c++里位运算符的一个比较常见的用法_C/C++_编程开发_程序员俱乐部

#include "stdafx.h"
#include <iostream>

#define  L8        1
#define  L16       2
#define  L32       4
#define  L64       8
#define  COMPLEX   0x10
#define  FLOAT     0x20
#define  SIGN      0x40

// 数值类型
enum type
{
    t_8u    =  L8,                    //8位无符号整型
    t_8s    =  L8  | SIGN,            //8位有符号整型
    t_8sc   =  L8  | SIGN | COMPLEX,  //8位有符号（整）复数
    t_8f    =  L8  | SIGN | FLOAT,    //8位有符号浮点数
    t_16u   =  L16,                   //16位无符号整数
    t_16s   =  L16 | SIGN,            //16位有符号整数
    t_16sc  =  L16 | SIGN | COMPLEX,  //16位有符号（整）复数
    t_16f   =  L16 | SIGN | FLOAT     //16位有符号浮点数
    // and so on
};

using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    type t;
    t = t_8f;
    cout << "8L?"      << bool(t & L8)      << "\n"
         << "sign?"    << bool(t & SIGN)    << "\n"
         << "float?"   << bool(t & FLOAT)   << "\n"
         << "complex?" << bool(t & COMPLEX) << endl;
    return 0;
}