Setting -INF, INF, NaN in the output XML

Support FAQ > Liquid XML Data Binding
Summary

I need to produce an XML document that looks like this

<BoundingBox xmin="-INF" xmax="INF"/>

How do I set the values of xmin & xmax in the code to get -INF and INF in the output XML.

Solution - Setting

Doubles and Floats have 3 'magic' values, these can be set using the following code

 INF box->SetXmax(std::numeric_limits<double>::infinity());
 -INF box->SetXmin(-std::numeric_limits<double>::infinity());
 NaN  box->SetXmin(std::numeric_limits<double>::quiet_NaN());

Note the header file limits must be included

 

#include

 

 

<limits>

 

 

 

 

Solution - Reading

Whe these values are present in the XML they can be detected using the following checks

 INF bool isPositiveInf = box->GetXmax() == std::numeric_limits<double>::infinity();
 -INF bool isPositiveInf = box->GetXmax() == std::numeric_limits<double>::infinity();
 NaN bool isNaN =  box->GetXmin() == std::numeric_limits<double>::quiet_NaN();

or

#include <float.h>
...
bool isNaN =  _isnan(box->GetXmin());



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