boost/dynamic_bitset/dynamic_bitset.hpp
// ----------------------------------------------------------- // // Copyright (c) 2001-2002 Chuck Allison and Jeremy Siek // Copyright (c) 2003-2006, 2008 Gennaro Prota // Copyright (c) 2014 Ahmed Charles // // Copyright (c) 2014 Glen Joseph Fernandes // glenfe at live dot com // Copyright (c) 2014 Riccardo Marcangelo // // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // // ----------------------------------------------------------- #ifndef BOOST_DYNAMIC_BITSET_DYNAMIC_BITSET_HPP #define BOOST_DYNAMIC_BITSET_DYNAMIC_BITSET_HPP #include <assert.h> #include <string> #include <stdexcept> #include <algorithm> #include <vector> #include <climits> // for CHAR_BIT #include "boost/dynamic_bitset/config.hpp" #ifndef BOOST_NO_STD_LOCALE # include <locale> #endif #if defined(BOOST_OLD_IOSTREAMS) # include <iostream.h> # include <ctype.h> // for isspace #else # include <istream> # include <ostream> #endif #include "boost/dynamic_bitset_fwd.hpp" #include "boost/detail/dynamic_bitset.hpp" #include "boost/detail/iterator.hpp" // used to implement append(Iter, Iter) #include "boost/move/move.hpp" #include "boost/limits.hpp" #include "boost/pending/lowest_bit.hpp" #include "boost/static_assert.hpp" #include "boost/utility/addressof.hpp" #include "boost/detail/no_exceptions_support.hpp" #include "boost/throw_exception.hpp" namespace boost { template <typename Block, typename Allocator> class dynamic_bitset { // Portability note: member function templates are defined inside // this class definition to avoid problems with VC++. Similarly, // with the member functions of nested classes. // // [October 2008: the note above is mostly historical; new versions // of VC++ are likely able to digest a more drinking form of the // code; but changing it now is probably not worth the risks...] BOOST_STATIC_ASSERT((bool)detail::dynamic_bitset_impl::allowed_block_type<Block>::value); typedef std::vector<Block, Allocator> buffer_type; public: typedef Block block_type; typedef Allocator allocator_type; typedef std::size_t size_type; typedef typename buffer_type::size_type block_width_type; BOOST_STATIC_CONSTANT(block_width_type, bits_per_block = (std::numeric_limits<Block>::digits)); BOOST_STATIC_CONSTANT(size_type, npos = static_cast<size_type>(-1)); public: // A proxy class to simulate lvalues of bit type. // class reference { friend class dynamic_bitset<Block, Allocator>; // the one and only non-copy ctor reference(block_type & b, block_type pos) :m_block(b), m_mask( (assert(pos < bits_per_block), block_type(1) << pos ) ) { } void operator&(); // left undefined public: // copy constructor: compiler generated operator bool() const { return (m_block & m_mask) != 0; } bool operator~() const { return (m_block & m_mask) == 0; } reference& flip() { do_flip(); return *this; } reference& operator=(bool x) { do_assign(x); return *this; } // for b[i] = x reference& operator=(const reference& rhs) { do_assign(rhs); return *this; } // for b[i] = b[j] reference& operator|=(bool x) { if (x) do_set(); return *this; } reference& operator&=(bool x) { if (!x) do_reset(); return *this; } reference& operator^=(bool x) { if (x) do_flip(); return *this; } reference& operator-=(bool x) { if (x) do_reset(); return *this; } private: block_type & m_block; const block_type m_mask; void do_set() { m_block |= m_mask; } void do_reset() { m_block &= ~m_mask; } void do_flip() { m_block ^= m_mask; } void do_assign(bool x) { x? do_set() : do_reset(); } }; typedef bool const_reference; // constructors, etc. explicit dynamic_bitset(const Allocator& alloc = Allocator()); explicit dynamic_bitset(size_type num_bits, unsigned long value = 0, const Allocator& alloc = Allocator()); // WARNING: you should avoid using this constructor. // // A conversion from string is, in most cases, formatting, // and should be performed by using operator>>. // // NOTE: // Leave the parentheses around std::basic_string<CharT, Traits, Alloc>::npos. // g++ 3.2 requires them and probably the standard will - see core issue 325 // NOTE 2: // split into two constructors because of bugs in MSVC 6.0sp5 with STLport template <typename CharT, typename Traits, typename Alloc> dynamic_bitset(const std::basic_string<CharT, Traits, Alloc>& s, typename std::basic_string<CharT, Traits, Alloc>::size_type pos, typename std::basic_string<CharT, Traits, Alloc>::size_type n, size_type num_bits = npos, const Allocator& alloc = Allocator()) :m_bits(alloc), m_num_bits(0) { init_from_string(s, pos, n, num_bits); } template <typename CharT, typename Traits, typename Alloc> explicit dynamic_bitset(const std::basic_string<CharT, Traits, Alloc>& s, typename std::basic_string<CharT, Traits, Alloc>::size_type pos = 0) :m_bits(Allocator()), m_num_bits(0) { init_from_string(s, pos, (std::basic_string<CharT, Traits, Alloc>::npos), npos); } // The first bit in *first is the least significant bit, and the // last bit in the block just before *last is the most significant bit. template <typename BlockInputIterator> dynamic_bitset(BlockInputIterator first, BlockInputIterator last, const Allocator& alloc = Allocator()) :m_bits(alloc), m_num_bits(0) { using boost::detail::dynamic_bitset_impl::value_to_type; using boost::detail::dynamic_bitset_impl::is_numeric; const value_to_type< is_numeric<BlockInputIterator>::value> selector; dispatch_init(first, last, selector); } template <typename T> void dispatch_init(T num_bits, unsigned long value, detail::dynamic_bitset_impl::value_to_type<true>) { init_from_unsigned_long(static_cast<size_type>(num_bits), value); } template <typename T> void dispatch_init(T first, T last, detail::dynamic_bitset_impl::value_to_type<false>) { init_from_block_range(first, last); } template <typename BlockIter> void init_from_block_range(BlockIter first, BlockIter last) { assert(m_bits.size() == 0); m_bits.insert(m_bits.end(), first, last); m_num_bits = m_bits.size() * bits_per_block; } // copy constructor dynamic_bitset(const dynamic_bitset& b); ~dynamic_bitset(); void