C++ STL 中的 bitset 用法

#include <iostream> #include <bitset> int main() { std::bitset<8> bs(8); std::cout << "输出所有binary bit: " << bs << std::endl; std::cout << "bitset - any() 是否存在置为1的bit: " << std::boolalpha << bs.any() << std::noboolalpha << std::endl; std::cout << "bitset - none() 是否不存在置为 1 的bit: " << bs.none() << std::endl; std::cout << "bitset - count() bit为 1 的个数: " << bs.count() << std::endl; std::cout << "bitset - size() bit的个数: " << bs.size() << std::endl; bs.flip(); std::cout << "bitset - flip() 把所有bit逐位取反 后: " << bs << std::endl; bs.flip(0); std::cout << "bitset - flip(size_t pos) 把在pos(zero-based)处的bit 按位取反 后: " << bs << std::endl; std::cout << "bitset - [] 使用[]操作符访问pos处的bit: " << bs[0] << std::endl; bs.set(); std::cout << "bitset - set() 把所有的bit都置为1: " << bs << std::endl; bs.set(0); std::cout << "bitset - set(size_t pos) 把pos处的bit置为1: " << bs << std::endl; std::cout << "bitset - test(size_t pos) 测试pos处的bit是否为1: " << std::boolalpha << bs.test(0) << std::noboolalpha << std::endl; std::cout << "bitset - to_ulong() 返回一个unsigned long值: " << bs.to_ulong() << std::endl; std::cout << "bitset - to_string() 返回一个std::string值: " << bs.to_string() << std::endl; return 0; }

 

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