When wxUSE_STL == 1 and STL provides quasi-standard hash_map/hash_set,
wxHashMap/wxHashSet are just typedefs for them. This makes impossible to forward declare these classes. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@27182 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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