c++ 通过引用传递对象

[c++]代码库

#include <iostream>

using namespace std;
class SimpleCat {
public:
	SimpleCat(); // constructor
	SimpleCat(SimpleCat&); // copy constructor
	~SimpleCat(); // destructor
};

SimpleCat::SimpleCat() {
	cout << "Simple Cat Constructor..." << endl;
}

SimpleCat::SimpleCat(SimpleCat&) {
	cout << "Simple Cat Copy Constructor..." << endl;
}

SimpleCat::~SimpleCat() {
	cout << "Simple Cat Destructor..." << endl;
}

SimpleCat FunctionOne(SimpleCat theCat);
SimpleCat* FunctionTwo(SimpleCat *theCat);

int main() {
	cout << "Making a cat..." << endl;
	SimpleCat Frisky;
	cout << "Calling FunctionOne..." << endl;
	FunctionOne(Frisky);
	cout << "Calling FunctionTwo..." << endl;
	FunctionTwo(&Frisky);
	return 0;
}

// FunctionOne, passes by value
SimpleCat FunctionOne(SimpleCat theCat) {
	cout << "Function One. Returning... " << endl;
	return theCat;
}

// functionTwo, passes by reference
SimpleCat* FunctionTwo(SimpleCat *theCat) {
	cout << "Function Two. Returning... " << endl;
	return theCat;
}