FreeBSD Manual Pages
std::bitset::bitset(3) C++ Standard Libary std::bitset::bitset(3) NAME std::bitset::bitset - std::bitset::bitset Synopsis bitset(); (until C++11) constexpr bitset() noexcept; (since C++11) bitset( unsigned long val ); (until C++11) constexpr bitset( unsigned long long val ) (since noexcept; C++11) template< class CharT, class Traits, class Alloc > explicit bitset( const std::basic_string<CharT,Traits,Alloc>& str, typename (until std::basic_string<CharT,Traits,Alloc>::size_type C++11) pos = 0, typename std::basic_string<CharT,Traits,Alloc>::size_type n = std::basic_string<CharT,Traits,Alloc>::npos ); template< class CharT, class Traits, class Alloc (1) > (2) explicit bitset( const std::basic_string<CharT,Traits,Alloc>& str, (3) (since typename C++11) std::basic_string<CharT,Traits,Alloc>::size_type (constexpr pos = 0, since typename C++23) std::basic_string<CharT,Traits,Alloc>::size_type n = std::basic_string<CharT,Traits,Alloc>::npos, CharT zero = CharT('0'), CharT one = CharT('1') ); template< class CharT > (since explicit bitset( const CharT* str, C++11) typename std::basic_string<CharT>::size_type (4) (constexpr n = std::basic_string<CharT>::npos, since CharT zero = CharT('0'), C++23) CharT one = CharT('1') ); Constructs a new bitset from one of several optional data sources: 1) Default constructor. Constructs a bitset with all bits set to zero. 2) Constructs a bitset, initializing the first (rightmost, least significant) M bit positions to the corresponding bit values of val, where M is the smaller of the number of bits in an unsigned long long and the number of bits N in the bitset being constructed. If M is less than N (the bitset is longer than 32 (until C++11) 64 (since C++11) bits, for typical implementations of unsigned long (since C++11)long), the remaining bit positions are initialized to zeroes. 3) Constructs a bitset using the characters in the std::basic_string str. An optional starting position pos and length n can be provided, as well as characters denoting alternate values for set (one) and unset (zero) bits. Traits::eq() is used to compare the character values. The effective length of the initializing string is min(n, str.size() - pos). If pos > str.size(), this constructor throws std::out_of_range. If any characters examined in str are not zero or one, it throws std::invalid_argu- ment. 4) Similar to (3), but uses a CharT* instead of a std::basic_string. Equivalent to bitset(n == basic_string<CharT>::npos ? basic_string<CharT>(str) : basic_string<CharT>(str, n), 0, n, zero, one) Parameters val - number used to initialize the bitset str - string used to initialize the bitset pos - a starting offset into str n - number of characters to use from str one - alternate character for set bits in str zero - alternate character for unset bits in str Exceptions 3) std::out_of_range if pos > str.size(), std::invalid_argument if any character is not one or zero 4) std::invalid_argument if any character is not one or zero Example // Run this code #include <bitset> #include <string> #include <iostream> #include <climits> int main() { // empty constructor std::bitset<8> b1; // [0,0,0,0,0,0,0,0] // unsigned long long constructor std::bitset<8> b2(42); // [0,0,1,0,1,0,1,0] std::bitset<70> bl(ULLONG_MAX); // [0,0,0,0,0,0,1,1,1,...,1,1,1] in C++11 std::bitset<8> bs(0xfff0); // [1,1,1,1,0,0,0,0] // string constructor std::string bit_string = "110010"; std::bitset<8> b3(bit_string); // [0,0,1,1,0,0,1,0] std::bitset<8> b4(bit_string, 2); // [0,0,0,0,0,0,1,0] std::bitset<8> b5(bit_string, 2, 3); // [0,0,0,0,0,0,0,1] // string constructor using custom zero/one digits std::string alpha_bit_string = "aBaaBBaB"; std::bitset<8> b6(alpha_bit_string, 0, alpha_bit_string.size(), 'a', 'B'); // [0,1,0,0,1,1,0,1] // char* constructor using custom digits std::bitset<8> b7("XXXXYYYY", 8, 'X', 'Y'); // [0,0,0,0,1,1,1,1] std::cout << "b1: " << b1 << "\nb2: " << b2 << "\nbl: " << bl << "\nbs: " << bs << "\nb3: " << b3 << "\nb4: " << b4 << "\nb5: " << b5 << "\nb6: " << b6 << "\nb7: " << b7 << '\n'; } Possible output: b1: 00000000 b2: 00101010 bl: 0000001111111111111111111111111111111111111111111111111111111111111111 bs: 11110000 b3: 00110010 b4: 00000010 b5: 00000001 b6: 01001101 b7: 00001111 See also set sets bits to true or given value (public member function) reset sets bits to false (public member function) http://cppreference.com 2022.07.31 std::bitset::bitset(3)
NAME | Synopsis | Parameters | Exceptions | Example | Possible output: | See also
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=std::bitset::bitset&sektion=3&manpath=FreeBSD+Ports+15.0>