Setting -INF, INF, NaN in the output XML

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

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());

Article ID: 78, Created: 5/4/2011 at 2:34 PM, Modified: 5/4/2011 at 2:34 PM

Setting -INF, INF, NaN in the output XML

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