Added wxDECLARE_ANY_TYPE(CLS, DECL) and documented for what kind of situation it is intended: wxAny used across DLL and EXE boundaries.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62230 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/any.h

@@ -479,6 +479,53 @@ WX_ANY_DEFINE_SUB_TYPE(float, Double)
 WX_ANY_DEFINE_SUB_TYPE(double, Double)
 
 
+//
+// Defines a dummy wxAnyValueTypeImpl<> with given export
+// declaration. This is needed if a class is used with
+// wxAny in both user shared library and application.
+//
+#define wxDECLARE_ANY_TYPE(CLS, DECL) \
+template<> \
+class DECL wxAnyValueTypeImpl<CLS> : \
+    public wxAnyValueTypeImplBase<CLS> \
+{ \
+    WX_DECLARE_ANY_VALUE_TYPE(wxAnyValueTypeImpl<CLS>) \
+public: \
+    wxAnyValueTypeImpl() : \
+        wxAnyValueTypeImplBase<CLS>() { } \
+    virtual ~wxAnyValueTypeImpl() { } \
+ \
+    virtual bool ConvertValue(const wxAnyValueBuffer& src, \
+                              wxAnyValueType* dstType, \
+                              wxAnyValueBuffer& dst) const \
+    { \
+        wxUnusedVar(src); \
+        wxUnusedVar(dstType); \
+        wxUnusedVar(dst); \
+        return false; \
+    } \
+};
+
+
+// Make sure some of wx's own types get the right wxAnyValueType export
+// (this is needed only for types that are referred to from wxBase.
+// currently we may not use any of these types from there, but let's
+// use the macro on at least one to make sure it compiles since we can't
+// really test it properly in unittests since a separate DLL would
+// be needed).
+#if wxUSE_DATETIME
+    #include "wx/datetime.h"
+    wxDECLARE_ANY_TYPE(wxDateTime, WXDLLIMPEXP_BASE)
+#endif
+
+//#include "wx/object.h"
+//wxDECLARE_ANY_TYPE(wxObject*, WXDLLIMPEXP_BASE)
+
+//#include "wx/arrstr.h"
+//wxDECLARE_ANY_TYPE(wxArrayString, WXDLLIMPEXP_BASE)
+
+
+
 #ifdef __VISUALC6__
     // Re-enable useless VC6 warnings
     #pragma warning (pop)

interface/wx/any.h

@@ -63,6 +63,25 @@
     Note that pointers to any and all classes are already automatically
     declared as movable data.
 
+    @warning Caveat with shared libraries (DLLs): If you have a scenario where
+             you use wxAny across application's shared library and application
+             itself (or, with another of your shared libraries), then you must
+             use wxDECLARE_ANY_TYPE() macro in your shared library code to
+             correctly make sure that the wxAnyValueType implementation is
+             generated correctly. Failure to do this will result in breakage
+             of the wxAny type recognition with type in question. Below is an
+             example how to use the macro.
+             @code
+                // In your shared library/DLL-only
+                wxDECLARE_ANY_TYPE(MyClass, WXEXPORT)
+
+                // In your shared library/DLL source code
+                WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<MyClass>)
+
+                // In code using said shared library/DLL
+                wxDECLARE_ANY_TYPE(MyClass, WXIMPORT)
+             @endcode
+
     @library{wxbase}
     @category{data}
 

src/common/any.cpp

@@ -339,6 +339,10 @@ WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImplString)
 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<bool>)
 WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImplDouble)
 
+WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<wxDateTime>)
+//WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<wxObject*>)
+//WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<wxArrayString>)
+
 //-------------------------------------------------------------------------
 // wxAnyNullValueType implementation
 //-------------------------------------------------------------------------