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# C++ skeleton for Bison
# Copyright (C) 2002-2015, 2018 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
m4_pushdef([b4_copyright_years],
[2002-2015, 2018])
# b4_stack_define
# ---------------
m4_define([b4_stack_define],
[[ /// A stack with random access from its top.
template <class T, class S = std::vector<T> >
class stack
{
public:
// Hide our reversed order.
typedef typename S::reverse_iterator iterator;
typedef typename S::const_reverse_iterator const_iterator;
typedef typename S::size_type size_type;
stack ()
{
seq_.reserve (200);
}
stack (size_type n)
: seq_ (n)
{}
/// Random access.
///
/// Index 0 returns the topmost element.
T&
operator[] (size_type i)
{
return seq_[seq_.size () - 1 - i];
}
/// Random access.
///
/// Index 0 returns the topmost element.
const T&
operator[] (size_type i) const
{
return seq_[seq_.size () - 1 - i];
}
/// Steal the contents of \a t.
///
/// Close to move-semantics.
void
push (T& t)
{
seq_.push_back (T());
operator[](0).move (t);
}
void
pop (size_type n = 1)
{
for (; n; --n)
seq_.pop_back ();
}
void
clear ()
{
seq_.clear ();
}
size_type
size () const
{
return seq_.size ();
}
const_iterator
begin () const
{
return seq_.rbegin ();
}
const_iterator
end () const
{
return seq_.rend ();
}
private:
stack (const stack&);
stack& operator= (const stack&);
/// The wrapped container.
S seq_;
};
/// Present a slice of the top of a stack.
template <class T, class S = stack<T> >
class slice
{
public:
typedef typename S::size_type size_type;
slice (const S& stack, size_type range)
: stack_ (stack)
, range_ (range)
{}
const T&
operator[] (size_type i) const
{
return stack_[range_ - i];
}
private:
const S& stack_;
size_type range_;
};
]])
b4_defines_if(
[b4_output_begin([b4_dir_prefix[]stack.hh])
b4_copyright([Stack handling for Bison parsers in C++])[
/**
** \file ]b4_dir_prefix[stack.hh
** Define the ]b4_namespace_ref[::stack class.
*/
]b4_cpp_guard_open([b4_dir_prefix[]stack.hh])[
# include <vector>
]b4_namespace_open[
]b4_stack_define[
]b4_namespace_close[
]b4_cpp_guard_close([b4_dir_prefix[]stack.hh])
b4_output_end()
])
m4_popdef([b4_copyright_years])
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