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abstract classes

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Learn_CPP_Programming_Deep_Dive/Section 15 Polymorphism/Abstract_functions
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	`1`	`+#include <iostream>`
	`2`	`+`
	`3`	`+using namespace std;`
	`4`	`+`
	`5`	`+class Base`
	`6`	`+{`
	`7`	`+ public:`
	`8`	`+ void fun1()`
	`9`	`+ {`
	`10`	`+ cout<<"fun1() in Base"<<endl;`
	`11`	`+ }`
	`12`	`+`
	`13`	`+ virtual void fun2() = 0; // this is a pure virtual function -> it forces the derived classes to implement them, otherwise they remain abstract classes too`
	`14`	`+};`
	`15`	`+`
	`16`	`+`
	`17`	`+class Child : public Base`
	`18`	`+{`
	`19`	`+ public:`
	`20`	`+ void fun2()`
	`21`	`+ {`
	`22`	`+ cout<<"fun2() in Derived"<<endl;`
	`23`	`+ }`
	`24`	`+};`
	`25`	`+`
	`26`	`+`
	`27`	`+int main(void)`
	`28`	`+{`
	`29`	`+ Base *b = new Child();`
	`30`	`+ b->fun1();`
	`31`	`+ b->fun2();`
	`32`	`+`
	`33`	`+ // Base bb; // it is not possible to instantiate an abstract class`
	`34`	`+`
	`35`	`+ /* The purpose of inheritance is either reusability of functions or polymorphism at runtime */`
	`36`	`+`
	`37`	`+`
	`38`	`+`
	`39`	`+ return 0;`
	`40`	`+}`

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