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# C++ skeleton for Bison
# Copyright (C) 2002-2015, 2018-2020 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/>.
# b4_stack_file
# -------------
# Name of the file containing the stack class, if we want this file.
b4_defines_if([b4_required_version_if([302], [],
[m4_define([b4_stack_file], [stack.hh])])])
# b4_stack_define
# ---------------
m4_define([b4_stack_define],
[[ /// A stack with random access from its top.
template <typename T, typename S = std::vector<T> >
class stack
{
public:
// Hide our reversed order.
typedef typename S::iterator iterator;
typedef typename S::const_iterator const_iterator;
typedef typename S::size_type size_type;
typedef typename std::ptrdiff_t index_type;
stack (size_type n = 200)
: seq_ (n)
{}
/// Random access.
///
/// Index 0 returns the topmost element.
const T&
operator[] (index_type i) const
{
return seq_[size_type (size () - 1 - i)];
}
/// Random access.
///
/// Index 0 returns the topmost element.
T&
operator[] (index_type i)
{
return seq_[size_type (size () - 1 - i)];
}
/// Steal the contents of \a t.
///
/// Close to move-semantics.
void
push (YY_MOVE_REF (T) t)
{
seq_.push_back (T ());
operator[] (0).move (t);
}
/// Pop elements from the stack.
void
pop (std::ptrdiff_t n = 1) YY_NOEXCEPT
{
for (; 0 < n; --n)
seq_.pop_back ();
}
/// Pop all elements from the stack.
void
clear () YY_NOEXCEPT
{
seq_.clear ();
}
/// Number of elements on the stack.
index_type
size () const YY_NOEXCEPT
{
return index_type (seq_.size ());
}
/// Iterator on top of the stack (going downwards).
const_iterator
begin () const YY_NOEXCEPT
{
return seq_.begin ();
}
/// Bottom of the stack.
const_iterator
end () const YY_NOEXCEPT
{
return seq_.end ();
}
/// Present a slice of the top of a stack.
class slice
{
public:
slice (const stack& stack, index_type range)
: stack_ (stack)
, range_ (range)
{}
const T&
operator[] (index_type i) const
{
return stack_[range_ - i];
}
private:
const stack& stack_;
index_type range_;
};
private:
stack (const stack&);
stack& operator= (const stack&);
/// The wrapped container.
S seq_;
};
]])
m4_ifdef([b4_stack_file],
[b4_output_begin([b4_dir_prefix], [b4_stack_file])[
]b4_generated_by[
// Starting with Bison 3.2, this file is useless: the structure it
// used to define is now defined with the parser itself.
//
// To get rid of this file:
// 1. add '%require "3.2"' (or newer) to your grammar file
// 2. remove references to this file from your build system.
]b4_output_end[
]])
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