CODEWITHSUNDEEP
c++templates
Michael D
Michael D

Reputation: 1479

C++ use template in gettor function

Suppose there are two types of object A and B and two getter functions 

objA* getA(int id) and objB* getB(int id)

Object A and B are mutually exclusive. i.e. if a object is A, then it is not B. When to find a object using an ID, the code I use is below. So I am just wondering if the function can return non-NULL object pointer which may point to A or B using template. Or return null if the id is invalid.

void find(int id)
{
    objA* pa = getA(id);
    if (pa != NULL)
    {
      return;
    }

    objB* pb = getB(id);
    if (pb != NULL)
    {
      return;
    }
}

Upvotes: 4

Views: 93

Answers (1)

Michael Kristofik
Michael Kristofik

Reputation: 35188

I think Boost Variant has what you need. It's an abstraction for a single object that might be one of several types. Your function signature then becomes:

boost::variant<A*, B*> find(int id);

Upvotes: 3

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