swap(dynamic_bitset& b); dynamic_bitset& operator=(const dynamic_bitset& b); #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES dynamic_bitset(dynamic_bitset&& src); dynamic_bitset& operator=(dynamic_bitset&& src); #endif // BOOST_NO_CXX11_RVALUE_REFERENCES allocator_type get_allocator() const; // size changing operations void resize(size_type num_bits, bool value = false); void clear(); void push_back(bool bit); void pop_back(); void append(Block block); template <typename BlockInputIterator> void m_append(BlockInputIterator first, BlockInputIterator last, std::input_iterator_tag) { std::vector<Block, Allocator> v(first, last); m_append(v.begin(), v.end(), std::random_access_iterator_tag()); } template <typename BlockInputIterator> void m_append(BlockInputIterator first, BlockInputIterator last, std::forward_iterator_tag) { assert(first != last); block_width_type r = count_extra_bits(); std::size_t d = boost::detail::distance(first, last); m_bits.reserve(num_blocks() + d); if (r == 0) { for( ; first != last; ++first) m_bits.push_back(*first); // could use vector<>::insert() } else { m_highest_block() |= (*first << r); do { Block b = *first >> (bits_per_block - r); ++first; m_bits.push_back(b | (first==last? 0 : *first << r)); } while (first != last); } m_num_bits += bits_per_block * d; } template <typename BlockInputIterator> void append(BlockInputIterator first, BlockInputIterator last) // strong guarantee { if (first != last) { typename detail::iterator_traits<BlockInputIterator>::iterator_category cat; m_append(first, last, cat); } } // bitset operations dynamic_bitset& operator&=(const dynamic_bitset& b); dynamic_bitset& operator|=(const dynamic_bitset& b); dynamic_bitset& operator^=(const dynamic_bitset& b); dynamic_bitset& operator-=(const dynamic_bitset& b); dynamic_bitset& operator<<=(size_type n); dynamic_bitset& operator>>=(size_type n); dynamic_bitset operator<<(size_type n) const; dynamic_bitset operator>>(size_type n) const; // basic bit operations dynamic_bitset& set(size_type n, bool val = true); dynamic_bitset& set(); dynamic_bitset& reset(size_type n); dynamic_bitset& reset(); dynamic_bitset& flip(size_type n); dynamic_bitset& flip(); bool test(size_type n) const; bool test_set(size_type n, bool val = true); bool all() const; bool any() const; bool none() const; dynamic_bitset operator~() const; size_type count() const BOOST_NOEXCEPT; // subscript reference operator[](size_type pos) { return reference(m_bits[block_index(pos)], bit_index(pos)); } bool operator[](size_type pos) const { return test(pos); } unsigned long to_ulong() const; size_type size() const BOOST_NOEXCEPT; size_type num_blocks() const BOOST_NOEXCEPT; size_type max_size() const BOOST_NOEXCEPT; bool empty() const BOOST_NOEXCEPT; size_type capacity() const BOOST_NOEXCEPT; void reserve(size_type num_bits); void shrink_to_fit(); bool is_subset_of(const dynamic_bitset& a) const; bool is_proper_subset_of(const dynamic_bitset& a) const; bool intersects(const dynamic_bitset & a) const; // lookup size_type find_first() const; size_type find_next(size_type pos) const; #if !defined BOOST_DYNAMIC_BITSET_DONT_USE_FRIENDS // lexicographical comparison template <typename B, typename A> friend bool operator==(const dynamic_bitset<B, A>& a, const dynamic_bitset<B, A>& b); template <typename B, typename A> friend bool operator<(const dynamic_bitset<B, A>& a, const dynamic_bitset<B, A>& b); template <typename B, typename A, typename BlockOutputIterator> friend void to_block_range(const dynamic_bitset<B, A>& b, BlockOutputIterator result); template <typename BlockIterator, typename B, typename A> friend void from_block_range(BlockIterator first, BlockIterator last, dynamic_bitset<B, A>& result); template <typename CharT, typename Traits, typename B, typename A> friend std::basic_istream<CharT, Traits>& operator>>(std::basic_istream<CharT, Traits>& is, dynamic_bitset<B, A>& b); template <typename B, typename A, typename stringT> friend void to_string_helper(const dynamic_bitset<B, A> & b, stringT & s, bool dump_all); #endif private: BOOST_STATIC_CONSTANT(block_width_type, ulong_width = std::numeric_limits<unsigned long>::digits); void m_zero_unused_bits(); bool m_check_invariants() const; size_type m_do_find_from(size_type first_block) const; block_width_type count_extra_bits() const BOOST_NOEXCEPT { return bit_index(size()); } static size_type block_index(size_type pos) BOOST_NOEXCEPT { return pos / bits_per_block; } static block_width_type bit_index(size_type pos) BOOST_NOEXCEPT { return static_cast<block_width_type>(pos % bits_per_block); } static Block bit_mask(size_type pos) BOOST_NOEXCEPT { return Block(1) << bit_index(pos); } template <typename CharT, typename Traits, typename Alloc> void init_from_string(const std::basic_string<CharT, Traits, Alloc>& s, typename std::basic_string<CharT, Traits, Alloc>::size_type pos, typename std::basic_string<CharT, Traits, Alloc>::size_type n, size_type num_bits) { assert(pos <= s.size()); typedef typename std::basic_string<CharT, Traits, Alloc> StrT; typedef typename StrT::traits_type Tr; const typename StrT::size_type rlen = (std::min)(n, s.size() - pos); const size_type sz = ( num_bits != npos? num_bits : rlen); m_bits.resize(calc_num_blocks(sz)); m_num_bits = sz; BOOST_DYNAMIC_BITSET_CTYPE_FACET(CharT, fac, std::locale()); const CharT one = BOOST_DYNAMIC_BITSET_WIDEN_CHAR(fac, '1'); const size_type m = num_bits < rlen ? num_bits : rlen; typename StrT::size_type i = 0; for( ; i < m; ++i) { const CharT c = s[(pos + m - 1) - i]; assert( Tr::eq(c, one) || Tr::eq(c, BOOST_DYNAMIC_BITSET_WIDEN_CHAR(fac, '0')) ); if (Tr::eq(c, one)) set(i); } } void init_from_unsigned_long(size_type num_bits, unsigned long value/*, const Allocator& alloc*/) { assert(m_bits.size() == 0); m_bits.resize(calc_num_blocks(num_bits)); m_num_bits = num_bits; typedef unsigned long num_type; typedef boost::detail::dynamic_bitset_impl ::shifter<num_type, bits_per_block, ulong_width> shifter; //if (num_bits == 0) // return; // zero out all bits at pos >= num_bits, if any; // note that: num_bits == 0 implies value == 0 if (num_bits < static_cast<size_type>(ulong_width)) { const num_type mask = (num_type(1) << num_bits) - 1; value &= mask; } typename buffer_type::iterator it = m_bits.begin(); for( ; value; shifter::left_shift(value), ++it) { *it = static_cast<block_type>(value); } } BOOST_DYNAMIC_BITSET_PRIVATE: bool m_unchecked_test(size_type pos) const; static size_type calc_num_blocks(size_type num_bits); Block& m_highest_block(); const Block& m_highest_block() const; buffer_type m_bits; size_type m_num_bits; class bit_appender; friend class bit_appender; class bit_appender { // helper for stream >> // Supplies to the lack of an efficient append at the less // significant end: bits are actually appended "at left" but // rearranged in the destructor. From the perspective of // client code everything works *as if* dynamic_bitset<> had // an append_at_right() function (eventually throwing the same // exceptions as push_back) except that the function is in fact // called bit_appender::do_append(). // dynamic_bitset & bs; size_type n; Block mask; Block * current; // not implemented bit_appender(const bit_appender &); bit_appender & operator=(const bit_appender &); public: bit_appender(dynamic_bitset & r) : bs(r), n(0), mask(0), current(0) {} ~bit_appender() { // reverse the order of blocks, shift // if needed, and then resize // std::reverse(bs.m_bits.begin(), bs.m_bits.end()); const block_width_type offs = bit_index(n); if (offs) bs >>= (bits_per_block - offs); bs.resize(n); // doesn't enlarge, so can't throw assert(bs.m_check_invariants()); } inline void do_append(bool value) { if (mask == 0) { bs.append(Block(0)); current = &bs.m_highest_block(); mask = Block(1) << (bits_per_block - 1); } if(value) *current |= mask; mask /= 2; ++n; } size_type get_count() const { return n; } }; }; #if !defined BOOST_NO_INCLASS_MEMBER_INITIALIZATION template <typename Block, typename Allocator> const typename dynamic_bitset<Block, Allocator>::block_width_type dynamic_bitset<Block, Allocator>::bits_per_block; template <typename Block, typename Allocator> const typename dynamic_bitset<Block, Allocator>::size_type dynamic_bitset<Block, Allocator>::npos; template <typename Block, typename Allocator> const typename dynamic_bitset<Block, Allocator>::block_width_type dynamic_bitset<Block, Allocator>::ulong_width; #endif // Global Functions: // comparison template <typename Block, typename Allocator> bool operator!=(const dynamic_bitset<Block, Allocator>& a, const dynamic_bitset<Block, Allocator>& b); template <typename Block, typename Allocator> bool operator<=(const dynamic_bitset<Block, Allocator>& a, const dynamic_bitset<Block, Allocator>& b); template <typename Block, typename Allocator> bool operator>(const dynamic_bitset<Block, Allocator>& a, const dynamic_bitset<Block, Allocator>& b); template <typename Block, typename Allocator> bool operator>=(const dynamic_bitset<Block, Allocator>& a, const dynamic_bitset<Block, Allocator>& b); // stream operators #ifdef BOOST_OLD_IOSTREAMS template <typename Block, typename Allocator> std::ostream& operator<<(std::ostream& os, const dynamic_bitset<Block, Allocator>& b); template <typename Block, typename Allocator> std::istream& operator>>(std::istream& is, dynamic_bitset<Block,Allocator>& b); #else template <typename CharT, typename Traits, typename Block, typename Allocator> std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os, const dynamic_bitset<Block, Allocator>& b); template <typename CharT, typename Traits, typename Block, typename Allocator> std::basic_istream<CharT, Traits>& operator>>(std::basic_istream<CharT, Traits>& is, dynamic_bitset<Block, Allocator>& b); #endif // bitset operations template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator> operator&(const dynamic_bitset<Block, Allocator>& b1, const dynamic_bitset<Block, Allocator>& b2); template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator> operator|(const dynamic_bitset<Block, Allocator>& b1, const dynamic_bitset<Block, Allocator>& b2); template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator> operator^(const dynamic_bitset<Block, Allocator>& b1, const dynamic_bitset<Block, Allocator>& b2); template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator> operator-(const dynamic_bitset<Block, Allocator>& b1, const dynamic_bitset<Block, Allocator>& b2); // namespace scope swap template<typename Block, typename Allocator> void swap(dynamic_bitset<Block, Allocator>& b1, dynamic_bitset<Block, Allocator>& b2); template <typename Block, typename Allocator, typename stringT> void to_string(const dynamic_bitset<Block, Allocator>& b, stringT & s); template <typename Block, typename Allocator, typename BlockOutputIterator> void to_block_range(const dynamic_bitset<Block, Allocator>& b, BlockOutputIterator result); template <typename BlockIterator, typename B, typename A> inline void from_block_range(BlockIterator first, BlockIterator last, dynamic_bitset<B, A>& result) { // PRE: distance(first, last) <= numblocks() std::copy (first, last, result.m_bits.begin()); } //============================================================================= // dynamic_bitset implementation //----------------------------------------------------------------------------- // constructors, etc. template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>::dynamic_bitset(const Allocator& alloc) : m_bits(alloc), m_num_bits(0) { } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>:: dynamic_bitset(size_type num_bits, unsigned long value, const Allocator& alloc) : m_bits(alloc), m_num_bits(0) { init_from_unsigned_long(num_bits, value); } // copy constructor template <typename Block, typename Allocator> inline dynamic_bitset<Block, Allocator>:: dynamic_bitset(const dynamic_bitset& b) : m_bits(b.m_bits), m_num_bits(b.m_num_bits) { } template <typename Block, typename Allocator> inline