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Compiler-specific Features
When a class is marked __declspec(dllexport), for example,
class __declspec(dllexport) S { ... }; its static data members and member functions
are all exported. When individual static data members and member functions are
marked with __declspec(dllexport), only those members are exported. vtables,
construction vtable tables and RTTI are also exported.
Note
The following declaration is correct:
class __declspec(dllexport) S { ... };
The following declaration is incorrect:
__declspec(dllexport) class S { ... };
In conjunction with --export_all_vtbl, you can use __declspec(notshared) to exempt a
class or structure from having its vtable, construction vtable table and RTTI exported.
--export_all_vtbl and __declspec(dllexport) are typically not used together.
Restrictions
If you mark a class with __declspec(dllexport), you cannot then mark individual
members of that class with __declspec(dllexport).
If you mark a class with __declspec(dllexport), ensure that all of the base classes of
that class are marked __declspec(dllexport).
If you export a virtual function within a class, ensure that you either export all of the
virtual functions in that class, or that you define them inline so that they are visible to
the client.
Example
The __declspec() required in a declaration depends on whether or not the definition is
in the same shared library.
/* This is the declaration for use in the same shared library as the */
/* definition */
__declspec(dllexport) extern int mymod_get_version(void);
/* Translation unit containing the definition */
__declspec(dllexport) extern int mymod_get_version(void)
{
return 42;
}
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