C++ - Functions

Last Updated: 2022-02-12

non-member functions vs member functions

• non-member functions, a.k.a. free functions: do not belong to any class.
• member functions, a.k.a. methods(but "method" is not used in the C++ standard): part of a class or a struct.

Types of functions

• overloaded functions
• static functions
• inline functions
• operators
• const member functions
• virtual member functions
• special class functions: default constructor, copy constructor, copy assignment operator, destructor; (since C++11) move constructor, move assignment operator
• function templates
• pure virtual function (= 0): subclasses have to implement this function, otherwise they are abstract. E.g. virtual std::string ToString( ) = 0;
• variadic function templates (C++11)
• constexpr functions (C++11)
• consteval functions / immediate functions (C++20)
• override and final for virtual functions (C++11)
• = default and = delete functions (C++11)
• lambdas (C++11)
• coroutines (C++20)

Lambda

Use lambda expressions as anonymous functors.