dynamic_bitset.tcc
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// TR2 <dynamic_bitset> -*- C++ -*-
// Copyright (C) 2009-2023 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/>.
/** @file tr2/dynamic_bitset.tcc
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{tr2/dynamic_bitset}
*/
#ifndef _GLIBCXX_TR2_DYNAMIC_BITSET_TCC
#define _GLIBCXX_TR2_DYNAMIC_BITSET_TCC 1
#pragma GCC system_header
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace tr2
{
// Definitions of non-inline functions from __dynamic_bitset_base.
template<typename _WordT, typename _Alloc>
void
__dynamic_bitset_base<_WordT, _Alloc>::_M_do_left_shift(size_t __shift)
{
if (__builtin_expect(__shift != 0, 1))
{
const size_t __wshift = __shift / _S_bits_per_block;
const size_t __offset = __shift % _S_bits_per_block;
if (__offset == 0)
for (size_t __n = this->_M_w.size() - 1; __n >= __wshift; --__n)
this->_M_w[__n] = this->_M_w[__n - __wshift];
else
{
const size_t __sub_offset = _S_bits_per_block - __offset;
for (size_t __n = _M_w.size() - 1; __n > __wshift; --__n)
this->_M_w[__n] = ((this->_M_w[__n - __wshift] << __offset)
| (this->_M_w[__n - __wshift - 1] >> __sub_offset));
this->_M_w[__wshift] = this->_M_w[0] << __offset;
}
std::fill_n(this->_M_w.begin(), __wshift, _WordT(0));
}
}
template<typename _WordT, typename _Alloc>
void
__dynamic_bitset_base<_WordT, _Alloc>::_M_do_right_shift(size_t __shift)
{
if (__builtin_expect(__shift != 0, 1))
{
const size_t __wshift = __shift / _S_bits_per_block;
const size_t __offset = __shift % _S_bits_per_block;
const size_t __limit = this->_M_w.size() - __wshift - 1;
if (__offset == 0)
for (size_t __n = 0; __n <= __limit; ++__n)
this->_M_w[__n] = this->_M_w[__n + __wshift];
else
{
const size_t __sub_offset = (_S_bits_per_block
- __offset);
for (size_t __n = 0; __n < __limit; ++__n)
this->_M_w[__n] = ((this->_M_w[__n + __wshift] >> __offset)
| (this->_M_w[__n + __wshift + 1] << __sub_offset));
this->_M_w[__limit] = this->_M_w[_M_w.size()-1] >> __offset;
}
std::fill_n(this->_M_w.end() - __wshift, __wshift, _WordT(0));
}
}
template<typename _WordT, typename _Alloc>
unsigned long
__dynamic_bitset_base<_WordT, _Alloc>::_M_do_to_ulong() const
{
size_t __n = sizeof(unsigned long) / sizeof(block_type);
for (size_t __i = __n; __i < this->_M_w.size(); ++__i)
if (this->_M_w[__i])
__throw_overflow_error(__N("__dynamic_bitset_base::_M_do_to_ulong"));
unsigned long __res = 0UL;
for (size_t __i = 0; __i < __n && __i < this->_M_w.size(); ++__i)
__res += this->_M_w[__i] << (__i * _S_bits_per_block);
return __res;
}
template<typename _WordT, typename _Alloc>
unsigned long long
__dynamic_bitset_base<_WordT, _Alloc>::_M_do_to_ullong() const
{
size_t __n = sizeof(unsigned long long) / sizeof(block_type);
for (size_t __i = __n; __i < this->_M_w.size(); ++__i)
if (this->_M_w[__i])
__throw_overflow_error(__N("__dynamic_bitset_base::_M_do_to_ullong"));
unsigned long long __res = 0ULL;
for (size_t __i = 0; __i < __n && __i < this->_M_w.size(); ++__i)
__res += this->_M_w[__i] << (__i * _S_bits_per_block);
return __res;
}
template<typename _WordT, typename _Alloc>
size_t
__dynamic_bitset_base<_WordT, _Alloc>
::_M_do_find_first(size_t __not_found) const
{
for (size_t __i = 0; __i < this->_M_w.size(); ++__i)
{
_WordT __thisword = this->_M_w[__i];
if (__thisword != static_cast<_WordT>(0))
return (__i * _S_bits_per_block
+ __builtin_ctzll(__thisword));
}
// not found, so return an indication of failure.
return __not_found;
}
template<typename _WordT, typename _Alloc>
size_t
__dynamic_bitset_base<_WordT, _Alloc>
::_M_do_find_next(size_t __prev, size_t __not_found) const
{
// make bound inclusive
++__prev;
// check out of bounds
if (__prev >= this->_M_w.size() * _S_bits_per_block)
return __not_found;
// search first word
size_t __i = _S_whichword(__prev);
_WordT __thisword = this->_M_w[__i];
// mask off bits below bound
__thisword &= (~static_cast<_WordT>(0)) << _S_whichbit(__prev);
if (__thisword != static_cast<_WordT>(0))
return (__i * _S_bits_per_block
+ __builtin_ctzll(__thisword));
// check subsequent words
for (++__i; __i < this->_M_w.size(); ++__i)
{
__thisword = this->_M_w[__i];
if (__thisword != static_cast<_WordT>(0))
return (__i * _S_bits_per_block
+ __builtin_ctzll(__thisword));
}
// not found, so return an indication of failure.
