
 116       return stack_[range_ - i];
 117     }
 118
 119   private:
 120     const S& stack_;
 121     unsigned int range_;
 122   };
 123 ]])
 124
 125 b4_defines_if(
 126 [b4_output_begin([b4_dir_prefix[]stack.hh])
 127 b4_copyright([Stack handling for Bison parsers in C++])[
 128
 129 /**
 130  ** \file ]b4_dir_prefix[stack.hh
 131  ** Define the ]b4_namespace_ref[::stack class.
 132  */
 133
 134 ]b4_cpp_guard_open([b4_dir_prefix[]stack.hh])[
 135
 136 # include <vector>
 137
 138 ]b4_namespace_open[
 139 ]b4_stack_define[
 140 ]b4_namespace_close[
 141
 142 ]b4_cpp_guard_close([b4_dir_prefix[]stack.hh])
 143 b4_output_end()
 144 ])
 145
 146 m4_popdef([b4_copyright_years])