CODEWITHSUNDEEP
c++overloading
Shane Hsu
Shane Hsu

Reputation: 8357

Implement POD to Custom Class type casting

Implementing conversion from custom class to POD or other types are quite simple. It's implemented in the custom class itself as a operator named after the destination type. Like this,

operator int{ return anInt; }

How about the other way around? Can I overload for example, int to custom class type cast?

Upvotes: 0

Views: 215

Answers (2)

Jerry Coffin
Jerry Coffin

Reputation: 490408

You can, but you do it differently, by providing a constructor for your class that takes the basic type as a parameter:

class X { 
public:
   X(int) {}
};

void f(X const &x) { }

int main(){ 
    f(2); // allowed -- will construct an X, then pass it to `f`.
}

Note that this can lead to unexpected conversions in some cases -- it's often considered better to mark such constructors as explicit to prevent them from being used except when you explicitly force the conversion.

Upvotes: 2

Benjamin Lindley
Benjamin Lindley

Reputation: 103733

Use a single argument constructor

MyClass(int n) :anInt(n) {}

Upvotes: 1

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