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std::countr_zero(3) C++ Standard Libary std::countr_zero(3) NAME std::countr_zero - std::countr_zero Synopsis Defined in header <bit> template< class T > (since C++20) constexpr int countr_zero( T x ) noexcept; Returns the number of consecutive 0 bits in the value of x, starting from the least significant bit ("right"). This overload participates in overload resolution only if T is an unsigned integer type (that is, unsigned char, unsigned short, unsigned int, unsigned long, unsigned long long, or an extended unsigned integer type). Parameters x - value of unsigned integer type Return value The number of consecutive 0 bits in the value of x, starting from the least significant bit. Notes Feature-test macro: __cpp_lib_bitops Example // Run this code #include <bit> #include <bitset> #include <cstdint> #include <iostream> int main() { for (const std::uint8_t i : { 0, 0b11111111, 0b00011100, 0b00011101 }) { std::cout << "countr_zero( " << std::bitset<8>(i) << " ) = " << std::countr_zero(i) << '\n'; } } Output: countr_zero( 00000000 ) = 8 countr_zero( 11111111 ) = 0 countr_zero( 00011100 ) = 2 countr_zero( 00011101 ) = 0 See also countl_zero counts the number of consecutive 0 bits, starting from the most (C++20) significant bit (function template) countl_one counts the number of consecutive 1 bits, starting from the most (C++20) significant bit (function template) countr_one counts the number of consecutive 1 bits, starting from the least (C++20) significant bit (function template) popcount counts the number of 1 bits in an unsigned integer (C++20) (function template) all any checks if all, any or none of the bits are set to true none (public member function of std::bitset<N>) (C++11) http://cppreference.com 2022.07.31 std::countr_zero(3)
NAME | Synopsis | Parameters | Return value | Notes | Example | Output: | See also
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