1230 lines
33 KiB
C++
1230 lines
33 KiB
C++
// <bitset> -*- C++ -*-
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// Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library 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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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/*
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* Copyright (c) 1998
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file bitset
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* This is a Standard C++ Library header. You should @c #include this header
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* in your programs, rather than any of the "st[dl]_*.h" implementation files.
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*/
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#ifndef _GLIBCXX_BITSET
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#define _GLIBCXX_BITSET 1
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#pragma GCC system_header
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#include <cstddef> // For size_t
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#include <cstring> // For memset
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#include <limits> // For numeric_limits
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#include <string>
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#include <bits/functexcept.h> // For invalid_argument, out_of_range,
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// overflow_error
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#include <ostream> // For ostream (operator<<)
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#include <istream> // For istream (operator>>)
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#define _GLIBCXX_BITSET_BITS_PER_WORD numeric_limits<unsigned long>::digits
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#define _GLIBCXX_BITSET_WORDS(__n) \
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((__n) < 1 ? 0 : ((__n) + _GLIBCXX_BITSET_BITS_PER_WORD - 1)/_GLIBCXX_BITSET_BITS_PER_WORD)
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namespace _GLIBCXX_STD
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{
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/**
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* @if maint
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* Base class, general case. It is a class inveriant that _Nw will be
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* nonnegative.
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*
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* See documentation for bitset.
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* @endif
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*/
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template<size_t _Nw>
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struct _Base_bitset
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{
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typedef unsigned long _WordT;
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/// 0 is the least significant word.
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_WordT _M_w[_Nw];
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_Base_bitset() { _M_do_reset(); }
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_Base_bitset(unsigned long __val)
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{
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_M_do_reset();
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_M_w[0] = __val;
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}
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static size_t
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_S_whichword(size_t __pos )
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{ return __pos / _GLIBCXX_BITSET_BITS_PER_WORD; }
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static size_t
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_S_whichbyte(size_t __pos )
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{ return (__pos % _GLIBCXX_BITSET_BITS_PER_WORD) / __CHAR_BIT__; }
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static size_t
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_S_whichbit(size_t __pos )
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{ return __pos % _GLIBCXX_BITSET_BITS_PER_WORD; }
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static _WordT
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_S_maskbit(size_t __pos )
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{ return (static_cast<_WordT>(1)) << _S_whichbit(__pos); }
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_WordT&
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_M_getword(size_t __pos)
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{ return _M_w[_S_whichword(__pos)]; }
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_WordT
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_M_getword(size_t __pos) const
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{ return _M_w[_S_whichword(__pos)]; }
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_WordT&
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_M_hiword() { return _M_w[_Nw - 1]; }
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_WordT
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_M_hiword() const { return _M_w[_Nw - 1]; }
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void
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_M_do_and(const _Base_bitset<_Nw>& __x)
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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_M_w[__i] &= __x._M_w[__i];
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}
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void
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_M_do_or(const _Base_bitset<_Nw>& __x)
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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_M_w[__i] |= __x._M_w[__i];
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}
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void
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_M_do_xor(const _Base_bitset<_Nw>& __x)
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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_M_w[__i] ^= __x._M_w[__i];
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}
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void
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_M_do_left_shift(size_t __shift);
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void
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_M_do_right_shift(size_t __shift);
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void
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_M_do_flip()
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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_M_w[__i] = ~_M_w[__i];
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}
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void
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_M_do_set()
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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_M_w[__i] = ~static_cast<_WordT>(0);
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}
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void
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_M_do_reset() { memset(_M_w, 0, _Nw * sizeof(_WordT)); }
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bool
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_M_is_equal(const _Base_bitset<_Nw>& __x) const
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{
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for (size_t __i = 0; __i < _Nw; ++__i)
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{
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if (_M_w[__i] != __x._M_w[__i])
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return false;
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}
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return true;
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}
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bool
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_M_is_any() const
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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{
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if (_M_w[__i] != static_cast<_WordT>(0))
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return true;
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}
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return false;
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}
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size_t
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_M_do_count() const
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{
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size_t __result = 0;
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for (size_t __i = 0; __i < _Nw; __i++)
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__result += __builtin_popcountl(_M_w[__i]);
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return __result;
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}
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unsigned long
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_M_do_to_ulong() const;
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// find first "on" bit
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size_t
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_M_do_find_first(size_t __not_found) const;
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// find the next "on" bit that follows "prev"
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size_t
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_M_do_find_next(size_t __prev, size_t __not_found) const;
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};
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// Definitions of non-inline functions from _Base_bitset.
