rc.hpp
Go to the documentation of this file.
// -*- C++ -*-
// Copyright (C) 2005-2021 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 rebind_traits<_Alloc, node>::pointer node_pointer;
typedef typename rebind_traits<_Alloc, node_pointer>::pointer
entry_pointer;
typedef typename rebind_traits<_Alloc, node_pointer>::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();
_GLIBCXX_NODISCARD 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>
_GLIBCXX_NODISCARD 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
std::swap
void swap(any &__x, any &__y) noexcept
Exchange the states of two any objects.
Definition: any:428
std::begin
_Tp * begin(valarray< _Tp > &__va) noexcept
Return an iterator pointing to the first element of the valarray.
Definition: valarray:1215
std::max
constexpr const _Tp & max(const _Tp &, const _Tp &)
This does what you think it does.
Definition: stl_algobase.h:254
std
ISO C++ entities toplevel namespace is std.
std::cerr
ostream cerr
Linked to standard output.
std::empty
constexpr auto empty(const _Container &__cont) noexcept(noexcept(__cont.empty())) -> decltype(__cont.empty())
Return whether a container is empty.
Definition: range_access.h:263
std::size
constexpr auto size(const _Container &__cont) noexcept(noexcept(__cont.size())) -> decltype(__cont.size())
Return the size of a container.
Definition: range_access.h:245
std::endl
basic_ostream< _CharT, _Traits > & endl(basic_ostream< _CharT, _Traits > &__os)
Write a newline and flush the stream.
Definition: ostream:684
std::cout
ostream cout
Linked to standard input.
__gnu_pbds
GNU extensions for policy-based data structures for public use.
Definition: assoc_container.hpp:52
__gnu_pbds::detail::rebind_traits
Consistent API for accessing allocator-related types.
Definition: types_traits.hpp:140
__gnu_pbds::detail::rc
Redundant binary counter.
Definition: rc.hpp:51