What's the difference between these two ways of creating a C++ class?

Question

I don't know how to name these things properly. I want to create a class, declare and define it's constructor with a variable and default value. I figured out that both these ways work. But what's the difference? Is one of them correct or both are good?

class Box
{
   public:
   int size;
      Box() {size = 6;};
};


class Box
{
   public:
   int size;
      Box(): size(6) {};
};

Is there a reason why (like performance or something)? Or it's just convention? — 100MB, Nov 25 '15 at 15:09
Mostly performance, also there are contexts that the initializers list is mandatory (e.g., initialization of references, const variables e.t.c) — 101010, Nov 25 '15 at 15:10

score 1 · Answer 1 · answered Nov 25 '15 at 15:10

1

There is little difference, for int, but for complex classes, the initializer list is better.

Consider const int, int &, which show the syntactic benefit

answered Nov 25 '15 at 15:10

mksteve

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What's the difference between these two ways of creating a C++ class?

1 Answers1