mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-09 20:33:03 +00:00
135 lines
2.5 KiB
C++
135 lines
2.5 KiB
C++
# C++ skeleton for Bison
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# Copyright (C) 2002-2012 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program 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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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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m4_pushdef([b4_copyright_years],
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[2002-2012])
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# We do want M4 expansion after # for CPP macros.
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m4_changecom()
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m4_divert_push(0)dnl
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@output(b4_dir_prefix[]stack.hh@)@
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b4_copyright([Stack handling for Bison parsers in C++])[
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#ifndef BISON_STACK_HH
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# define BISON_STACK_HH
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#include <deque>
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]b4_namespace_open[
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template <class T, class S = std::deque<T> >
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class stack
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{
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public:
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// Hide our reversed order.
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typedef typename S::reverse_iterator iterator;
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typedef typename S::const_reverse_iterator const_iterator;
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stack ()
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: seq_ ()
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{
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}
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stack (unsigned int n)
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: seq_ (n)
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{
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}
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inline
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T&
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operator [] (unsigned int i)
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{
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return seq_[i];
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}
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inline
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const T&
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operator [] (unsigned int i) const
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{
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return seq_[i];
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}
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inline
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void
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push (const T& t)
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{
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seq_.push_front (t);
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}
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inline
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void
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pop (unsigned int n = 1)
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{
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for (; n; --n)
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seq_.pop_front ();
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}
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inline
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typename S::size_type
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size () const
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{
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return seq_.size ();
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}
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inline
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const_iterator
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begin () const
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{
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return seq_.rbegin ();
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}
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inline
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const_iterator
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end () const
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{
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return seq_.rend ();
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}
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private:
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/// The wrapped container.
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S seq_;
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};
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/// Present a slice of the top of a stack.
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template <class T, class S = stack<T> >
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class slice
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{
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public:
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slice (const S& stack, unsigned int range)
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: stack_ (stack),
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range_ (range)
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{
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}
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inline
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const T&
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operator [] (unsigned int i) const
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{
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return stack_[range_ - i];
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}
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private:
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const S& stack_;
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unsigned int range_;
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};
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]b4_namespace_close[
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#endif // not BISON_STACK_HH[]dnl
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]
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m4_divert_pop(0)
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m4_popdef([b4_copyright_years])dnl
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m4_changecom([#])
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