c++ - What is object slicing? -

someone mentioned in irc, google doesn't have answer.

"slicing" assign object of derived class instance of base class, thereby losing part of information - of "sliced" away.

for example,

class {    int foo; };  class b : public {    int bar; };

so object of type b has 2 data members, foo , bar.

then if write this:

b b;  a = b;

then information in b member bar lost in a.

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