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POInterpret a string as it refers to an in program variable. Geant4 units
 

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  1. POInterpret a string as it refers to an in program variable. Geant4 units
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    <p>So, I understand that this is not something built into the language (i.e. there is no eval() method in c++). I also understand that it is very difficult to associate the contents of a string input at runtime with a variable name from the program, since most of that info goes away. Nevertheless...</p> <p>I am trying to write a little class to allow users in my research group to add materials and material properties into a database file and call those materials up with one command so that material construction is easy in Geant4. Unfortunately, Geant4 uses a header file to define actual variables for these units such as cm3, mm, MeV, and kg to convert units into the internal Geant4 system of units. I don't believe there is any kind of map that links these to their corresponding strings. The fact of the matter is, Geant4 is for physics modelling, and there are a butt ton of units. There is no real way I can map them all, either, since Geant4 is expandable and some new physics code may come along that wants a new unit I don't know about.</p> <p>What I would like to do is get the string that describes the unit from the text file and somehow match that to the actual variable of the same name so I can perform the conversion. Is there any way to hack and slash this out, or is it totally impossible (or totally nearly impossible)?</p> <p>Of course I could make people convert to the internal units for all of their database entries, but that could quickly get ugly and be a large source of hard to track down error (15 places before the decimal looks a lot like 14).</p> <p>Thanks</p>
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