From: James Yu on
I follow the example provided at
http://docs.wxwidgets.org/2.8.6/wx_wxhashset.html as follows:

class MyClass { /* ... */ };
// same, with MyClass* keys (only uses pointer equality!)
WX_DECLARE_HASH_SET( MyClass*, wxPointerHash, wxPointerEqual, MySet1 );
....

here is my line:
WX_DECLARE_HASH_SET(DIRPICKERDESC*, wxPointerHash, wxPointerEqual,
DIRPICKERDESCSET);
DIRPICKERSEC is a class, and DIRPICKERSESCSET is the class for the set.

When I built my project, I got the following error:
error: `DIRPICKERDESCSET' has not been declared

Could someone offer me some hints ?
Thanks,
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James C.-C.Yu