dynamic_bitset<Block, Allocator>:: ~dynamic_bitset() { assert(m_check_invariants()); } template <typename Block, typename Allocator> inline void dynamic_bitset<Block, Allocator>:: swap(dynamic_bitset<Block, Allocator>& b) // no throw { std::swap(m_bits, b.m_bits); std::swap(m_num_bits, b.m_num_bits); } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>:: operator=(const dynamic_bitset<Block, Allocator>& b) { m_bits = b.m_bits; m_num_bits = b.m_num_bits; return *this; } #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES template <typename Block, typename Allocator> inline dynamic_bitset<Block, Allocator>:: dynamic_bitset(dynamic_bitset<Block, Allocator>&& b) : m_bits(boost::move(b.m_bits)), m_num_bits(boost::move(b.m_num_bits)) { // Required so that assert(m_check_invariants()); works. assert((b.m_bits = buffer_type()).empty()); b.m_num_bits = 0; } template <typename Block, typename Allocator> inline dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>:: operator=(dynamic_bitset<Block, Allocator>&& b) { if (boost::addressof(b) == this) { return *this; } m_bits = boost::move(b.m_bits); m_num_bits = boost::move(b.m_num_bits); // Required so that assert(m_check_invariants()); works. assert((b.m_bits = buffer_type()).empty()); b.m_num_bits = 0; return *this; } #endif // BOOST_NO_CXX11_RVALUE_REFERENCES template <typename Block, typename Allocator> inline typename dynamic_bitset<Block, Allocator>::allocator_type dynamic_bitset<Block, Allocator>::get_allocator() const { return m_bits.get_allocator(); } //----------------------------------------------------------------------------- // size changing operations template <typename Block, typename Allocator> void dynamic_bitset<Block, Allocator>:: resize(size_type num_bits, bool value) // strong guarantee { const size_type old_num_blocks = num_blocks(); const size_type required_blocks = calc_num_blocks(num_bits); const block_type v = value? ~Block(0) : Block(0); if (required_blocks != old_num_blocks) { m_bits.resize(required_blocks, v); // s.g. (copy) } // At this point: // // - if the buffer was shrunk, we have nothing more to do, // except a call to m_zero_unused_bits() // // - if it was enlarged, all the (used) bits in the new blocks have // the correct value, but we have not yet touched those bits, if // any, that were 'unused bits' before enlarging: if value == true, // they must be set. if (value && (num_bits > m_num_bits)) { const block_width_type extra_bits = count_extra_bits(); if (extra_bits) { assert(old_num_blocks >= 1 && old_num_blocks <= m_bits.size()); // Set them. m_bits[old_num_blocks - 1] |= (v << extra_bits); } } m_num_bits = num_bits; m_zero_unused_bits(); } template <typename Block, typename Allocator> void dynamic_bitset<Block, Allocator>:: clear() // no throw { m_bits.clear(); m_num_bits = 0; } template <typename Block, typename Allocator> void dynamic_bitset<Block, Allocator>:: push_back(bool bit) { const size_type sz = size(); resize(sz + 1); set(sz, bit); } template <typename Block, typename Allocator> void dynamic_bitset<Block, Allocator>:: pop_back() { const size_type old_num_blocks = num_blocks(); const size_type required_blocks = calc_num_blocks(m_num_bits - 1); if (required_blocks != old_num_blocks) { m_bits.pop_back(); } --m_num_bits; m_zero_unused_bits(); } template <typename Block, typename Allocator> void dynamic_bitset<Block, Allocator>:: append(Block value) // strong guarantee { const block_width_type r = count_extra_bits(); if (r == 0) { // the buffer is empty, or all blocks are filled m_bits.push_back(value); } else { m_bits.push_back(value >> (bits_per_block - r)); m_bits[m_bits.size() - 2] |= (value << r); // m_bits.size() >= 2 } m_num_bits += bits_per_block; assert(m_check_invariants()); } //----------------------------------------------------------------------------- // bitset operations template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>::operator&=(const dynamic_bitset& rhs) { assert(size() == rhs.size()); for (size_type i = 0; i < num_blocks(); ++i) m_bits[i] &= rhs.m_bits[i]; return *this; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>::operator|=(const dynamic_bitset& rhs) { assert(size() == rhs.size()); for (size_type i = 0; i < num_blocks(); ++i) m_bits[i] |= rhs.m_bits[i]; //m_zero_unused_bits(); return *this; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>::operator^=(const dynamic_bitset& rhs) { assert(size() == rhs.size()); for (size_type i = 0; i < this->num_blocks(); ++i) m_bits[i] ^= rhs.m_bits[i]; //m_zero_unused_bits(); return *this; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>::operator-=(const dynamic_bitset& rhs) { assert(size() == rhs.size()); for (size_type i = 0; i < num_blocks(); ++i) m_bits[i] &= ~rhs.m_bits[i]; //m_zero_unused_bits(); return *this; } // // NOTE: // Note that the 'if (r != 0)' is crucial to avoid undefined // behavior when the left hand operand of >> isn't promoted to a // wider type (because rs would be too large). // template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>::operator<<=(size_type n) { if (n >= m_num_bits) return reset(); //else if (n > 0) { size_type const last = num_blocks() - 1; // num_blocks() is >= 1 size_type const div = n / bits_per_block; // div is <= last block_width_type const r = bit_index(n); block_type * const b = &m_bits[0]; if (r != 0) { block_width_type const rs = bits_per_block - r; for (size_type i = last-div; i>0; --i) { b[i+div] = (b[i] << r) | (b[i-1] >> rs); } b[div] = b[0] << r; } else { for (size_type i = last-div; i>0; --i) { b[i+div] = b[i]; } b[div] = b[0]; } // zero out div blocks at the less significant end std::fill_n(m_bits.begin(), div, static_cast<block_type>(0)); // zero out any 1 bit that flowed into the unused part m_zero_unused_bits(); // thanks to Lester Gong } return *this; } // // NOTE: // see the comments to operator <<= // template <typename B, typename A> dynamic_bitset<B, A> & dynamic_bitset<B, A>::operator>>=(size_type n) { if (n >= m_num_bits) { return reset(); } //else if (n>0) { size_type const