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// -*- C++ -*-
// Copyright (C) 2005-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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, or (at your option) any later
// version.
// This library 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.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
// Permission to use, copy, modify, sell, and distribute this software
// is hereby granted without fee, provided that the above copyright
// notice appears in all copies, and that both that copyright notice
// and this permission notice appear in supporting documentation. None
// of the above authors, nor IBM Haifa Research Laboratories, make any
// representation about the suitability of this software for any
// purpose. It is provided "as is" without express or implied
// warranty.
/**
* @file rc_binomial_heap_/rc.hpp
* Contains a redundant (binary counter).
*/
#ifndef PB_DS_RC_HPP
#define PB_DS_RC_HPP
namespace __gnu_pbds
{
namespace detail
{
/// Redundant binary counter.
template<typename _Node, typename _Alloc>
class rc
{
private:
typedef _Alloc allocator_type;
typedef typename allocator_type::size_type size_type;
typedef _Node node;
typedef typename _Alloc::template rebind<node> __rebind_n;
typedef typename __rebind_n::other::pointer node_pointer;
typedef typename _Alloc::template rebind<node_pointer> __rebind_np;
typedef typename __rebind_np::other::pointer entry_pointer;
typedef typename __rebind_np::other::const_pointer entry_const_pointer;
enum
{
max_entries = sizeof(size_type) << 3
};
public:
typedef node_pointer entry;
typedef entry_const_pointer const_iterator;
rc();
rc(const rc&);
inline void
swap(rc&);
inline void
push(entry);
inline node_pointer
top() const;
inline void
pop();
inline bool
empty() const;
inline size_type
size() const;
void
clear();
const const_iterator
begin() const;
const const_iterator
end() const;
#ifdef _GLIBCXX_DEBUG
void
assert_valid(const char*, int) const;
#endif
#ifdef PB_DS_RC_BINOMIAL_HEAP_TRACE_
void
trace() const;
#endif
private:
node_pointer m_a_entries[max_entries];
size_type m_over_top;
};
template<typename _Node, typename _Alloc>
rc<_Node, _Alloc>::
rc() : m_over_top(0)
{ PB_DS_ASSERT_VALID((*this)) }
template<typename _Node, typename _Alloc>
rc<_Node, _Alloc>::
rc(const rc<_Node, _Alloc>& other) : m_over_top(0)
{ PB_DS_ASSERT_VALID((*this)) }
template<typename _Node, typename _Alloc>
inline void
rc<_Node, _Alloc>::
swap(rc<_Node, _Alloc>& other)
{
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
const size_type over_top = std::max(m_over_top, other.m_over_top);
for (size_type i = 0; i < over_top; ++i)
std::swap(m_a_entries[i], other.m_a_entries[i]);
std::swap(m_over_top, other.m_over_top);
PB_DS_ASSERT_VALID((*this))
PB_DS_ASSERT_VALID(other)
}
template<typename _Node, typename _Alloc>
inline void
rc<_Node, _Alloc>::
push(entry p_nd)
{
PB_DS_ASSERT_VALID((*this))
_GLIBCXX_DEBUG_ASSERT(m_over_top < max_entries);
m_a_entries[m_over_top++] = p_nd;
PB_DS_ASSERT_VALID((*this))
}
template<typename _Node, typename _Alloc>
inline void
rc<_Node, _Alloc>::
pop()
{
PB_DS_ASSERT_VALID((*this))
_GLIBCXX_DEBUG_ASSERT(!empty());
--m_over_top;
PB_DS_ASSERT_VALID((*this))
}
template<typename _Node, typename _Alloc>
inline typename rc<_Node, _Alloc>::node_pointer
rc<_Node, _Alloc>::
top() const
{
PB_DS_ASSERT_VALID((*this))
_GLIBCXX_DEBUG_ASSERT(!empty());
return *(m_a_entries + m_over_top - 1);
}
template<typename _Node, typename _Alloc>
inline bool
rc<_Node, _Alloc>::
empty() const
{
PB_DS_ASSERT_VALID((*this))
return m_over_top == 0;
}
template<typename _Node, typename _Alloc>
inline typename rc<_Node, _Alloc>::size_type
rc<_Node, _Alloc>::
size() const
{ return m_over_top; }
template<typename _Node, typename _Alloc>
void
rc<_Node, _Alloc>::
clear()
{
PB_DS_ASSERT_VALID((*this))
m_over_top = 0;
PB_DS_ASSERT_VALID((*this))
}
template<typename _Node, typename _Alloc>
const typename rc<_Node, _Alloc>::const_iterator
rc<_Node, _Alloc>::
begin() const
{ return& m_a_entries[0]; }
template<typename _Node, typename _Alloc>
const typename rc<_Node, _Alloc>::const_iterator
rc<_Node, _Alloc>::
end() const
{ return& m_a_entries[m_over_top]; }
#ifdef _GLIBCXX_DEBUG
template<typename _Node, typename _Alloc>
void
rc<_Node, _Alloc>::
assert_valid(const char* __file, int __line) const
{ PB_DS_DEBUG_VERIFY(m_over_top < max_entries); }
#endif
#ifdef PB_DS_RC_BINOMIAL_HEAP_TRACE_
template<typename _Node, typename _Alloc>
void
rc<_Node, _Alloc>::
trace() const
{
std::cout << "rc" << std::endl;
for (size_type i = 0; i < m_over_top; ++i)
std::cerr << m_a_entries[i] << std::endl;
std::cout << std::endl;
}
#endif
} // namespace detail
} // namespace __gnu_pbds
#endif
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