Conversion derived - base The conversion from ”pointer to derived” to ” pointer to base” is allowed and automatic without explicit cast operator … if inheritance was public - Why only one-wa...
Conversion operator a.k.a. conversion function / method, it converts object of its own class to other class T::operator X(); Conversion operator of class T to the X type: - no return value specified, - no argument(s) specified, - declared as a class method example: person::operator int(); ...
Copy constructor in derived class It is a constructor so: - Remember the order of constructors: base class(es) constructor(s) will always run - One may supply parameters for base class constructor at initiation list - Remember: also member objects will be constructed class derived:public base { ....
Copy constructor Used for initializing objects using other objects of the same class, for the T class: T::T(const T &); Parameter has to be a reference; otherwise temp. object would be created, that should also be somehow initialized - with the copy constructor! Parameter should be const ...
Declarations are statements in C++ declaration inside block is a statement it may be placed after other statements { int i=12; cout ...
Default function arguments void line(int len, char c='*') { for (int i=0; i...
Defining methods Inside class declaration class person { … void input() { cinageFNameLName; } // semicolon not required … }; a method defined inside a class declaration is inline by default outside of the class: - use the scope operator - by default, such method is not inline void person :: s...
Derived class adult contains fields and methods: char * name, * surname — inherited, inaccessible for the class adult char *nr_ID_card — private in adult print_name(), print_surname () — public, inherited from person person::print_all() — public, inherited, hidden: use scope operator (::) to acce...
Friend by declaring a ”friendly” code we allow accessing protected and private members of the class class A { friend C::theMethodNoArg(); // specific method (if overloaded, then with specific args) friend class B; // concerns whole declaration of...
Initialization list in a definition of a constructor (and only there) we may use an initialization list T() : member(initializer) [, member(initializer) …] { } class point { double x, y; public: // … point():x(0.0), y(0.0) {}; }; inline point::point(double d) :x(d), y(d) { // all done } point::po...