last = num_blocks() - 1; // num_blocks() is >= 1 size_type const div = n / bits_per_block; // div is <= last block_width_type const r = bit_index(n); block_type * const b = &m_bits[0]; if (r != 0) { block_width_type const ls = bits_per_block - r; for (size_type i = div; i < last; ++i) { b[i-div] = (b[i] >> r) | (b[i+1] << ls); } // r bits go to zero b[last-div] = b[last] >> r; } else { for (size_type i = div; i <= last; ++i) { b[i-div] = b[i]; } // note the '<=': the last iteration 'absorbs' // b[last-div] = b[last] >> 0; } // div blocks are zero filled at the most significant end std::fill_n(m_bits.begin() + (num_blocks()-div), div, static_cast<block_type>(0)); } return *this; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator> dynamic_bitset<Block, Allocator>::operator<<(size_type n) const { dynamic_bitset r(*this); return r <<= n; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator> dynamic_bitset<Block, Allocator>::operator>>(size_type n) const { dynamic_bitset r(*this); return r >>= n; } //----------------------------------------------------------------------------- // basic bit operations template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>::set(size_type pos, bool val) { assert(pos < m_num_bits); if (val) m_bits[block_index(pos)] |= bit_mask(pos); else reset(pos); return *this; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>::set() { std::fill(m_bits.begin(), m_bits.end(), ~Block(0)); m_zero_unused_bits(); return *this; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>::reset(size_type pos) { assert(pos < m_num_bits); #if defined __MWERKS__ && BOOST_WORKAROUND(__MWERKS__, <= 0x3003) // 8.x // CodeWarrior 8 generates incorrect code when the &=~ is compiled, // use the |^ variation instead.. <grafik> m_bits[block_index(pos)] |= bit_mask(pos); m_bits[block_index(pos)] ^= bit_mask(pos); #else m_bits[block_index(pos)] &= ~bit_mask(pos); #endif return *this; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>::reset() { std::fill(m_bits.begin(), m_bits.end(), Block(0)); return *this; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>::flip(size_type pos) { assert(pos < m_num_bits); m_bits[block_index(pos)] ^= bit_mask(pos); return *this; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator>& dynamic_bitset<Block, Allocator>::flip() { for (size_type i = 0; i < num_blocks(); ++i) m_bits[i] = ~m_bits[i]; m_zero_unused_bits(); return *this; } template <typename Block, typename Allocator> bool dynamic_bitset<Block, Allocator>::m_unchecked_test(size_type pos) const { return (m_bits[block_index(pos)] & bit_mask(pos)) != 0; } template <typename Block, typename Allocator> bool dynamic_bitset<Block, Allocator>::test(size_type pos) const { assert(pos < m_num_bits); return m_unchecked_test(pos); } template <typename Block, typename Allocator> bool dynamic_bitset<Block, Allocator>::test_set(size_type pos, bool val) { bool const b = test(pos); if (b != val) { set(pos, val); } return b; } template <typename Block, typename Allocator> bool dynamic_bitset<Block, Allocator>::all() const { if (empty()) { return true; } const block_width_type extra_bits = count_extra_bits(); block_type const all_ones = ~static_cast<Block>(0); if (extra_bits == 0) { for (size_type i = 0, e = num_blocks(); i < e; ++i) { if (m_bits[i] != all_ones) { return false; } } } else { for (size_type i = 0, e = num_blocks() - 1; i < e; ++i) { if (m_bits[i] != all_ones) { return false; } } block_type const mask = ~(~static_cast<Block>(0) << extra_bits); if (m_highest_block() != mask) { return false; } } return true; } template <typename Block, typename Allocator> bool dynamic_bitset<Block, Allocator>::any() const { for (size_type i = 0; i < num_blocks(); ++i) if (m_bits[i]) return true; return false; } template <typename Block, typename Allocator> inline bool dynamic_bitset<Block, Allocator>::none() const { return !any(); } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator> dynamic_bitset<Block, Allocator>::operator~() const { dynamic_bitset b(*this); b.flip(); return b; } template <typename Block, typename Allocator> typename dynamic_bitset<Block, Allocator>::size_type dynamic_bitset<Block, Allocator>::count() const BOOST_NOEXCEPT { using detail::dynamic_bitset_impl::table_width; using detail::dynamic_bitset_impl::access_by_bytes; using detail::dynamic_bitset_impl::access_by_blocks; using detail::dynamic_bitset_impl::value_to_type; #if BOOST_WORKAROUND(__GNUC__, == 4) && (__GNUC_MINOR__ == 3) && (__GNUC_PATCHLEVEL__ == 3) // NOTE: Explicit qualification of "bits_per_block" // breaks compilation on gcc 4.3.3 enum { no_padding = bits_per_block == CHAR_BIT * sizeof(Block) }; #else // NOTE: Explicitly qualifying "bits_per_block" to workaround // regressions of gcc 3.4.x enum { no_padding = dynamic_bitset<Block, Allocator>::bits_per_block == CHAR_BIT * sizeof(Block) }; #endif enum { enough_table_width = table_width >= CHAR_BIT }; enum { mode = (no_padding && enough_table_width) ? access_by_bytes : access_by_blocks }; return do_count(m_bits.begin(), num_blocks(), Block(0), static_cast<value_to_type<(bool)mode> *>(0)); } //----------------------------------------------------------------------------- // conversions template <typename B, typename A, typename stringT> void to_string_helper(const dynamic_bitset<B, A> & b, stringT & s, bool dump_all) { typedef typename stringT::traits_type Tr; typedef typename stringT::value_type Ch; BOOST_DYNAMIC_BITSET_CTYPE_FACET(Ch, fac, std::locale()); const Ch zero = BOOST_DYNAMIC_BITSET_WIDEN_CHAR(fac, '0'); const Ch one = BOOST_DYNAMIC_BITSET_WIDEN_CHAR(fac, '1'); // Note that this function may access (when // dump_all == true) bits beyond position size() - 1 typedef typename dynamic_bitset<B, A>::size_type size_type; const size_type len = dump_all? dynamic_bitset<B, A>::bits_per_block * b.num_blocks(): b.size(); s.assign (len, zero); for (size_type i = 0; i < len; ++i) { if (b.m_unchecked_test(i)) Tr::assign(s[len - 1 - i], one); } } // A comment similar to the one about