return __not_found;
} // end _M_do_find_next
// Definitions of non-inline member functions.
template<typename _WordT, typename _Alloc>
template<typename _Traits, typename _CharT>
void
dynamic_bitset<_WordT, _Alloc>::
_M_copy_from_ptr(const _CharT* __str, size_t __len,
size_t __pos, size_t __n, _CharT __zero, _CharT __one)
{
reset();
const size_t __nbits = std::min(_M_Nb, std::min(__n, __len - __pos));
for (size_t __i = __nbits; __i > 0; --__i)
{
const _CharT __c = __str[__pos + __nbits - __i];
if (_Traits::eq(__c, __zero))
;
else if (_Traits::eq(__c, __one))
_M_unchecked_set(__i - 1);
else
__throw_invalid_argument(__N("dynamic_bitset::_M_copy_from_ptr"));
}
}
/**
* @brief Stream input operator for dynamic_bitset.
* @ingroup dynamic_bitset
*
* Input will skip whitespace and only accept '0' and '1' characters.
* The %dynamic_bitset will grow as necessary to hold the string of bits.
*/
template<typename _CharT, typename _Traits,
typename _WordT, typename _Alloc>
std::basic_istream<_CharT, _Traits>&
operator>>(std::basic_istream<_CharT, _Traits>& __is,
dynamic_bitset<_WordT, _Alloc>& __x)
{
typedef typename _Traits::char_type char_type;
typedef std::basic_istream<_CharT, _Traits> __istream_type;
typedef typename __istream_type::ios_base __ios_base;
std::basic_string<_CharT, _Traits> __tmp;
__tmp.reserve(__x.size());
const char_type __zero = __is.widen('0');
const char_type __one = __is.widen('1');
typename __ios_base::iostate __state = __ios_base::goodbit;
typename __istream_type::sentry __sentry(__is);
if (__sentry)
{
__try
{
while (1)
{
static typename _Traits::int_type __eof = _Traits::eof();
typename _Traits::int_type __c1 = __is.rdbuf()->sbumpc();
if (_Traits::eq_int_type(__c1, __eof))
{
__state |= __ios_base::eofbit;
break;
}
else
{
const char_type __c2 = _Traits::to_char_type(__c1);
if (_Traits::eq(__c2, __zero))
__tmp.push_back(__zero);
else if (_Traits::eq(__c2, __one))
__tmp.push_back(__one);
else if (_Traits::
eq_int_type(__is.rdbuf()->sputbackc(__c2),
__eof))
{
__state |= __ios_base::failbit;
break;
}
else
break;
}
}
}
__catch(__cxxabiv1::__forced_unwind&)
{
__is._M_setstate(__ios_base::badbit);
__throw_exception_again;
}
__catch(...)
{ __is._M_setstate(__ios_base::badbit); }
}
__x.resize(__tmp.size());
if (__tmp.empty() && __x.size())
__state |= __ios_base::failbit;
else
__x._M_copy_from_string(__tmp, static_cast<size_t>(0), __x.size(),
__zero, __one);
if (__state)
__is.setstate(__state);
return __is;
}
} // tr2
_GLIBCXX_END_NAMESPACE_VERSION
} // std
#endif /* _GLIBCXX_TR2_DYNAMIC_BITSET_TCC */
std::min
constexpr const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
Definition stl_algobase.h:233
std::tr2::operator>>
std::basic_istream< _CharT, _Traits > & operator>>(std::basic_istream< _CharT, _Traits > &__is, dynamic_bitset< _WordT, _Alloc > &__x)
Stream input operator for dynamic_bitset.
Definition dynamic_bitset.tcc:205
std
ISO C++ entities toplevel namespace is std.
std::tr2
Namespace for non-standard "TR2" extensions.
std::basic_ios::setstate
void setstate(iostate __state)
Sets additional flags in the error state.
Definition basic_ios.h:157
std::basic_ios::widen
char_type widen(char __c) const
Widens characters.
Definition basic_ios.h:449
std::basic_ios::rdbuf
basic_streambuf< _CharT, _Traits > * rdbuf() const
Accessing the underlying buffer.
Definition basic_ios.h:321
std::basic_istream
Template class basic_istream.
Definition istream:61
std::basic_string
Managing sequences of characters and character-like objects.
Definition basic_string.h:88
std::basic_string::size
constexpr size_type size() const noexcept
Returns the number of characters in the string, not including any null-termination.
Definition basic_string.h:1071
std::basic_string::reserve
constexpr void reserve(size_type __res_arg)
Attempt to preallocate enough memory for specified number of characters.
Definition cow_string.h:3485
std::basic_string::push_back
constexpr void push_back(_CharT __c)
Append a single character.
Definition basic_string.h:1561
std::basic_string::empty
constexpr bool empty() const noexcept
Definition basic_string.h:1220
__cxxabiv1::__forced_unwind
Thrown as part of forced unwinding.
Definition cxxabi_forced.h:49
std::tr2::__dynamic_bitset_base
Definition dynamic_bitset:63
std::tr2::dynamic_bitset
The dynamic_bitset class represents a sequence of bits.
Definition dynamic_bitset:421
std::tr2::dynamic_bitset::resize
void resize(size_type __nbits, bool __value=false)
Resize the bitset.
Definition dynamic_bitset:688
std::tr2::dynamic_bitset::size
size_type size() const noexcept
Returns the total number of bits.
Definition dynamic_bitset:994