Chapter 6 Quick Reference


To

Do this

Define a class.

Add a header file to your project. Define the class in the header file. For example:

class MyClass { public: void MyFunction(); private: int myData; };

Implement a class.

Add a source file to your project. In the source file, use a #include statement to include the header file that contains the class definition. Then implement the member functions in the source file. For example:

#include "MyHeader.h" void MyClass::MyFunction() { myData = myData * 2; }

Provide a constructor in a class.

Declare the constructor in the header file, and implement it in the source file. The constructor must have the same name as the class and cannot return a value. However, a constructor can take parameters. For example:

// Header file class MyClass { public: MyClass(int n); ... }; // Source file MyClass::MyClass(int n) { myData = n; }

Provide a destructor in a class.

Declare the destructor in the header file, and implement it in the source file. The destructor must have the same name as the class, preceded by a tilde (~). The destructor cannot return a value or take any parameters. For example:

// Header file class MyClass { public: ~MyClass(); ... }; // Source file MyClass::~MyClass() { Console::WriteLine(S"Goodbye"); }

Create and destroy objects of an unmanaged class.

Create an object using the new keyword, passing parameters into the constructor if necessary. Delete the object using the delete keyword. For example:

MyClass * ptrToObject; ptrToObject = new myClass(100); ptrToObject->MyFunction(); delete ptrToObject;

Define class-wide data members.

Declare the data member using the static keyword. Define the data member in the source file. For example:

// Header file class MyClass { private: static int myClassData; ... }; // Source file int MyClass:myClassData = 0;

Define and use class-wide member functions.

Declare the member function using the static keyword. Implement the member function in the source file. Call the function using the syntax ClassName::FunctionName. For example:

// Header file class MyClass { public: static void MyClassFunction(); ... }; // Source file void MyClass::MyClassFunction() { myClassData++; } // Client code MyClass::MyClassFunction();

Define relationships between objects.

Define all the required classes, and use pointers to denote relationships between objects. For example, if an instance of class A needs to point to an instance of class B, use the following:

class B { ... }; class A { ... private: B * pointerToB; };




Microsoft Visual C++  .NET(c) Step by Step
Microsoft Visual C++ .NET(c) Step by Step
ISBN: 735615675
EAN: N/A
Year: 2003
Pages: 208

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