yang686526

rtti and entities
rtti and entities
hi there,
i'd like to use rtti when iterating through an oddbblocktablerecord to select for certain entities like circles,text or lines etc.
i could use the odrxclass and retreive the type-string but i'd like to use
the typeid.
is that possible with opendwg c++ ? or should use
odrxclass::name() to compare with ?
thanks in advance.
sander koning
i'm not sure about rtti - you can use it over pointers (but not smart) to entities and objects: like dynamic_cast<oddbline&>(*pent) (which by the way will throw an exception if pent is not a line) or dynamic_cast<oddbcircle*>(pent.get()), whcih will return 0 if pent is not a circle. but it is not recommended to use the name() property of the type_info class, because it may differ between the different c++ compilers. moreover, it can differ between 2 versions of a same compiler.
i would recommend to use pent->isa()->name() to get the real string of the pointed type. you can even remove the "acdb" preffix and use a "normalized" form of the type, for example in interface components.
another check can be ( pent->iskindof(oddbcircle::desc()) ) which is similar to ( dynamic_cast<oddbcircle*>(pent.get()) != 0 ).
hope this helps.
best regards
chudomir
pent->isa()->name() is most reliable
thanks for your reply chudo,
i've tested both statements and pent->isa()->name() fff"> is the most reliable.
pent->iskindof(oddbcircle::desc()) fff"> didn't only gave exactly the ones i wanted, but also some extra entity types wich seemed to be related somehow
in it's ancestor's tree.
so for now i would only recommend pent->isa()->name() fff"> to check the entity-type.
with regards,
sander koning