CODEWITHSUNDEEP
c++constructorreferenceconstants
ellysisland
ellysisland

Reputation: 89

Building objects while passing them as const reference C++

Can I build parameter const reference inside the method call? I know it compiles, but am not completely confident it is correct at run time.

I have the following classes:

class A{
public:
void doThings(const B& b);
}

class B{
   B(int i, int j);

}


int main{

    A a;

    a.doThings(B(1,2));   //Is this OK?

}

Upvotes: 0

Views: 93

Answers (1)

rustyx
rustyx

Reputation: 85541

The concept is fine... a temporary B will be constructed and passed by reference. Don't store that reference in A or use anywhere beyond the scope of doThings.

But your code is no good. Here, I fixed it for you:

class B;

class A {
public:
  void doThings(const B& b) {}
};

class B {
public:
  B(int i, int j) {}
};


int main() {

  A a;

  a.doThings(B(1, 2));   //Is this OK?

}

Upvotes: 2

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