C++ Class Concept - Constructor

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Hi All,

go through below code.

C#

class Test
{
public:
    Test()
    {
        cout<<"Constr"<<endl;
    }

    ~Test()
    {
        cout<<"Destructor"<<endl;
    }
};

int main(int argc, char* argv[])
{

    Test *test = new Test();
    Test *n = new Test;


    delete n;
    return 0;
}

For Underlined code will make any difference?

Regards,
Ranjith

Posted 25-Jun-14 20:20pm

ranjithkumar81

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OriginalGriff · Answer 1 · 2014-06-25T20:24:00

Well, if you ignore that you only delete one of the new instances, no.

All you do is declare two variables, and create two separate instances of your class to assign to them. The name of the variable is irrelevant - the class can't even tell if it is going to be held in a variable, much less what it is called!

Albert Holguin · Answer 2 · 2014-06-26T11:01:00

C#

Test *test = new Test(); //Initialize object "test" of type "Test" with empty argument list
Test *n = new Test; //Initialize object "n" of type "Test" using default constructor

...since you only have one constructor, these two statements are equivalent... If you had more than one type of constructor (i.e. those where you can pass arguments upon initialization), you would need to use the new Test(initializers) syntax, since new Test will always simply give you the default.

C++ Class Concept - Constructor

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