[geos-devel] compiling problem

strk at refractions.net strk at refractions.net
Sat Sep 11 13:17:04 EDT 2004

On Sat, Sep 11, 2004 at 07:12:34AM +0200, Michel Garand wrote:
> Greetings!
> I am compiling GEOS 2.0.0 on a Debian machine
> why do i get the following error?
> ......
> LineString.cpp:221: comparison of distinct pointer types `geos::Geometry
> *' and `const geos::LineString *' lacks a cast

Because that comparison lacks a cast :<
Actually the two pointers are of the same size, and the objects they
point to are one a subclass of the other.

I never got a compiler error
[g++ (GCC) 3.3.2 20031005 (Debian prerelease)]

Substitute line 221 of source/geom/LineString.cpp from:
        if ( in != this ) delete(in);
        if ( (LineString *)in != this ) delete(in);

and see if your compiler likes it.

Other places omit that cast, though..

What's your compiler version ?


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