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What is slicing problem in C++/cpp?

What is slicing problem in C++?

Slicing is where you assign an object of a derived class to an instance of a base class, thereby losing part of the information - some of it is “sliced” away.

For example,

class A {
int foo;
};

class B : public A
{
int bar;
};

So an object of type B has two data members, foo and bar

Then if you were to write this:

B b;

A a = b;

Then the information in b about member bar is lost in a.

http://en.wikipedia.org/wiki/Object_slicing