[Gdal-dev] RE: need RTTI for OGR (Windows)

[Chapman, Martin]

Mateusz,

I agree, good point.

Best regards,
Martin

-----Original Message-----
From: gdal-dev-bounces at lists.maptools.org [mailto:gdal-dev-bounces at lists.maptools.org] On Behalf Of Mateusz Loskot
Sent: Tuesday, April 11, 2006 11:59 AM
To: gdal-dev at lists.maptools.org
Subject: Re: [Gdal-dev] RE: need RTTI for OGR (Windows)

Chapman, Martin wrote:
> [...] You will just have to use a C style cast like:

It's better to use C++ static_cast<>() operator than C style.

> OGRGeometry *poGeometry ....  // not null ... switch
> (poGeometry->getGeometryType()) { ..... case wkbPolygon: MyFunc(
> (OGRPolygon*)poGeometry);

MyFunc( static_cast<OGRPolygon*>(poGeometry) );

Here static_cast<>() will work well because it's used to cast
down the hierarchy what's very common/.

NOTE: when if poGeometry points not to OGRPolygon
base class, then it will cause run-time error.
So, it's not safer than dynamic_cast but safer than C style.
NOTE 2: static_cast<>() is very native and
does not decrease performance in any way.

NOTE 3 about NOTE 2:
Generally, casting is pretty expansive operation, so there is always
some overhead :-)

Cheers
-- 
Mateusz Łoskot
http://mateusz.loskot.net
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