I want to know how I would implement the + operator overload. I already have the += operator overload figured from my previous question

Question

For my custom string class for a class assignment I have the += operator figured out from a previous question but I want to know how to implement the + operator. would I follow similar procedures?

I have already finished the += operator but I want to know how to do the + operator. I have attached the += operator and the signature for the + operator.

DSString operator+(const DSString& src)
{


}

DSString& DSString::operator+=(const DSString& src){
    if(src.data != nullptr) {
        char *tmp = new char[length + src.length + 1];
        strcpy(tmp, data);
        strcat(tmp, src.data);
        length = length + src.length;
        delete [] data;
        data = tmp;
    }
     return *this;


}

I am expecting the string to be able to concatenate together but I have no idea if I can reuse code that I already have or need to start something new.

Ive tried using src.data and then adding it to data(from whatever I have already) but that is saying data cannot be accessed. — user12006938, Sep 01 '19 at 20:42

score 2 · Answer 1 · answered Sep 01 '19 at 20:42

2

You can define that operator using the += that you just defined;

{
  DSString tmp = *this;
  return tmp += src;
}

Probably not the most efficient, though...

answered Sep 01 '19 at 20:42

Roddy

66,617
42
165
277

score -1 · Answer 2 · answered Sep 01 '19 at 20:40

-1

I'm no expert but I did it the other way around every time.

Defining the '+' operator that returns a new Object. Defining the '+=' operator that uses the '+' and returns the new Object in 'this'.

answered Sep 01 '19 at 20:40

Lovász Botond

64
3

I want to know how I would implement the + operator overload. I already have the += operator overload figured from my previous question

2 Answers2