Syntax

• const Type myVariable = initial; // Declares a const variable; cannot be changed
• const Type &myReference = myVariable; // Declares a reference to a const variable
• const Type *myPointer = &myVariable; // Declares a pointer-to-const. The pointer can change, but the underlying data member cannot be changed through the pointer
• Type * const myPointer = &myVariable; // Declares a const pointer. The pointer cannot be reassigned to point to something else, but the underlying data member can be changed
• const Type * const myPointer = &myVariable; // Declares a const pointer-to-const.

A variable marked as const cannot be changed. Attempting to call any non-const operations on it will result in a compiler error.

Const local variables

Const pointers

Const member functions

Avoiding duplication of code in const and non-const getter methods