the constructor from // basic_string can be done here. Thanks to James Kanze for // making me (Gennaro) realize this important separation of // concerns issue, as well as many things about i18n. // template <typename Block, typename Allocator, typename stringT> inline void to_string(const dynamic_bitset<Block, Allocator>& b, stringT& s) { to_string_helper(b, s, false); } // Differently from to_string this function dumps out // every bit of the internal representation (may be // useful for debugging purposes) // template <typename B, typename A, typename stringT> inline void dump_to_string(const dynamic_bitset<B, A>& b, stringT& s) { to_string_helper(b, s, true /* =dump_all*/); } template <typename Block, typename Allocator, typename BlockOutputIterator> inline void to_block_range(const dynamic_bitset<Block, Allocator>& b, BlockOutputIterator result) { // note how this copies *all* bits, including the // unused ones in the last block (which are zero) std::copy(b.m_bits.begin(), b.m_bits.end(), result); } template <typename Block, typename Allocator> unsigned long dynamic_bitset<Block, Allocator>:: to_ulong() const { if (m_num_bits == 0) return 0; // convention // Check for overflows. This may be a performance burden on very // large bitsets but is required by the specification, sorry if (find_next(ulong_width - 1) != npos) BOOST_THROW_EXCEPTION(std::overflow_error("boost::dynamic_bitset::to_ulong overflow")); // Ok, from now on we can be sure there's no "on" bit // beyond the "allowed" positions typedef unsigned long result_type; const size_type maximum_size = (std::min)(m_num_bits, static_cast<size_type>(ulong_width)); const size_type last_block = block_index( maximum_size - 1 ); assert((last_block * bits_per_block) < static_cast<size_type>(ulong_width)); result_type result = 0; for (size_type i = 0; i <= last_block; ++i) { const size_type offset = i * bits_per_block; result |= (static_cast<result_type>(m_bits[i]) << offset); } return result; } template <typename Block, typename Allocator> inline typename dynamic_bitset<Block, Allocator>::size_type dynamic_bitset<Block, Allocator>::size() const BOOST_NOEXCEPT { return m_num_bits; } template <typename Block, typename Allocator> inline typename dynamic_bitset<Block, Allocator>::size_type dynamic_bitset<Block, Allocator>::num_blocks() const BOOST_NOEXCEPT { return m_bits.size(); } template <typename Block, typename Allocator> inline typename dynamic_bitset<Block, Allocator>::size_type dynamic_bitset<Block, Allocator>::max_size() const BOOST_NOEXCEPT { // Semantics of vector<>::max_size() aren't very clear // (see lib issue 197) and many library implementations // simply return dummy values, _unrelated_ to the underlying // allocator. // // Given these problems, I was tempted to not provide this // function at all but the user could need it if he provides // his own allocator. // const size_type m = detail::dynamic_bitset_impl:: vector_max_size_workaround(m_bits); return m <= (size_type(-1)/bits_per_block) ? m * bits_per_block : size_type(-1); } template <typename Block, typename Allocator> inline bool dynamic_bitset<Block, Allocator>::empty() const BOOST_NOEXCEPT { return size() == 0; } template <typename Block, typename Allocator> inline typename dynamic_bitset<Block, Allocator>::size_type dynamic_bitset<Block, Allocator>::capacity() const BOOST_NOEXCEPT { return m_bits.capacity() * bits_per_block; } template <typename Block, typename Allocator> inline void dynamic_bitset<Block, Allocator>::reserve(size_type num_bits) { m_bits.reserve(calc_num_blocks(num_bits)); } template <typename Block, typename Allocator> void dynamic_bitset<Block, Allocator>::shrink_to_fit() { if (m_bits.size() < m_bits.capacity()) { buffer_type(m_bits).swap(m_bits); } } template <typename Block, typename Allocator> bool dynamic_bitset<Block, Allocator>:: is_subset_of(const dynamic_bitset<Block, Allocator>& a) const { assert(size() == a.size()); for (size_type i = 0; i < num_blocks(); ++i) if (m_bits[i] & ~a.m_bits[i]) return false; return true; } template <typename Block, typename Allocator> bool dynamic_bitset<Block, Allocator>:: is_proper_subset_of(const dynamic_bitset<Block, Allocator>& a) const { assert(size() == a.size()); assert(num_blocks() == a.num_blocks()); bool proper = false; for (size_type i = 0; i < num_blocks(); ++i) { const Block & bt = m_bits[i]; const Block & ba = a.m_bits[i]; if (bt & ~ba) return false; // not a subset at all if (ba & ~bt) proper = true; } return proper; } template <typename Block, typename Allocator> bool dynamic_bitset<Block, Allocator>::intersects(const dynamic_bitset & b) const { size_type common_blocks = num_blocks() < b.num_blocks() ? num_blocks() : b.num_blocks(); for(size_type i = 0; i < common_blocks; ++i) { if(m_bits[i] & b.m_bits[i]) return true; } return false; } // -------------------------------- // lookup // look for the first bit "on", starting // from the block with index first_block // template <typename Block, typename Allocator> typename dynamic_bitset<Block, Allocator>::size_type dynamic_bitset<Block, Allocator>::m_do_find_from(size_type first_block) const { size_type i = first_block; // skip null blocks while (i < num_blocks() && m_bits[i] == 0) ++i; if (i >= num_blocks()) return npos; // not found return i * bits_per_block + static_cast<size_type>(boost::lowest_bit(m_bits[i])); } template <typename Block, typename Allocator> typename dynamic_bitset<Block, Allocator>::size_type dynamic_bitset<Block, Allocator>::find_first() const { return m_do_find_from(0); } template <typename Block, typename Allocator> typename dynamic_bitset<Block, Allocator>::size_type dynamic_bitset<Block, Allocator>::find_next(size_type pos) const { const size_type sz = size(); if (pos >= (sz-1) || sz == 0) return npos; ++pos; const size_type blk = block_index(pos); const block_width_type ind = bit_index(pos); // shift bits upto one immediately after current const Block fore = m_bits[blk] >> ind; return fore? pos + static_cast<size_type>(lowest_bit(fore)) : m_do_find_from(blk + 1); } //----------------------------------------------------------------------------- // comparison template <typename Block, typename Allocator> bool operator==(const dynamic_bitset<Block, Allocator>& a, const dynamic_bitset<Block, Allocator>& b) { return (a.m_num_bits == b.m_num_bits) && (a.m_bits == b.m_bits); } template <typename Block, typename Allocator> inline bool operator!