passobjectsbyref.cpp

来自「《24学时精通c++》的光盘内容」· C++ 代码 · 共 114 行

 //Listing 12.1

 // Passing pointers to objects

 #include <iostream.H>

 

 class SimpleCat

 {

 public:

     SimpleCat ();                    // constructor

     SimpleCat(SimpleCat&);     // copy constructor

     ~SimpleCat();                    // destructor

 };

 

 SimpleCat::SimpleCat()

 {

     cout << "Simple Cat Constructor...\n";

 }

 

 SimpleCat::SimpleCat(SimpleCat&)

 {

     cout << "Simple Cat Copy Constructor...\n";

 }

 

 SimpleCat::~SimpleCat()

 {

     cout << "Simple Cat Destructor...\n";

 }

 

 SimpleCat FunctionOne (SimpleCat theCat);

 SimpleCat* FunctionTwo (SimpleCat *theCat);

 

 int main()

 {

     //std::
		 cout << "Making a cat...\n";

     SimpleCat Frisky;

     //std::
	 cout << "Calling FunctionOne...\n";

     FunctionOne(Frisky);

     //std::
	 cout << "Calling FunctionTwo...\n";

     FunctionTwo(&Frisky);

     return 0;

 }

 

 // FunctionOne, passes by value

 SimpleCat FunctionOne(SimpleCat theCat)

 {

     //std::
	 cout << "Function One. Returning...\n";

     return theCat;

 }

 

 // functionTwo, passes by reference

 SimpleCat* FunctionTwo (SimpleCat  *theCat)

 {

     //std::
		 cout << "Function Two. Returning...\n";

     return theCat;

 }