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Object Slicing in C++
Object slicing is used to describe the situation when you assign an object of a derived class to an instance of a base class. This causes a loss of methods and member variables for the derived class object. This is termed as information being sliced away. For example,
class Foo {
int a;
};
class Bar : public Foo {
int b;
}Since Bar extends Foo, it now has 2 member variables, a and b. So if you create a variable bar of type Bar and then create a variable of type Foo and assign bar, you'll lose the member variable b in the process. For example,
Bar bar; Foo foo = bar;
In this case, the information in for about b is lost in a bar. This is known as member slicing.
Updated on: 30-Jul-2019
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