Constructing and destructing dynamic objects point *pp0=new point; point *pp1=new point(1.0); point *pp2=new point(10.0, 20.0); point *arrPoints=new point[10]; // array of 10 points // initialized with the default constructor // in order of increasing addresses // new T[] - calls only the default c...
Defining class point { double x, y; public: // … point(double, double); point(double); point() { x = y = 0.0; }; }; inline point::point(double d) { x = y = d; } point::point(double x0, double y0) { x = x0; y = y0; } ...
Destructor Called when the object is destroyed Necessary if something should be done at this timepoint Destructor for the class T: ~T(); Example ~point() // no args, no returned value ...
Default function arguments int fun(int i1, int i2=20, int i3=30); starting from the first default argument, all remaining also have to be default function with default arguments is not overloaded, &fun(int) == &fun(int, int) we may overload: int fun(int i1, int i2); // declaration is ...
Goto more restrictions than in C: - cannot jump over initialization (in C initializations are always before goto-s…) - … this function is wrong: void fn(void) { goto end; int i = 1; end: ; } ...
Hermetization and encapsulation encapsulation - defining all data and methods in single class hermetization - restricting access to class members All class members are private by default OOOP — orthodox OOP: - all class data members are private - we access them from outside through class method...
Inheritance Reveals hierarchic relations between classes To develop (extend) existing classes without need to modify or recompile them Reusability of code (one defines only what is added or changed, all the rest is reused) Base class p...
Inline functions inline int sum(int a, int b) { return a+b; } places the code in place where it is called many copies in case of many calls destined to replace macro definitions inline keyword is only a recommendation for the compiler au...
Many objects Usually many objects are similar - with the same set of features We define the set only once and use it many times class — a group of items, things etc., possessing some features in common We need one class for all similar objects ...
Member access operator - T* operator-(); T t; t-m is interpreted as: ( t.operator- )-m we may use object as if it were a pointer if operator- returns no pointer, then - we still may use it: a=t.operator-(); - we cannot do: a=t-; it's a syn...
