c++ dynamic typecasts... (just nosy)

[Axel Kittenberger]

Well actually I'm just nosy... dynamic_cast<type-it>(expr)

How actually does the c++ realize this? I mean does it know at runtime the
type of expr? Does it add some ID fiels to the class "structure"? If so how is
this ID caluclated? 

Well I did search the web a little regarding this, but only found the
how-to-use related info... and reading into gcc-cp source does first confronts one
with details without knowing the schematics....

Maybe has anybody has some literature to point at?
Or a quick answer? :)

Thanks,
- Axel

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