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template<size_t _Nw>
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void
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_Base_bitset<_Nw>::_M_do_left_shift(size_t __shift)
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{
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if (__builtin_expect(__shift != 0, 1))
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{
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const size_t __wshift = __shift / _GLIBCXX_BITSET_BITS_PER_WORD;
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const size_t __offset = __shift % _GLIBCXX_BITSET_BITS_PER_WORD;
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if (__offset == 0)
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for (size_t __n = _Nw - 1; __n >= __wshift; --__n)
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_M_w[__n] = _M_w[__n - __wshift];
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else
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{
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const size_t __sub_offset = _GLIBCXX_BITSET_BITS_PER_WORD - __offset;
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for (size_t __n = _Nw - 1; __n > __wshift; --__n)
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_M_w[__n] = (_M_w[__n - __wshift] << __offset) |
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(_M_w[__n - __wshift - 1] >> __sub_offset);
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_M_w[__wshift] = _M_w[0] << __offset;
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}
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std::fill(_M_w + 0, _M_w + __wshift, static_cast<_WordT>(0));
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}
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}
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template<size_t _Nw>
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void
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_Base_bitset<_Nw>::_M_do_right_shift(size_t __shift)
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{
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if (__builtin_expect(__shift != 0, 1))
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{
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const size_t __wshift = __shift / _GLIBCXX_BITSET_BITS_PER_WORD;
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const size_t __offset = __shift % _GLIBCXX_BITSET_BITS_PER_WORD;
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const size_t __limit = _Nw - __wshift - 1;
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if (__offset == 0)
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for (size_t __n = 0; __n <= __limit; ++__n)
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_M_w[__n] = _M_w[__n + __wshift];
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else
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{
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const size_t __sub_offset = _GLIBCXX_BITSET_BITS_PER_WORD - __offset;
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for (size_t __n = 0; __n < __limit; ++__n)
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_M_w[__n] = (_M_w[__n + __wshift] >> __offset) |
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(_M_w[__n + __wshift + 1] << __sub_offset);
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_M_w[__limit] = _M_w[_Nw-1] >> __offset;
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}
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std::fill(_M_w + __limit + 1, _M_w + _Nw, static_cast<_WordT>(0));
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}
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}
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template<size_t _Nw>
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unsigned long
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_Base_bitset<_Nw>::_M_do_to_ulong() const
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{
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for (size_t __i = 1; __i < _Nw; ++__i)
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if (_M_w[__i])
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__throw_overflow_error(__N("_Base_bitset::_M_do_to_ulong"));
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return _M_w[0];
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}
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template<size_t _Nw>
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size_t
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_Base_bitset<_Nw>::_M_do_find_first(size_t __not_found) const
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{
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for (size_t __i = 0; __i < _Nw; __i++)
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{
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_WordT __thisword = _M_w[__i];
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if (__thisword != static_cast<_WordT>(0))
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return __i * _GLIBCXX_BITSET_BITS_PER_WORD
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+ __builtin_ctzl(__thisword);
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}
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// not found, so return an indication of failure.
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return __not_found;
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}
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template<size_t _Nw>
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size_t
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_Base_bitset<_Nw>::_M_do_find_next(size_t __prev, size_t __not_found) const
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{
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// make bound inclusive
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++__prev;
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// check out of bounds
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if (__prev >= _Nw * _GLIBCXX_BITSET_BITS_PER_WORD)
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return __not_found;
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// search first word
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size_t __i = _S_whichword(__prev);
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_WordT __thisword = _M_w[__i];
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// mask off bits below bound
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__thisword &= (~static_cast<_WordT>(0)) << _S_whichbit(__prev);
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if (__thisword != static_cast<_WordT>(0))
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return __i * _GLIBCXX_BITSET_BITS_PER_WORD
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+ __builtin_ctzl(__thisword);
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// check subsequent words
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__i++;
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for ( ; __i < _Nw; __i++ )
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{
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__thisword = _M_w[__i];
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if (__thisword != static_cast<_WordT>(0))
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return __i * _GLIBCXX_BITSET_BITS_PER_WORD
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+ __builtin_ctzl(__thisword);
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}
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// not found, so return an indication of failure.
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return __not_found;
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} // end _M_do_find_next
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/**
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* @if maint
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* Base class, specialization for a single word.
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*
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* See documentation for bitset.
