C++ source code demo of copy constructor, default constructor, and assignment operator

(Last Updated On: June 20, 2010)

Another example of Copy Constructor, Default Constructor, Assignment Operator with CONVERSION OPERATOR

using namespace std;

class A {
string s;
A(string str) {s=str;} //constructors must be public
A(A&){} //copy ctr and also does deep copy
A(int iname): x(iname) {}
//int i2=2; // note that you cannot initialize non-const static members in classes
int x;
double d;
operator int() {return x;} //this is a conversion operator

// below is the copy assignment operator,also passed & allows chaining like a=b=c;
// this also demonstrates deep/hard copy
A & operator = (const A & rhs) {
//delete this; this causes program crash
if (this != &rhs) {
//*this = other; // this line can program crash
//by convention always return * this
return *this;
A() {} //this default ctr is needed because of the 1 argument constructor and has to be public

int main() {
string str=”hello”;
A a1;
A b=a1; //this calls copy ctr
A b2(a1); //this calls copy ctr
A *c=new A(a1);
A* d1=new A(a1); //note A* d[10]=new A(a1); causes error

A* d2[10];
for(int i=0;i<10;++i) d2[i]=new A; int i=A(10); //this uses conversion operator (type int) A d3; d3=a1; //this uses copy assignment operator cout<<"d3.x="<FACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!

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