Provide dummy operators to fix linker errors with msvc

[Christian Ehrlicher]

Hi,

Because msvc needs a fully instantiated class when this class is
exported (see '[Patch] fix compile kdecore with msvc'), we need a dummy
comparator== and a dummy function qHash(class). Qt is doing the same
thing for operator== in qglobal.h.

---------------------------8<--------------
#ifdef K_FULL_TEMPLATE_EXPORT_INSTANTIATION
# define K_DUMMY_COMPARISON_OPERATOR(C) \
    bool operator==(const C&) const { \
        qWarning(#C"::operator==(const "#C"&) was called"); \
        return false; \
    }
# define K_DUMMY_QHASH_OPERATOR(C) \
    inline uint qHash(const C) { \
        qWarning("inline uint qHash(const "#C") was called"); \
        return 0; \
    }
#else
# define K_DUMMY_COMPARISON_OPERATOR(C)
# define K_DUMMY_QHASH_OPERATOR(C)
#endif
---------------------------8<--------------

If you want, you can additional mask this with

#ifdef MAKE_KFOO_LIB
K_FULL_TEMPLATE_EXPORT_INSTANTIATION(KFooClass)
K_DUMMY_QHASH_OPERATOR(KFooClass)
#endif

So nobody using this lib can access those functions and gcc won't care
because K_FULL_TEMPLATE_EXPORT_INSTANTIATION isn't set...


Christian


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