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* @endif
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*/
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template<>
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struct _Base_bitset<1>
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{
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typedef unsigned long _WordT;
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_WordT _M_w;
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_Base_bitset( void ) : _M_w(0) {}
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_Base_bitset(unsigned long __val) : _M_w(__val) {}
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static size_t
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_S_whichword(size_t __pos )
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{ return __pos / _GLIBCXX_BITSET_BITS_PER_WORD; }
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static size_t
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_S_whichbyte(size_t __pos )
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{ return (__pos % _GLIBCXX_BITSET_BITS_PER_WORD) / __CHAR_BIT__; }
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static size_t
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_S_whichbit(size_t __pos )
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{ return __pos % _GLIBCXX_BITSET_BITS_PER_WORD; }
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static _WordT
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_S_maskbit(size_t __pos )
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{ return (static_cast<_WordT>(1)) << _S_whichbit(__pos); }
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_WordT&
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_M_getword(size_t) { return _M_w; }
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_WordT
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_M_getword(size_t) const { return _M_w; }
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_WordT&
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_M_hiword() { return _M_w; }
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_WordT
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_M_hiword() const { return _M_w; }
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void
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_M_do_and(const _Base_bitset<1>& __x) { _M_w &= __x._M_w; }
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void
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_M_do_or(const _Base_bitset<1>& __x) { _M_w |= __x._M_w; }
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void
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_M_do_xor(const _Base_bitset<1>& __x) { _M_w ^= __x._M_w; }
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void
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_M_do_left_shift(size_t __shift) { _M_w <<= __shift; }
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void
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_M_do_right_shift(size_t __shift) { _M_w >>= __shift; }
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void
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_M_do_flip() { _M_w = ~_M_w; }
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void
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_M_do_set() { _M_w = ~static_cast<_WordT>(0); }
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void
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_M_do_reset() { _M_w = 0; }
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bool
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_M_is_equal(const _Base_bitset<1>& __x) const
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{ return _M_w == __x._M_w; }
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bool
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_M_is_any() const { return _M_w != 0; }
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size_t
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_M_do_count() const { return __builtin_popcountl(_M_w); }
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unsigned long
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_M_do_to_ulong() const { return _M_w; }
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size_t
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_M_do_find_first(size_t __not_found) const
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{
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if (_M_w != 0)
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return __builtin_ctzl(_M_w);
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else
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return __not_found;
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}
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// find the next "on" bit that follows "prev"
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size_t
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_M_do_find_next(size_t __prev, size_t __not_found) const
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{
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++__prev;
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if (__prev >= ((size_t) _GLIBCXX_BITSET_BITS_PER_WORD))
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return __not_found;
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_WordT __x = _M_w >> __prev;
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if (__x != 0)
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return __builtin_ctzl(__x) + __prev;
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else
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return __not_found;
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}
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};
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/**
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* @if maint
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* Base class, specialization for no storage (zero-length %bitset).
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*
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* See documentation for bitset.
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* @endif
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*/
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template<>
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struct _Base_bitset<0>
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{
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typedef unsigned long _WordT;
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_Base_bitset() {}
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_Base_bitset(unsigned long) {}
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static size_t
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_S_whichword(size_t __pos )
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{ return __pos / _GLIBCXX_BITSET_BITS_PER_WORD; }
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static size_t
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_S_whichbyte(size_t __pos )
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{ return (__pos % _GLIBCXX_BITSET_BITS_PER_WORD) / __CHAR_BIT__; }
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static size_t
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_S_whichbit(size_t __pos )
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{ return __pos % _GLIBCXX_BITSET_BITS_PER_WORD; }
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static _WordT
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_S_maskbit(size_t __pos )
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{ return (static_cast<_WordT>(1)) << _S_whichbit(__pos); }
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// This would normally give access to the data. The bounds-checking
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// in the bitset class will prevent the user from getting this far,
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// but (1) it must still return an lvalue to compile, and (2) the
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// user might call _Unchecked_set directly, in which case this /needs/
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// to fail. Let's not penalize zero-length users unless they actually
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// make an unchecked call; all the memory ugliness is therefore
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// localized to this single should-never-get-this-far function.
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_WordT&
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_M_getword(size_t) const
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{
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__throw_out_of_range(__N("_Base_bitset::_M_getword"));
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return *new _WordT;
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}
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_WordT
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_M_hiword() const { return 0; }
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void
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_M_do_and(const _Base_bitset<0>&) { }
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void
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_M_do_or(const _Base_bitset<0>&) { }
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void
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_M_do_xor(const _Base_bitset<0>&) { }
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void
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_M_do_left_shift(size_t) { }
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void
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_M_do_right_shift(size_t) { }
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void
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_M_do_flip() { }
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void
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_M_do_set() { }
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void
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_M_do_reset() { }
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// Are all empty bitsets equal to each other? Are they equal to
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// themselves? How to compare a thing which has no state? What is
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// the sound of one zero-length bitset clapping?
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bool
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_M_is_equal(const _Base_bitset<0>&) const { return true; }
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bool
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_M_is_any() const { return false; }
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size_t
|
|
_M_do_count() const { return 0; }
|
|
|
|
unsigned long
|
|
_M_do_to_ulong() const { return 0; }
|
|
|
|
// Normally "not found" is the size, but that could also be
|
|
// misinterpreted as an index in this corner case. Oh well.
|
|
size_t
|
|
_M_do_find_first(size_t) const { return 0; }
|
|
|
|
size_t
|
|
_M_do_find_next(size_t, size_t) const { return 0; }
|
|
};
|
|
|
|
|
|
// Helper class to zero out the unused high-order bits in the highest word.
|
|
template<size_t _Extrabits>
|
|
struct _Sanitize
|
|
{
|
|
static void _S_do_sanitize(unsigned long& __val)
|
|
{ __val &= ~((~static_cast<unsigned long>(0)) << _Extrabits); }
|
|
};
|
|
|
|
template<>
|
|
struct _Sanitize<0>
|
|
{ static void _S_do_sanitize(unsigned long) { } };
|
|
|
|
|
|
/**
|
|
* @brief The %bitset class represents a @e fixed-size sequence of bits.
