Performance with static class members

[Lykurg]

Hi,

since I don't trust myself I just want ensure that:

class A
{
  public:
    static void save(QString& str)
    { /* huge and complex save function */ }
};

class A
{
  public:
    static void save(QString& str)
    { /* huge and complex save function */ }
};

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is regarding to performance issues equal:

class A {};
class AHelper
{
  static void saveHelper(const A& a, QString&str); // which "equals" a.save();
};

class A {};
class AHelper
{
  static void saveHelper(const A& a, QString&str); // which "equals" a.save();
};

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assuming you have thousands of A's. (The point is, I want to hold A as small as possible.)

[wysota]

That's correct, as far as I know. Static methods are really not parts of the class but rather they are exported to the global space. I think in this situation it only matters if the method is virtual or not (it's still a class method so there is no penalty for having multiple instances of the class).

[Lykurg]

Ok, thanks, then I am going to restructure some code of mine, because I hate helper classes.