Copy Constructor ????

Hi...
wat is Copy Constructor ??? when it is invoked ???



Regards,
Sundar.G

Basically it is to create a deep copy of an object.

A copy constructor takes the class name.

Its called when you create an object from another. Or when you assign an object to another.

Code:

---

// Assume these are implemented elsewhere, for simplicity sake
class Foo
{
public:
    Foo(); // Regular
    Foo(Foo &f); // Copy

    ...
};

Foo f1, f2;

Foo f3(f1); // Copy Constructor

f1.DoSomething();
f2 = f1; // Copy Constructor

---

Most compilers will provide one if you do not create it yourself, a very basic one though.

Mind reading books? What are good books about C++ ?

Actually the assignment operator is called when making assignments to existing objects. It is a common cause of confusion. :)

Quote:

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Originally Posted by TheCPUWizard

Actually the assignment operator is called when making assignments to existing objects. It is a common cause of confusion. :)

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To confuse even more (and hopefully clarify by doing so):

Code:

---

A a0;
A a1(a0);  // copy constructor
A a2 = a1;  // copy constructor
a2 = a1;    // assignment operator

---

Jeff

Hence the reason for me using the word "existing" in my post :D :D

Quote:

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Originally Posted by TheCPUWizard

Hence the reason for me using the word "existing" in my post :D :D

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And also the reason I used the word "clarify" in my post :D

Jeff