=(const dynamic_bitset<Block, Allocator>& a, const dynamic_bitset<Block, Allocator>& b) { return !(a == b); } template <typename Block, typename Allocator> bool operator<(const dynamic_bitset<Block, Allocator>& a, const dynamic_bitset<Block, Allocator>& b) { assert(a.size() == b.size()); typedef typename dynamic_bitset<Block, Allocator>::size_type size_type; //if (a.size() == 0) // return false; // Since we are storing the most significant bit // at pos == size() - 1, we need to do the comparisons in reverse. // for (size_type ii = a.num_blocks(); ii > 0; --ii) { size_type i = ii-1; if (a.m_bits[i] < b.m_bits[i]) return true; else if (a.m_bits[i] > b.m_bits[i]) return false; } return false; } template <typename Block, typename Allocator> inline bool operator<=(const dynamic_bitset<Block, Allocator>& a, const dynamic_bitset<Block, Allocator>& b) { return !(a > b); } template <typename Block, typename Allocator> inline bool operator>(const dynamic_bitset<Block, Allocator>& a, const dynamic_bitset<Block, Allocator>& b) { return b < a; } template <typename Block, typename Allocator> inline bool operator>=(const dynamic_bitset<Block, Allocator>& a, const dynamic_bitset<Block, Allocator>& b) { return !(a < b); } //----------------------------------------------------------------------------- // stream operations #ifdef BOOST_OLD_IOSTREAMS template < typename Block, typename Alloc> std::ostream& operator<<(std::ostream& os, const dynamic_bitset<Block, Alloc>& b) { // NOTE: since this is aimed at "classic" iostreams, exception // masks on the stream are not supported. The library that // ships with gcc 2.95 has an exceptions() member function but // nothing is actually implemented; not even the class ios::failure. using namespace std; const ios::iostate ok = ios::goodbit; ios::iostate err = ok; if (os.opfx()) { //try typedef typename dynamic_bitset<Block, Alloc>::size_type bitsetsize_type; const bitsetsize_type sz = b.size(); std::streambuf * buf = os.rdbuf(); size_t npad = os.width() <= 0 // careful: os.width() is signed (and can be < 0) || (bitsetsize_type) os.width() <= sz? 0 : os.width() - sz; const char fill_char = os.fill(); const ios::fmtflags adjustfield = os.flags() & ios::adjustfield; // if needed fill at left; pad is decresed along the way if (adjustfield != ios::left) { for (; 0 < npad; --npad) if (fill_char != buf->sputc(fill_char)) { err |= ios::failbit; break; } } if (err == ok) { // output the bitset for (bitsetsize_type i = b.size(); 0 < i; --i) { const char dig = b.test(i-1)? '1' : '0'; if (EOF == buf->sputc(dig)) { err |= ios::failbit; break; } } } if (err == ok) { // if needed fill at right for (; 0 < npad; --npad) { if (fill_char != buf->sputc(fill_char)) { err |= ios::failbit; break; } } } os.osfx(); os.width(0); } // if opfx if(err != ok) os.setstate(err); // assume this does NOT throw return os; } #else template <typename Ch, typename Tr, typename Block, typename Alloc> std::basic_ostream<Ch, Tr>& operator<<(std::basic_ostream<Ch, Tr>& os, const dynamic_bitset<Block, Alloc>& b) { using namespace std; const ios_base::iostate ok = ios_base::goodbit; ios_base::iostate err = ok; typename basic_ostream<Ch, Tr>::sentry cerberos(os); if (cerberos) { BOOST_DYNAMIC_BITSET_CTYPE_FACET(Ch, fac, os.getloc()); const Ch zero = BOOST_DYNAMIC_BITSET_WIDEN_CHAR(fac, '0'); const Ch one = BOOST_DYNAMIC_BITSET_WIDEN_CHAR(fac, '1'); BOOST_TRY { typedef typename dynamic_bitset<Block, Alloc>::size_type bitset_size_type; typedef basic_streambuf<Ch, Tr> buffer_type; buffer_type * buf = os.rdbuf(); // careful: os.width() is signed (and can be < 0) const bitset_size_type width = (os.width() <= 0) ? 0 : static_cast<bitset_size_type>(os.width()); streamsize npad = (width <= b.size()) ? 0 : width - b.size(); const Ch fill_char = os.fill(); const ios_base::fmtflags adjustfield = os.flags() & ios_base::adjustfield; // if needed fill at left; pad is decreased along the way if (adjustfield != ios_base::left) { for (; 0 < npad; --npad) if (Tr::eq_int_type(Tr::eof(), buf->sputc(fill_char))) { err |= ios_base::failbit; break; } } if (err == ok) { // output the bitset for (bitset_size_type i = b.size(); 0 < i; --i) { typename buffer_type::int_type ret = buf->sputc(b.test(i-1)? one : zero); if (Tr::eq_int_type(Tr::eof(), ret)) { err |= ios_base::failbit; break; } } } if (err == ok) { // if needed fill at right for (; 0 < npad; --npad) { if (Tr::eq_int_type(Tr::eof(), buf->sputc(fill_char))) { err |= ios_base::failbit; break; } } } os.width(0); } BOOST_CATCH (...) { // see std 27.6.1.1/4 bool rethrow = false; BOOST_TRY { os.setstate(ios_base::failbit); } BOOST_CATCH (...) { rethrow = true; } BOOST_CATCH_END if (rethrow) BOOST_RETHROW; } BOOST_CATCH_END } if(err != ok) os.setstate(err); // may throw exception return os; } #endif #ifdef BOOST_OLD_IOSTREAMS // A sentry-like class that calls isfx in its destructor. // "Necessary" because bit_appender::do_append may throw. class pseudo_sentry { std::istream & m_r; const bool m_ok; public: explicit pseudo_sentry(std::istream & r) : m_r(r), m_ok(r.ipfx(0)) { } ~pseudo_sentry() { m_r.isfx(); } operator bool() const { return m_ok; } }; template <typename Block, typename Alloc> std::istream& operator>>(std::istream& is, dynamic_bitset<Block, Alloc>& b) { // Extractor for classic IO streams (libstdc++ < 3.0) // ----------------------------------------------------// // It's assumed that the stream buffer functions, and // the stream's setstate() _cannot_ throw. typedef dynamic_bitset<Block, Alloc> bitset_type; typedef typename bitset_type::size_type size_type; std::ios::iostate