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std::bitset(3) C++ Standard Libary std::bitset(3) NAME std::bitset - std::bitset Synopsis Defined in header <bitset> template< std::size_t N > class bitset; The class template bitset represents a fixed-size sequence of N bits. Bitsets can be manipulated by standard logic operators and converted to and from strings and integers. bitset meets the requirements of CopyConstructible and CopyAssigna- ble. Template parameters N - the number of bits to allocate storage for Member types reference proxy class representing a reference to a bit (class) Member functions constructor constructs the bitset (public member function) operator== compares the contents operator!= (public member function) (removed in C++20) Element access operator[] accesses specific bit (public member function) test accesses specific bit (public member function) all any checks if all, any or none of the bits are set to true none (public member function) (C++11) count returns the number of bits set to true (public member function) Capacity size returns the number of bits that the bitset holds (public member function) Modifiers operator&= operator|= performs binary AND, OR, XOR and NOT operator^= (public member function) operator~ operator<<= operator>>= performs binary shift left and shift right operator<< (public member function) operator>> set sets bits to true or given value (public member function) reset sets bits to false (public member function) flip toggles the values of bits (public member function) Conversions to_string returns a string representation of the data (public member function) to_ulong returns an unsigned long integer representation of the data (public member function) to_ullong returns an unsigned long long integer representa- tion of the data (C++11) (public member function) Non-member functions operator& performs binary logic operations on bitsets operator| (function template) operator^ operator<< performs stream input and output of bitsets operator>> (function template) Helper classes std::hash<std::bitset> hash support for std::bitset (C++11) (class template specialization) Notes If the size of the bitset is not known at compile time, std::vec- tor<bool> or boost::dynamic_bitset<> may be used. Feature-test macro: __cpp_lib_constexpr_bitset Example // Run this code #include <bitset> #include <cstddef> #include <cassert> #include <iostream> int main() { typedef std::size_t length_t, position_t; // the hints // constructors: constexpr std::bitset<4> b1; constexpr std::bitset<4> b2{0xA}; // == 0B1010 std::bitset<4> b3{"0011"}; // can't be constexpr yet std::bitset<8> b4{"ABBA", length_t(4), /*0:*/'A', /*1:*/'B'}; // == 0B0000'0110 // bitsets can be printed out to a stream: std::cout << "b1:" << b1 << "; b2:" << b2 << "; b3:" << b3 << "; b4:" << b4 << '\n'; // bitset supports bitwise operations: b3 |= 0b0100; assert(b3 == 0b0111); b3 &= 0b0011; assert(b3 == 0b0011); b3 ^= std::bitset<4>{0b1100}; assert(b3 == 0b1111); // operations on the whole set: b3.reset(); assert(b3 == 0); b3.set(); assert(b3 == 0b1111); assert(b3.all() && b3.any() && !b3.none()); b3.flip(); assert(b3 == 0); // operations on individual bits: b3.set(position_t(1), true); assert(b3 == 0b0010); b3.set(position_t(1), false); assert(b3 == 0); b3.flip(position_t(2)); assert(b3 == 0b0100); b3.reset(position_t(2)); assert(b3 == 0); // subscript operator[] is supported: b3[2] = true; assert(true == b3[2]); // other operations: assert(b3.count() == 1); assert(b3.size() == 4); assert(b3.to_ullong() == 0b0100ULL); assert(b3.to_string() == "0100"); } Output: b1:0000; b2:1010; b3:0011; b4:00000110 See also vector<bool> space-efficient dynamic bitset (class template specialization) Bit manipulation (C++20) utilities to access, manipulate, and process individual bits and bit sequences http://cppreference.com 2022.07.31 std::bitset(3)
NAME | Synopsis | Template parameters | Member types | Member functions | Element access | Capacity | Modifiers | Conversions | Non-member functions | Helper classes | Notes | Example | Output: | See also
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