操作符重载调用优先级

先粗略记一下。。。。

对同一个操作符同时实现成员函数重载和友元重载时，优先调用成员重载，当不存在成员重载时调用友元重载

#include "stdafx.h"

class CTest {
public:
    CTest(int nValue) : nValue_(nValue) {}

    friend bool operator ==(const CTest& t1, const CTest& t2) {
        return t1.nValue_ == t2.nValue_;
    }

    bool operator == (const CTest& t) {
        return nValue_ == t.nValue_;
    }

private:
    int nValue_;
};

int _tmain(int argc, _TCHAR* argv[])
{
    CTest t1(1);
    CTest t2(2);
    bool bSame = t1 == t2;
    bSame = t1.operator==(t2);
    bSame = operator == (t1, t2);
    return 0;
}