err = std::ios::goodbit; pseudo_sentry cerberos(is); // skips whitespaces if(cerberos) { b.clear(); const std::streamsize w = is.width(); const size_type limit = w > 0 && static_cast<size_type>(w) < b.max_size() ? static_cast<size_type>(w) : b.max_size(); typename bitset_type::bit_appender appender(b); std::streambuf * buf = is.rdbuf(); for(int c = buf->sgetc(); appender.get_count() < limit; c = buf->snextc() ) { if (c == EOF) { err |= std::ios::eofbit; break; } else if (char(c) != '0' && char(c) != '1') break; // non digit character else { BOOST_TRY { appender.do_append(char(c) == '1'); } BOOST_CATCH(...) { is.setstate(std::ios::failbit); // assume this can't throw BOOST_RETHROW; } BOOST_CATCH_END } } // for } is.width(0); if (b.size() == 0) err |= std::ios::failbit; if (err != std::ios::goodbit) is.setstate (err); // may throw return is; } #else // BOOST_OLD_IOSTREAMS template <typename Ch, typename Tr, typename Block, typename Alloc> std::basic_istream<Ch, Tr>& operator>>(std::basic_istream<Ch, Tr>& is, dynamic_bitset<Block, Alloc>& b) { using namespace std; typedef dynamic_bitset<Block, Alloc> bitset_type; typedef typename bitset_type::size_type size_type; const streamsize w = is.width(); const size_type limit = 0 < w && static_cast<size_type>(w) < b.max_size()? static_cast<size_type>(w) : b.max_size(); ios_base::iostate err = ios_base::goodbit; typename basic_istream<Ch, Tr>::sentry cerberos(is); // skips whitespaces if(cerberos) { // in accordance with prop. resol. of lib DR 303 [last checked 4 Feb 2004] BOOST_DYNAMIC_BITSET_CTYPE_FACET(Ch, fac, is.getloc()); const Ch zero = BOOST_DYNAMIC_BITSET_WIDEN_CHAR(fac, '0'); const Ch one = BOOST_DYNAMIC_BITSET_WIDEN_CHAR(fac, '1'); b.clear(); BOOST_TRY { typename bitset_type::bit_appender appender(b); basic_streambuf <Ch, Tr> * buf = is.rdbuf(); typename Tr::int_type c = buf->sgetc(); for( ; appender.get_count() < limit; c = buf->snextc() ) { if (Tr::eq_int_type(Tr::eof(), c)) { err |= ios_base::eofbit; break; } else { const Ch to_c = Tr::to_char_type(c); const bool is_one = Tr::eq(to_c, one); if (!is_one && !Tr::eq(to_c, zero)) break; // non digit character appender.do_append(is_one); } } // for } BOOST_CATCH (...) { // catches from stream buf, or from vector: // // bits_stored bits have been extracted and stored, and // either no further character is extractable or we can't // append to the underlying vector (out of memory) bool rethrow = false; // see std 27.6.1.1/4 BOOST_TRY { is.setstate(ios_base::badbit); } BOOST_CATCH(...) { rethrow = true; } BOOST_CATCH_END if (rethrow) BOOST_RETHROW; } BOOST_CATCH_END } is.width(0); if (b.size() == 0 /*|| !cerberos*/) err |= ios_base::failbit; if (err != ios_base::goodbit) is.setstate (err); // may throw return is; } #endif //----------------------------------------------------------------------------- // bitset operations template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator> operator&(const dynamic_bitset<Block, Allocator>& x, const dynamic_bitset<Block, Allocator>& y) { dynamic_bitset<Block, Allocator> b(x); return b &= y; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator> operator|(const dynamic_bitset<Block, Allocator>& x, const dynamic_bitset<Block, Allocator>& y) { dynamic_bitset<Block, Allocator> b(x); return b |= y; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator> operator^(const dynamic_bitset<Block, Allocator>& x, const dynamic_bitset<Block, Allocator>& y) { dynamic_bitset<Block, Allocator> b(x); return b ^= y; } template <typename Block, typename Allocator> dynamic_bitset<Block, Allocator> operator-(const dynamic_bitset<Block, Allocator>& x, const dynamic_bitset<Block, Allocator>& y) { dynamic_bitset<Block, Allocator> b(x); return b -= y; } //----------------------------------------------------------------------------- // namespace scope swap template<typename Block, typename Allocator> inline void swap(dynamic_bitset<Block, Allocator>& left, dynamic_bitset<Block, Allocator>& right) // no throw { left.swap(right); } //----------------------------------------------------------------------------- // private (on conforming compilers) member functions template <typename Block, typename Allocator> inline typename dynamic_bitset<Block, Allocator>::size_type dynamic_bitset<Block, Allocator>::calc_num_blocks(size_type num_bits) { return num_bits / bits_per_block + static_cast<size_type>( num_bits % bits_per_block != 0 ); } // gives a reference to the highest block // template <typename Block, typename Allocator> inline Block& dynamic_bitset<Block, Allocator>::m_highest_block() { return const_cast<Block &> (static_cast<const dynamic_bitset *>(this)->m_highest_block()); } // gives a const-reference to the highest block // template <typename Block, typename Allocator> inline const Block& dynamic_bitset<Block, Allocator>::m_highest_block() const { assert(size() > 0 && num_blocks() > 0); return m_bits.back(); } // If size() is not a multiple of bits_per_block // then not all the bits in the last block are used. // This function resets the unused bits (convenient // for the implementation of many member functions) // template <typename Block, typename Allocator> inline void dynamic_bitset<Block, Allocator>::m_zero_unused_bits() { assert (num_blocks() == calc_num_blocks(m_num_bits)); // if != 0 this is the number of bits used in the last block const block_width_type extra_bits = count_extra_bits(); if (extra_bits != 0) m_highest_block() &= ~(~static_cast<Block>(0) << extra_bits); } // check class invariants template <typename Block, typename Allocator> bool dynamic_bitset<Block, Allocator>::m_check_invariants() const { const block_width_type extra_bits = count_extra_bits(); if (extra_bits > 0) { block_type const mask = (~static_cast<Block>(0) << extra_bits); if ((m_highest_block() & mask) != 0) return false; } if (m_bits.size() > m_bits.capacity() || num_blocks() != calc_num_blocks(size())) return false; return true; } } // namespace boost #undef BOOST_BITSET_CHAR #endif // include guard