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云代码 - c++代码库

c++ 传递引用给对象

2012-11-25 作者: 程序猿style举报

[c++]代码库

#include <iostream>
using namespace std;
 
class SimpleCat {
public:
    SimpleCat();
    SimpleCat(SimpleCat&);
    ~SimpleCat();
 
    int GetAge() const {
        return itsAge;
    }
    void SetAge(int age) {
        itsAge = age;
    }
 
private:
    int itsAge;
};
 
SimpleCat::SimpleCat() {
    cout << "Simple Cat Constructor..." << endl;
    itsAge = 1;
}
 
SimpleCat::SimpleCat(SimpleCat&) {
    cout << "Simple Cat Copy Constructor..." << endl;
}
 
SimpleCat::~SimpleCat() {
    cout << "Simple Cat Destructor..." << endl;
}
 
const SimpleCat & FunctionTwo(const SimpleCat & theCat);
 
int main() {
    cout << "Making a cat..." << endl;
    SimpleCat Frisky;
    cout << "Frisky is " << Frisky.GetAge() << " years old" << endl;
    int age = 5;
    Frisky.SetAge(age);
    cout << "Frisky is " << Frisky.GetAge() << " years old" << endl;
    cout << "Calling FunctionTwo..." << endl;
    FunctionTwo(Frisky);
    cout << "Frisky is " << Frisky.GetAge() << " years old" << endl;
 
    return 0;
}
 
// functionTwo, passes a ref to a const object
const SimpleCat & FunctionTwo(const SimpleCat & theCat) {
    cout << "Function Two. Returning..." << endl;
    cout << "Frisky is now " << theCat.GetAge();
    cout << " years old " << endl;
    // theCat.SetAge(8); const!
    return theCat;
}


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