|
|
*
|
|
* @ingroup Containers
|
|
*
|
|
* (Note that %bitset does @e not meet the formal requirements of a
|
|
* <a href="tables.html#65">container</a>. Mainly, it lacks iterators.)
|
|
*
|
|
* The template argument, @a Nb, may be any non-negative number,
|
|
* specifying the number of bits (e.g., "0", "12", "1024*1024").
|
|
*
|
|
* In the general unoptimized case, storage is allocated in word-sized
|
|
* blocks. Let B be the number of bits in a word, then (Nb+(B-1))/B
|
|
* words will be used for storage. B - Nb%B bits are unused. (They are
|
|
* the high-order bits in the highest word.) It is a class invariant
|
|
* that those unused bits are always zero.
|
|
*
|
|
* If you think of %bitset as "a simple array of bits," be aware that
|
|
* your mental picture is reversed: a %bitset behaves the same way as
|
|
* bits in integers do, with the bit at index 0 in the "least significant
|
|
* / right-hand" position, and the bit at index Nb-1 in the "most
|
|
* significant / left-hand" position. Thus, unlike other containers, a
|
|
* %bitset's index "counts from right to left," to put it very loosely.
|
|
*
|
|
* This behavior is preserved when translating to and from strings. For
|
|
* example, the first line of the following program probably prints
|
|
* "b('a') is 0001100001" on a modern ASCII system.
|
|
*
|
|
* @code
|
|
* #include <bitset>
|
|
* #include <iostream>
|
|
* #include <sstream>
|
|
*
|
|
* using namespace std;
|
|
*
|
|
* int main()
|
|
* {
|
|
* long a = 'a';
|
|
* bitset<10> b(a);
|
|
*
|
|
* cout << "b('a') is " << b << endl;
|
|
*
|
|
* ostringstream s;
|
|
* s << b;
|
|
* string str = s.str();
|
|
* cout << "index 3 in the string is " << str[3] << " but\n"
|
|
* << "index 3 in the bitset is " << b[3] << endl;
|
|
* }
|
|
* @endcode
|
|
*
|
|
* Also see http://gcc.gnu.org/onlinedocs/libstdc++/ext/sgiexts.html#ch23
|
|
* for a description of extensions.
|
|
*
|
|
* @if maint
|
|
* Most of the actual code isn't contained in %bitset<> itself, but in the
|
|
* base class _Base_bitset. The base class works with whole words, not with
|
|
* individual bits. This allows us to specialize _Base_bitset for the
|
|
* important special case where the %bitset is only a single word.
|
|
*
|
|
* Extra confusion can result due to the fact that the storage for
|
|
* _Base_bitset @e is a regular array, and is indexed as such. This is
|
|
* carefully encapsulated.
|
|
* @endif
|
|
*/
|
|
template<size_t _Nb>
|
|
class bitset : private _Base_bitset<_GLIBCXX_BITSET_WORDS(_Nb)>
|
|
{
|
|
private:
|
|
typedef _Base_bitset<_GLIBCXX_BITSET_WORDS(_Nb)> _Base;
|
|
typedef unsigned long _WordT;
|
|
|
|
void
|
|
_M_do_sanitize()
|
|
{
|
|
_Sanitize<_Nb%_GLIBCXX_BITSET_BITS_PER_WORD>::
|
|
_S_do_sanitize(this->_M_hiword());
|
|
}
|
|
|
|
public:
|
|
/**
|
|
* This encapsulates the concept of a single bit. An instance of this
|
|
* class is a proxy for an actual bit; this way the individual bit
|
|
* operations are done as faster word-size bitwise instructions.
|
|
*
|
|
* Most users will never need to use this class directly; conversions
|
|
* to and from bool are automatic and should be transparent. Overloaded
|
|
* operators help to preserve the illusion.
|
|
*
|
|
* (On a typical system, this "bit %reference" is 64 times the size of
|
|
* an actual bit. Ha.)
