C++ – Difference between private, public, and protected inheritance


What is the difference between public, private, and protected inheritance in C++?

All of the questions I've found on SO deal with specific cases.

Best Answer

class A 
       int x;
       int y;
       int z;

class B : public A
    // x is public
    // y is protected
    // z is not accessible from B

class C : protected A
    // x is protected
    // y is protected
    // z is not accessible from C

class D : private A    // 'private' is default for classes
    // x is private
    // y is private
    // z is not accessible from D

IMPORTANT NOTE: Classes B, C and D all contain the variables x, y and z. It is just question of access.

About usage of protected and private inheritance you could read here.