CODEWITHSUNDEEP
c++
Stephen
Stephen

Reputation: 25

Dynamically allocated data members in class constructor

I am having issues with trying to figure out how I would turn a data member inside a class (which was originally an int) into a pointer to a dynamically allocated piece of memory.

I know I can do int *num = new int under normal circumstances, but how would I initialize it in a class?

My teacher did an amazing job of not explaining this in the crappiest way possible in class -_-.

This is an example of the class and the constructor.

The header

class Double
{
private:
double *val;

The .cpp

Double::Double()
{
this->equals(0.0);
}

Double::Double(const Double &d)
{
this->equals(d.val);
}

Double::Double(const double &d)
{
this->equals(d);
}

Double::Double(const Interger &i)
{
this->equals(i.toInt());
}

//New overloaded constructor using strings
Double::Double(const string &s)
{
this->equals(s);
}

void Double::equals(const double &d)
{
this->val = d;
}

All I know is I have to make the data member a pointer now, but I have no idea how to create the new memory. I tried looking this up but I could not find an example of how to do DAM inside an actual class for its memory and constructor.

EDIT Solution was a simpler then I thought.

Double::Double() : val(new double) { ...... }

just have to do that to every constructor, then change any instance of d.val or this->val to *d.val or *this->val.

Upvotes: 0

Views: 1329

Answers (1)

Stephen
Stephen

Reputation: 25

SOLUTION TO MY PROBLEM (So the problem is solved)

Solution was simpler then I thought. 

Double::Double() : val(new double)
{
......
}

just have to do that to every constructor, then change any instance of d.val or this->val to *d.val or *this->val.

Deconstructors will have to be created to clear the memory though.

Upvotes: 1

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