Customizing the Copying of Instances - C++ Class

C++ examples for Class:Constructor

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Description

Customizing the Copying of Instances

Demo Code

                                                                               
#include <iostream>
                                                                               
using namespace std;
                                                                               
class MyClass//ww  w. j  a v  a2  s .c  om
{
protected:
    static int NextAvailableID;
    int UniqueID;
public:
    int SomeNumber;
    int GetID() { return UniqueID; }
    MyClass();
    MyClass(int x);
    MyClass(const MyClass& source);
};
                                                                               
MyClass::MyClass()
{
    UniqueID = NextAvailableID;
    NextAvailableID++;
}
                                                                               
MyClass::MyClass(int x)
{
    UniqueID = NextAvailableID;
    NextAvailableID++;
    SomeNumber = x;
}
                                                                               
MyClass::MyClass(const MyClass& source)
{
    UniqueID = NextAvailableID;
    NextAvailableID++;
    SomeNumber = source.SomeNumber;
}
                                                                               
int MyClass::NextAvailableID;
                                                                               
int main()
{
    MyClass take1 = 100;
    MyClass take2;
    take2.SomeNumber = 200;
    MyClass take3 = take1;
                                                                               
    cout << take1.GetID() << " "
         << take1.SomeNumber << endl;
    cout << take2.GetID() << " "
         << take2.SomeNumber << endl;
    cout << take3.GetID() << " "
         << take3.SomeNumber << endl;
    return 0;
}

Result


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