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Subject: Re: [geometry] point on/intersects linestring?
From: Adam Wulkiewicz (adam.wulkiewicz_at_[hidden])
Date: 2013-09-03 22:14:23

Barend Gehrels wrote:
>> Also is it defined in the C++ standard what should be the
>> representation of floating point numbers? Are special values like INF
>> always available? On some compilers it's possible to enable exception
>> throwing for cases like division by 0 (I remember that e.g. Borland
>> Builder had those). Not to mention that probably in the whole
>> Boost.Geometry operations like division by 0 are avoided. So maybe it
>> would be safer to add an if-check?
> Yes, please, we indeed always do that...

Ok, done. I've moved it from strategies to detail::disjoint, I hope it's
ok. I added tests in intersects.cpp. Should I also add them for

However there is a little issue. std::numeric_limits<> isn't specialized
for boost::rationale<> (there is already a ticket for this) so this
algorithm won't work properly since min, max and epsilon are equal to 0.
This probably isn't a problem because in other places of BG those values
are also used so currently boost::rationale<> shouldn't work properly
with BG in general.

Btw, shouldn't geometry::promote_floating_point<> always promote to raw
floating point type? Currently boost::is_integral<T> trait is used to
check if this type should be promoted. If this type is some class which
means it's not intergal type, it isn't promoted to floating point type.
Shouldn't the test be changed to !boost::is_float<T> ?


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