Re: How to allocate a static class attribute in c++?

"Victor Bazarov" <>
Thu, 23 Aug 2007 11:43:28 -0400
herman wrote:

I have a static class attribute in my class:

class A
     static B aB;


And it's not really "an attribute", it's *a data member*.

How can I allocate this static class attribute?

I think I need to do this

A::aB = ??? ;

Close. You need to do

    B A::aB;

if your 'B' class has a default constructor, or

    B A::aB( ??? );

(replace ??? with proper constructor arguments) if your 'B' class
requires arguments for its construction.

If I do this:

A::aB = new B(); // where/when will aB be deleted if I allocate it on
the heap?

Don't. You need to un-learn your Java habits of using 'new' for

If I dont do anything, I have this linker error:

A.cpp:229: undefined reference to `A::aB'

Correct. You do need to define any static member (except if it has
a constant integral type and the address of it is never taken).

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