examples/calc++/stack.hh

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/**
 ** \file ../../../../examples/calc++/stack.hh
 ** Define the yy::stack class.
 */

#ifndef YY_YY_EXAMPLES_CALC_STACK_HH_INCLUDED
# define YY_YY_EXAMPLES_CALC_STACK_HH_INCLUDED

# include <deque>


namespace yy {
/* Line 34 of stack.hh  */
#line 47 "../../../../examples/calc++/stack.hh"
  template <class T, class S = std::deque<T> >
  class stack
  {
  public:
    // Hide our reversed order.
    typedef typename S::reverse_iterator iterator;
    typedef typename S::const_reverse_iterator const_iterator;

    stack () : seq_ ()
    {
    }

    stack (unsigned int n) : seq_ (n)
    {
    }

    inline
    T&
    operator [] (unsigned int i)
    {
      return seq_[i];
    }

    inline
    const T&
    operator [] (unsigned int i) const
    {
      return seq_[i];
    }

    inline
    void
    push (const T& t)
    {
      seq_.push_front (t);
    }

    inline
    void
    pop (unsigned int n = 1)
    {
      for (; n; --n)
        seq_.pop_front ();
    }

    inline
    unsigned int
    height () const
    {
      return seq_.size ();
    }

    inline const_iterator begin () const { return seq_.rbegin (); }
    inline const_iterator end () const { return seq_.rend (); }

  private:
    S seq_;
  };

  /// Present a slice of the top of a stack.
  template <class T, class S = stack<T> >
  class slice
  {
  public:
    slice (const S& stack, unsigned int range)
      : stack_ (stack)
      , range_ (range)
    {
    }

    inline
    const T&
    operator [] (unsigned int i) const
    {
      return stack_[range_ - i];
    }

  private:
    const S& stack_;
    unsigned int range_;
  };

} // yy
/* Line 116 of stack.hh  */
#line 132 "../../../../examples/calc++/stack.hh"

#endif /* !YY_YY_EXAMPLES_CALC_STACK_HH_INCLUDED  */