|
|
*/
|
|
class reference
|
|
{
|
|
friend class bitset;
|
|
|
|
_WordT *_M_wp;
|
|
size_t _M_bpos;
|
|
|
|
// left undefined
|
|
reference();
|
|
|
|
public:
|
|
reference(bitset& __b, size_t __pos)
|
|
{
|
|
_M_wp = &__b._M_getword(__pos);
|
|
_M_bpos = _Base::_S_whichbit(__pos);
|
|
}
|
|
|
|
~reference() { }
|
|
|
|
// For b[i] = __x;
|
|
reference&
|
|
operator=(bool __x)
|
|
{
|
|
if ( __x )
|
|
*_M_wp |= _Base::_S_maskbit(_M_bpos);
|
|
else
|
|
*_M_wp &= ~_Base::_S_maskbit(_M_bpos);
|
|
return *this;
|
|
}
|
|
|
|
// For b[i] = b[__j];
|
|
reference&
|
|
operator=(const reference& __j)
|
|
{
|
|
if ( (*(__j._M_wp) & _Base::_S_maskbit(__j._M_bpos)) )
|
|
*_M_wp |= _Base::_S_maskbit(_M_bpos);
|
|
else
|
|
*_M_wp &= ~_Base::_S_maskbit(_M_bpos);
|
|
return *this;
|
|
}
|
|
|
|
// Flips the bit
|
|
bool
|
|
operator~() const
|
|
{ return (*(_M_wp) & _Base::_S_maskbit(_M_bpos)) == 0; }
|
|
|
|
// For __x = b[i];
|
|
operator bool() const
|
|
{ return (*(_M_wp) & _Base::_S_maskbit(_M_bpos)) != 0; }
|
|
|
|
// For b[i].flip();
|
|
reference&
|
|
flip()
|
|
{
|
|
*_M_wp ^= _Base::_S_maskbit(_M_bpos);
|
|
return *this;
|
|
}
|
|
};
|
|
friend class reference;
|
|
|
|
// 23.3.5.1 constructors:
|
|
/// All bits set to zero.
|
|
bitset() { }
|
|
|
|
/// Initial bits bitwise-copied from a single word (others set to zero).
|
|
bitset(unsigned long __val) : _Base(__val)
|
|
{ _M_do_sanitize(); }
|
|
|
|
/**
|
|
* @brief Use a subset of a string.
|
|
* @param s A string of '0' and '1' characters.
|
|
* @param position Index of the first character in @a s to use; defaults
|
|
* to zero.
|
|
* @throw std::out_of_range If @a pos is bigger the size of @a s.
|
|
* @throw std::invalid_argument If a character appears in the string
|
|
* which is neither '0' nor '1'.
|
|
*/
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
explicit bitset(const basic_string<_CharT, _Traits, _Alloc>& __s,
|
|
size_t __position = 0) : _Base()
|
|
{
|
|
if (__position > __s.size())
|
|
__throw_out_of_range(__N("bitset::bitset initial position "
|
|
"not valid"));
|
|
_M_copy_from_string(__s, __position,
|
|
basic_string<_CharT, _Traits, _Alloc>::npos);
|
|
}
|
|
|
|
/**
|
|
* @brief Use a subset of a string.
|
|
* @param s A string of '0' and '1' characters.
|
|
* @param position Index of the first character in @a s to use.
|
|
* @param n The number of characters to copy.
|
|
* @throw std::out_of_range If @a pos is bigger the size of @a s.
|
|
* @throw std::invalid_argument If a character appears in the string
|
|
* which is neither '0' nor '1'.
|
|
*/
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
bitset(const basic_string<_CharT, _Traits, _Alloc>& __s,
|
|
size_t __position, size_t __n) : _Base()
|
|
{
|
|
if (__position > __s.size())
|
|
__throw_out_of_range(__N("bitset::bitset initial position "
|
|
"not valid"));
|
|
_M_copy_from_string(__s, __position, __n);
|
|
}
|
|
|
|
// 23.3.5.2 bitset operations:
|
|
//@{
|
|
/**
|
|
* @brief Operations on bitsets.
|
|
* @param rhs A same-sized bitset.
|
|
*
|
|
* These should be self-explanatory.
|
|
*/
|
|
bitset<_Nb>&
|
|
operator&=(const bitset<_Nb>& __rhs)
|
|
{
|
|
this->_M_do_and(__rhs);
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
operator|=(const bitset<_Nb>& __rhs)
|
|
{
|
|
this->_M_do_or(__rhs);
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
operator^=(const bitset<_Nb>& __rhs)
|
|
{
|
|
this->_M_do_xor(__rhs);
|
|
return *this;
|
|
}
|
|
//@}
|
|
|
|
//@{
|
|
/**
|
|
* @brief Operations on bitsets.
|
|
* @param position The number of places to shift.
|
|
*
|
|
* These should be self-explanatory.
|
|
*/
|
|
bitset<_Nb>&
|
|
operator<<=(size_t __position)
|
|
{
|
|
if (__builtin_expect(__position < _Nb, 1))
|
|
{
|
|
this->_M_do_left_shift(__position);
|
|
this->_M_do_sanitize();
|
|
}
|
|
else
|
|
this->_M_do_reset();
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
operator>>=(size_t __position)
|
|
{
|
|
if (__builtin_expect(__position < _Nb, 1))
|
|
{
|
|
this->_M_do_right_shift(__position);
|
|
this->_M_do_sanitize();
|
|
}
|
|
else
|
|
this->_M_do_reset();
|
|
return *this;
|
|
}
|
|
//@}
|
|
|
|
//@{
|
|
/**
|
|
* These versions of single-bit set, reset, flip, and test are
|
|
* extensions from the SGI version. They do no range checking.
