libreoffice/xmloff/source/forms/ifacecompare.hxx

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#ifndef _XMLOFF_FORMS_IFACECOMPARE_HXX_
#define _XMLOFF_FORMS_IFACECOMPARE_HXX_

#include <comphelper/stl_types.hxx>
#include <com/sun/star/beans/XPropertySet.hpp>
#include <com/sun/star/drawing/XDrawPage.hpp>

//.........................................................................
namespace xmloff
{
//.........................................................................

    //=====================================================================
    //= OInterfaceCompare
    //=====================================================================
    /** is stl-compliant structure for comparing Reference&lt; &lt;iface&gt; &gt; instances
    */
    template < class IAFCE >
    struct OInterfaceCompare
        :public ::std::binary_function  <   ::com::sun::star::uno::Reference< IAFCE >
                                        ,   ::com::sun::star::uno::Reference< IAFCE >
                                        ,   bool
                                        >
    {
        bool operator() (const ::com::sun::star::uno::Reference< IAFCE >& lhs, const ::com::sun::star::uno::Reference< IAFCE >& rhs) const
        {
            return lhs.get() < rhs.get();
                // this does not make any sense if you see the semantics of the pointer returned by get:
                // It's a pointer to a point in memory where an interface implementation lies.
                // But for our purpose (provide a reliable less-operator which can be used with the STL), this is
                // sufficient ....
        }
    };

    typedef OInterfaceCompare< ::com::sun::star::beans::XPropertySet >  OPropertySetCompare;
    typedef OInterfaceCompare< ::com::sun::star::drawing::XDrawPage >   ODrawPageCompare;

//.........................................................................
}   // namespace xmloff
//.........................................................................

#endif // _XMLOFF_FORMS_IFACECOMPARE_HXX_