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std::bitset::count(3) C++ Standard Libary std::bitset::count(3) NAME std::bitset::count - std::bitset::count Synopsis std::size_t count() const; (until C++11) std::size_t count() const noexcept; (since C++11) (until C++23) constexpr std::size_t count() const noexcept; (since C++23) Returns the number of bits that are set to true. Parameters (none) Return value number of bits that are set to true. Example // Run this code #include <iostream> #include <bitset> int main() { std::bitset<8> b("00010010"); std::cout << "initial value: " << b << '\n'; // find the first unset bit std::size_t idx = 0; while (idx < b.size() && b.test(idx)) ++idx; // continue setting bits until half the bitset is filled while (idx < b.size() && b.count() < b.size()/2) { b.set(idx); std::cout << "setting bit " << idx << ": " << b << '\n'; while (idx < b.size() && b.test(idx)) ++idx; } } Output: initial value: 00010010 setting bit 0: 00010011 setting bit 2: 00010111 See also size returns the number of bits that the bitset holds (public member function) popcount counts the number of 1 bits in an unsigned integer (C++20) (function template) http://cppreference.com 2022.07.31 std::bitset::count(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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