|
|
* @ingroup SGIextensions
|
|
*/
|
|
bitset<_Nb>&
|
|
_Unchecked_set(size_t __pos)
|
|
{
|
|
this->_M_getword(__pos) |= _Base::_S_maskbit(__pos);
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
_Unchecked_set(size_t __pos, int __val)
|
|
{
|
|
if (__val)
|
|
this->_M_getword(__pos) |= _Base::_S_maskbit(__pos);
|
|
else
|
|
this->_M_getword(__pos) &= ~_Base::_S_maskbit(__pos);
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
_Unchecked_reset(size_t __pos)
|
|
{
|
|
this->_M_getword(__pos) &= ~_Base::_S_maskbit(__pos);
|
|
return *this;
|
|
}
|
|
|
|
bitset<_Nb>&
|
|
_Unchecked_flip(size_t __pos)
|
|
{
|
|
this->_M_getword(__pos) ^= _Base::_S_maskbit(__pos);
|
|
return *this;
|
|
}
|
|
|
|
bool
|
|
_Unchecked_test(size_t __pos) const
|
|
{
|
|
return (this->_M_getword(__pos) & _Base::_S_maskbit(__pos))
|
|
!= static_cast<_WordT>(0);
|
|
}
|
|
//@}
|
|
|
|
// Set, reset, and flip.
|
|
/**
|
|
* @brief Sets every bit to true.
|
|
*/
|
|
bitset<_Nb>&
|
|
set()
|
|
{
|
|
this->_M_do_set();
|
|
this->_M_do_sanitize();
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Sets a given bit to a particular value.
|
|
* @param position The index of the bit.
|
|
* @param val Either true or false, defaults to true.
|
|
* @throw std::out_of_range If @a pos is bigger the size of the %set.
|
|
*/
|
|
bitset<_Nb>&
|
|
set(size_t __position, bool __val = true)
|
|
{
|
|
if (__position >= _Nb)
|
|
__throw_out_of_range(__N("bitset::set"));
|
|
return _Unchecked_set(__position, __val);
|
|
}
|
|
|
|
/**
|
|
* @brief Sets every bit to false.
|
|
*/
|
|
bitset<_Nb>&
|
|
reset()
|
|
{
|
|
this->_M_do_reset();
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Sets a given bit to false.
|
|
* @param position The index of the bit.
|
|
* @throw std::out_of_range If @a pos is bigger the size of the %set.
|
|
*
|
|
* Same as writing @c set(pos,false).
|
|
*/
|
|
bitset<_Nb>&
|
|
reset(size_t __position)
|
|
{
|
|
if (__position >= _Nb)
|
|
__throw_out_of_range(__N("bitset::reset"));
|
|
return _Unchecked_reset(__position);
|
|
}
|
|
|
|
/**
|
|
* @brief Toggles every bit to its opposite value.
|
|
*/
|
|
bitset<_Nb>&
|
|
flip()
|
|
{
|
|
this->_M_do_flip();
|
|
this->_M_do_sanitize();
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief Toggles a given bit to its opposite value.
|
|
* @param position The index of the bit.
|
|
* @throw std::out_of_range If @a pos is bigger the size of the %set.
|
|
*/
|
|
bitset<_Nb>&
|
|
flip(size_t __position)
|
|
{
|
|
if (__position >= _Nb)
|
|
__throw_out_of_range(__N("bitset::flip"));
|
|
return _Unchecked_flip(__position);
|
|
}
|
|
|
|
/// See the no-argument flip().
|
|
bitset<_Nb>
|
|
operator~() const { return bitset<_Nb>(*this).flip(); }
|
|
|
|
//@{
|
|
/**
|
|
* @brief Array-indexing support.
|
|
* @param position Index into the %bitset.
|
|
* @return A bool for a 'const %bitset'. For non-const bitsets, an
|
|
* instance of the reference proxy class.
|
|
* @note These operators do no range checking and throw no exceptions,
|
|
* as required by DR 11 to the standard.
|
|
*
|
|
* @if maint
|
|
* _GLIBCXX_RESOLVE_LIB_DEFECTS Note that this implementation already
|
|
* resolves DR 11 (items 1 and 2), but does not do the range-checking
|
|
* required by that DR's resolution. -pme
|
|
* The DR has since been changed: range-checking is a precondition
|
|
* (users' responsibility), and these functions must not throw. -pme
|
|
* @endif
|
|
*/
|
|
reference
|
|
operator[](size_t __position) { return reference(*this,__position); }
|
|
|
|
bool
|
|
operator[](size_t __position) const { return _Unchecked_test(__position); }
|
|
//@}
|
|
|
|
/**
|
|
* @brief Retuns a numerical interpretation of the %bitset.
|
|
* @return The integral equivalent of the bits.
|
|
* @throw std::overflow_error If there are too many bits to be
|
|
* represented in an @c unsigned @c long.
|
|
*/
|
|
unsigned long
|
|
to_ulong() const { return this->_M_do_to_ulong(); }
|
|
|
|
/**
|
|
* @brief Retuns a character interpretation of the %bitset.
