c++ 位操作

<span style="font-size:18px;">// bit_opt.cpp : 定义控制台应用程序的入口点。///************************************************************************//*author:郑金玮time:2014/07/14desc:impl bit set and clear test demo*//************************************************************************/#include "stdafx.h"#include <process.h>#include <iostream>using namespace std;#define bit_move_left(bit) (1<<(bit) )class CBitOpt{public:CBitOpt(){cout<<"construct function called."<<endl<<endl;}~CBitOpt(){cout<<"destructrut function called."<<endl<<endl;}public:enum eBitTag{bit_share=bit_move_left(1),bit_private=bit_move_left(31),bit_count=2};void setbit(eBitTag bit){ m_nBit = m_nBit | bit; }void clearbit(eBitTag bit) { m_nBit = m_nBit & ~bit ;}bool checkbit(eBitTag bit) { return m_nBit & bit ;}void clear() { m_nBit = 0x0000;}private: int m_nBit;};int _tmain(int argc, _TCHAR* argv[]){CBitOpt bitoptobj;bitoptobj.setbit(CBitOpt::bit_private);bitoptobj.setbit(CBitOpt::bit_share);if (bitoptobj.checkbit(CBitOpt::bit_private)){cout<<"this tag has private bit"<<endl;}else{cout<<"this tag has not  private bit"<<endl;}if (bitoptobj.checkbit(CBitOpt::bit_share)){cout<<"this tag has share bit "<<endl;}else{cout<<"this tag has not share bit "<<endl;}cout<<endl<<endl<<endl<<"==============after clear bit==========="<<endl<<endl<<endl;bitoptobj.clearbit(CBitOpt::bit_private);if (bitoptobj.checkbit(CBitOpt::bit_private)){cout<<"this tag has private bit"<<endl;}else{cout<<"this tag has not  private bit"<<endl;}if (bitoptobj.checkbit(CBitOpt::bit_share)){cout<<"this tag has share bit "<<endl;}else{cout<<"this tag has not share bit "<<endl;}cout<<endl<<endl<<endl<<"--------------after clear all bits----------"<<endl<<endl<<endl;bitoptobj.clear();if (bitoptobj.checkbit(CBitOpt::bit_private)){cout<<"this tag has private bit"<<endl;}else{cout<<"this tag has not  private bit"<<endl;}if (bitoptobj.checkbit(CBitOpt::bit_share)){cout<<"this tag has share bit "<<endl;}else{cout<<"this tag has not share bit "<<endl;}system("pause");return 0;}</span>