C++运算符重载+，*在QT中的实现演示

1. 创建控制台工程，工程文件如下，

//QtOperator.pro

QT -= gui

CONFIG += c++11 console

CONFIG -= app_bundle

# The following define makes your compiler emit warnings if you use

# any Qt feature that has been marked deprecated (the exact warnings

# depend on your compiler). Please consult the documentation of the

# deprecated API in order to know how to port your code away from it.

DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.

# In order to do so, uncomment the following line.

# You can also select to disable deprecated APIs only up to a certain version of Qt.

#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \

        main.cpp \

        qoperatorclass.cpp

# Default rules for deployment.

qnx: target.path = /tmp/$${TARGET}/bin

else: unix:!android: target.path = /opt/$${TARGET}/bin

!isEmpty(target.path): INSTALLS += target

HEADERS += \

    qoperatorclass.h

2.  创建操作演示类

//qoperatorclass.h

#ifndef QOPERATORCLASS_H

#define QOPERATORCLASS_H

class QOperatorClass

{

public:

    QOperatorClass();

    QOperatorClass operator+(const QOperatorClass &rc) const;

    QOperatorClass operator*(int m);

    void help();

private:

    int m_op1;

    int m_op2;

};

#endif // QOPERATORCLASS_H

//qoperatorclass.cpp

#include "qoperatorclass.h"

#include 

QOperatorClass::QOperatorClass()

{

    m_op1 = 1;

    m_op2 = 2;

}

QOperatorClass QOperatorClass::operator+(const QOperatorClass &rc) const

{

    QOperatorClass temp;

    temp.m_op1=m_op1+rc.m_op1;

    temp.m_op2=m_op2+rc.m_op2;

    return temp;

}

QOperatorClass QOperatorClass::operator*(int m)

{

    QOperatorClass temp;

    temp.m_op1=m_op1*m;

    temp.m_op2=m_op2*m;

    return temp;

}

void QOperatorClass::help()

{

    qDebug()<<"op1="< 
}
 
 
 
3. 应用
 
//main.cpp
 
#include 
 
#include "qoperatorclass.h"
 
#include 
 
 
int main(int argc, char *argv[])
 
{
 
    QCoreApplication a(argc, argv);
 
 
    qDebug()<<"add overload class operator+()";
 
     QOperatorClass classA;
 
     QOperatorClass classB;
 
     QOperatorClass classC;
 
     classC.help();
 
     classC=classA+classB;
 
     classC.help();
 
 
     qDebug()<<"\noverload class operator*()";
 
     QOperatorClass classE;
 
     QOperatorClass classF;
 
     classF.help();
 
     classF=classE*10;
 
     classF.help();
 
 
    return a.exec();
 
}
 
 
4. 结果
 
add overload class operator+()
 op1= 1  op2= 2
 op1= 2  op2= 4
 
overload class operator*()
 op1= 1  op2= 2
 op1= 10         op2= 20