|
|
* @return The string equivalent of the bits.
|
|
*
|
|
* Note the ordering of the bits: decreasing character positions
|
|
* correspond to increasing bit positions (see the main class notes for
|
|
* an example).
|
|
*
|
|
* Also note that you must specify the string's template parameters
|
|
* explicitly. Given a bitset @c bs and a string @s:
|
|
* @code
|
|
* s = bs.to_string<char,char_traits<char>,allocator<char> >();
|
|
* @endcode
|
|
*/
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
basic_string<_CharT, _Traits, _Alloc>
|
|
to_string() const
|
|
{
|
|
basic_string<_CharT, _Traits, _Alloc> __result;
|
|
_M_copy_to_string(__result);
|
|
return __result;
|
|
}
|
|
|
|
// Helper functions for string operations.
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
void
|
|
_M_copy_from_string(const basic_string<_CharT,_Traits,_Alloc>& __s,
|
|
size_t, size_t);
|
|
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
void
|
|
_M_copy_to_string(basic_string<_CharT,_Traits,_Alloc>&) const;
|
|
|
|
/// Returns the number of bits which are set.
|
|
size_t
|
|
count() const { return this->_M_do_count(); }
|
|
|
|
/// Returns the total number of bits.
|
|
size_t
|
|
size() const { return _Nb; }
|
|
|
|
//@{
|
|
/// These comparisons for equality/inequality are, well, @e bitwise.
|
|
bool
|
|
operator==(const bitset<_Nb>& __rhs) const
|
|
{ return this->_M_is_equal(__rhs); }
|
|
|
|
bool
|
|
operator!=(const bitset<_Nb>& __rhs) const
|
|
{ return !this->_M_is_equal(__rhs); }
|
|
//@}
|
|
|
|
/**
|
|
* @brief Tests the value of a bit.
|
|
* @param position The index of a bit.
|
|
* @return The value at @a pos.
|
|
* @throw std::out_of_range If @a pos is bigger the size of the %set.
|
|
*/
|
|
bool
|
|
test(size_t __position) const
|
|
{
|
|
if (__position >= _Nb)
|
|
__throw_out_of_range(__N("bitset::test"));
|
|
return _Unchecked_test(__position);
|
|
}
|
|
|
|
/**
|
|
* @brief Tests whether any of the bits are on.
|
|
* @return True if at least one bit is set.
|
|
*/
|
|
bool
|
|
any() const { return this->_M_is_any(); }
|
|
|
|
/**
|
|
* @brief Tests whether any of the bits are on.
|
|
* @return True if none of the bits are set.
|
|
*/
|
|
bool
|
|
none() const { return !this->_M_is_any(); }
|
|
|
|
//@{
|
|
/// Self-explanatory.
|
|
bitset<_Nb>
|
|
operator<<(size_t __position) const
|
|
{ return bitset<_Nb>(*this) <<= __position; }
|
|
|
|
bitset<_Nb>
|
|
operator>>(size_t __position) const
|
|
{ return bitset<_Nb>(*this) >>= __position; }
|
|
//@}
|
|
|
|
/**
|
|
* @brief Finds the index of the first "on" bit.
|
|
* @return The index of the first bit set, or size() if not found.
|
|
* @ingroup SGIextensions
|
|
* @sa _Find_next
|
|
*/
|
|
size_t
|
|
_Find_first() const
|
|
{ return this->_M_do_find_first(_Nb); }
|
|
|
|
/**
|
|
* @brief Finds the index of the next "on" bit after prev.
|
|
* @return The index of the next bit set, or size() if not found.
|
|
* @param prev Where to start searching.
|
|
* @ingroup SGIextensions
|
|
* @sa _Find_first
|
|
*/
|
|
size_t
|
|
_Find_next(size_t __prev ) const
|
|
{ return this->_M_do_find_next(__prev, _Nb); }
|
|
};
|
|
|
|
// Definitions of non-inline member functions.
|
|
template<size_t _Nb>
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
void
|
|
bitset<_Nb>::_M_copy_from_string(const basic_string<_CharT, _Traits,
|
|
_Alloc>& __s, size_t __pos, size_t __n)
|
|
{
|
|
reset();
|
|
const size_t __nbits = std::min(_Nb, std::min(__n, __s.size() - __pos));
|
|
for (size_t __i = 0; __i < __nbits; ++__i)
|
|
{
|
|
switch(__s[__pos + __nbits - __i - 1])
|
|
{
|
|
case '0':
|
|
break;
|
|
case '1':
|
|
set(__i);
|
|
break;
|
|
default:
|
|
__throw_invalid_argument(__N("bitset::_M_copy_from_string"));
|
|
}
|
|
}
|
|
}
|
|
|
|
template<size_t _Nb>
|
|
template<class _CharT, class _Traits, class _Alloc>
|
|
void
|
|
bitset<_Nb>::_M_copy_to_string(basic_string<_CharT, _Traits,
|
|
_Alloc>& __s) const
|
|
{
|
|
__s.assign(_Nb, '0');
|
|
for (size_t __i = 0; __i < _Nb; ++__i)
|
|
if (_Unchecked_test(__i))
|
|
__s[_Nb - 1 - __i] = '1';
|
|
}
|
|
|
|
// 23.3.5.3 bitset operations:
|
|
//@{
|
|
/**
|
|
* @brief Global bitwise operations on bitsets.
