C + + Knowledge Point collation-Continuous update

virtual is a key word for C + +, and virtual-modified functions can be overridden by a quilt class.

Usage: Add a keyword before the return value type.

override is a reserved word for C + + (note is not a keyword), indicating that the current function overrides the virtual function of the base class.

Objective: 1, in the case of more functions, you can remind the reader that a function overrides the virtual function of the base class (indicating that the function is inherited from the base class, not the derived class is customized)

2, forcing the compiler to check whether a function overrides the virtual function of the base class, if there is no error.

Usage: Add a reserved word after the member function parameter list of the class.

Virtual and override are used to correspond, so the code is easier to read.

function pointers and Function objects:

　　

C + + Knowledge Point collation-Continuous update