const function in C++

const keyword after function header..

1. Initializers
2. extern (C++):: microsoft

take a look:)

3. 8.10 — Const class objects and member functions
4. Const member functions in C++

Like member functions and member function arguments, the objects of a class can also be declared as const. an object declared as const cannot be modified and hence, can invoke only const member functions as these functions ensure not to modify the object.

A const object can be created by prefixing the const keyword to the object declaration. Any attempt to change the data member of const objects results in a compile-time error.

Syntax: const Class_Name Object_name;

• When a function is declared as const, it can be called on any type of object, const object as well as non-const objects.
• Whenever an object is declared as const, it needs to be initialized at the time of declaration. however, the object initialization while declaring is possible only with the help of constructors.

A function becomes const when the const keyword is used in the function’s declaration. The idea of const functions is not to allow them to modify the object on which they are called. It is recommended the practice to make as many functions const as possible so that accidental changes to objects are avoided.

5. const (C++)

const member functions Declaring a member function with the const keyword specifies that the function is a "read-only" function that does not modify the object for which it is called. A constant member function cannot modify any non-static data members or call any member functions that aren't constant.To declare a constant member function, place the const keyword after the closing parenthesis of the argument list.

The const keyword is required in both the declaration and the definition.

6. Const member functions in C++ :: already tested

The const member functions are the functions which are declared as constant in the program. The object called by these functions cannot be modified. It is recommended to use const keyword so that accidental changes to object are avoided.

A const member function can be called by any type of object. Non-const functions can be called by non-const objects only.

7. Meaning of 'const' last in a function declaration of a class?
8. What is meant with “const” at end of function declaration? [duplicate]
9. const (computer programming)
10. The C++ 'const' Declaration: Why & How
11. 8.9 — Class code and header files
12. 8.8 — The hidden “this” pointer
13. 8.7 — Destructors
14. 8.6 — Overlapping and delegating constructors
15. Const Correctness
16. C++ keywords: const