Just thought of having a simple example which has everything you need to know about the basics of C++. It has Inheritance, polymorphism, operator overloading, templates using friend as well as non-friend functions.
Code: Cpp
#include <iostream>
using namespace std;
template <typename T>
class Base
{
protected:
T strQuery;
public:
Base(T q = NULL): strQuery(q){}
Base(Base<T> &b): strQuery(b.strQuery){}
~Base(){}
T getQuery(void){return strQuery;}
void setQuery(T q){strQuery = q;}
};
template <typename T>
class Derived : public Base<T>
{
public:
//Default Functions also provided
Derived(const T q = NULL): Base<T>(q){}
Derived(const Derived &d): Base<T>(d.strQuery){}
~Derived(){}
Derived<T> operator=(const Derived<T> d)
{
if(this != &d)
this->strQuery=d.strQuery;
return *this;
}
//Input Output Functions
friend ostream& operator <<(ostream&,const Derived<T>&);
friend istream& operator >>(istream&,Derived<T>&);
//op + Functionality
Derived<T> operator + (const Derived<T>) const;
Derived<T> operator + (const T) const;
friend Derived<T> operator + (const T,const Derived<T>);
Derived<T>& operator ++ ();
Derived<T>& operator ++ (int);
Derived<T>& operator += (const Derived<T>);
};
template<typename T>
ostream& operator <<(ostream& out,const Derived<T>& d)
{
out<<d.strQuery;
return out;
}
template<typename T>
istream& operator >>(istream& in,Derived<T>& d)
{
in>>d.strQuery;
return in;
}
template<typename T>
Derived<T> Derived<T>::operator + (const Derived<T> d) const
{
Derived<T> temp;
temp.strQuery = this->strQuery + d.strQuery;
return temp;
}
template<typename T>
Derived<T> Derived<T>::operator + (const T t) const
{
Derived<T> temp;
temp.strQuery = this->strQuery + t;
return temp;
}
template<typename T>
Derived<T> operator + (const T t,const Derived<T> d)
{
Derived<T> temp;
temp.strQuery = d.strQuery + t;
return temp;
}
template<typename T>
Derived<T>& Derived<T>::operator ++ ()
{
++(this->strQuery);
return *this;
}
template<typename T>
Derived<T>& Derived<T>::operator ++ (int)
{
this->strQuery++;
return *this;
}
template<typename T>
Derived<T>& Derived<T>::operator += (const Derived<T> d)
{
this->strQuery += d.strQuery;
return *this;
}
int main(int argc,char *argv[])
{
Derived<double> d1,d2(10);
Derived<double> d3(d1);
cout<<"Enter Number\n";
cin>>d1;
cout<<d1;
cout<<endl;
d2=d1;
d3 = d1 + 1;
d3 = d2++;
d3=++d2;
d3 = d2 = d1 = 1.2L;
d3 += d2;
cout<<d3<<"\t"<<d2<<"\t"<<d1<<"\n";
return 0;
}