|
|
* @param x A bitset.
|
|
* @param y A bitset of the same size as @a x.
|
|
* @return A new bitset.
|
|
*
|
|
* These should be self-explanatory.
|
|
*/
|
|
template<size_t _Nb>
|
|
inline bitset<_Nb>
|
|
operator&(const bitset<_Nb>& __x, const bitset<_Nb>& __y)
|
|
{
|
|
bitset<_Nb> __result(__x);
|
|
__result &= __y;
|
|
return __result;
|
|
}
|
|
|
|
template<size_t _Nb>
|
|
inline bitset<_Nb>
|
|
operator|(const bitset<_Nb>& __x, const bitset<_Nb>& __y)
|
|
{
|
|
bitset<_Nb> __result(__x);
|
|
__result |= __y;
|
|
return __result;
|
|
}
|
|
|
|
template <size_t _Nb>
|
|
inline bitset<_Nb>
|
|
operator^(const bitset<_Nb>& __x, const bitset<_Nb>& __y)
|
|
{
|
|
bitset<_Nb> __result(__x);
|
|
__result ^= __y;
|
|
return __result;
|
|
}
|
|
//@}
|
|
|
|
//@{
|
|
/**
|
|
* @brief Global I/O operators for bitsets.
|
|
*
|
|
* Direct I/O between streams and bitsets is supported. Output is
|
|
* straightforward. Input will skip whitespace, only accept '0' and '1'
|
|
* characters, and will only extract as many digits as the %bitset will
|
|
* hold.
|
|
*/
|
|
template<class _CharT, class _Traits, size_t _Nb>
|
|
basic_istream<_CharT, _Traits>&
|
|
operator>>(basic_istream<_CharT, _Traits>& __is, bitset<_Nb>& __x)
|
|
{
|
|
typedef typename _Traits::char_type char_type;
|
|
basic_string<_CharT, _Traits> __tmp;
|
|
__tmp.reserve(_Nb);
|
|
|
|
ios_base::iostate __state = ios_base::goodbit;
|
|
typename basic_istream<_CharT, _Traits>::sentry __sentry(__is);
|
|
if (__sentry)
|
|
{
|
|
try
|
|
{
|
|
basic_streambuf<_CharT, _Traits>* __buf = __is.rdbuf();
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 303. Bitset input operator underspecified
|
|
const char_type __zero = __is.widen('0');
|
|
const char_type __one = __is.widen('1');
|
|
for (size_t __i = 0; __i < _Nb; ++__i)
|
|
{
|
|
static typename _Traits::int_type __eof = _Traits::eof();
|
|
|
|
typename _Traits::int_type __c1 = __buf->sbumpc();
|
|
if (_Traits::eq_int_type(__c1, __eof))
|
|
{
|
|
__state |= ios_base::eofbit;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
char_type __c2 = _Traits::to_char_type(__c1);
|
|
if (__c2 == __zero)
|
|
__tmp.push_back('0');
|
|
else if (__c2 == __one)
|
|
__tmp.push_back('1');
|
|
else if (_Traits::eq_int_type(__buf->sputbackc(__c2),
|
|
__eof))
|
|
{
|
|
__state |= ios_base::failbit;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
catch(...)
|
|
{ __is._M_setstate(ios_base::badbit); }
|
|
}
|
|
|
|
if (__tmp.empty() && _Nb)
|
|
__state |= ios_base::failbit;
|
|
else
|
|
__x._M_copy_from_string(__tmp, static_cast<size_t>(0), _Nb);
|
|
if (__state)
|
|
__is.setstate(__state);
|
|
return __is;
|
|
}
|
|
|
|
template <class _CharT, class _Traits, size_t _Nb>
|
|
basic_ostream<_CharT, _Traits>&
|
|
operator<<(basic_ostream<_CharT, _Traits>& __os, const bitset<_Nb>& __x)
|
|
{
|
|
basic_string<_CharT, _Traits> __tmp;
|
|
__x._M_copy_to_string(__tmp);
|
|
return __os << __tmp;
|
|
}
|
|
//@}
|
|
} // namespace std
|
|
|
|
#undef _GLIBCXX_BITSET_WORDS
|
|
#undef _GLIBCXX_BITSET_BITS_PER_WORD
|
|
|
|
#ifdef _GLIBCXX_DEBUG
|
|
# include <debug/bitset>
|
|
#endif
|
|
|
|
#endif /* _GLIBCXX_BITSET */
|