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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; (noexcept since C++11) (constexpr 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 <bitset> #include <iostream> 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 2024.06.10 std::bitset::count(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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