I'm not sure I have the latest in either books or compilers to do it 
properly, so I thought I'd ask here. In  concocting some GCD code for the 
next SNIPPETS release, I came across a problem with template-based code that 
required the use of the % operator. In C, I have to make type-specific 
versions, so the function which works with doubles simply uses fmod() instead 
of %. However, I'm kinda lost when it comes to writing a template-based 
equivalent which will need to either use the % operator or call fmod() 
depending on the type of its arguments and return value. 
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