From: legalize+jeeves@mail.xmission.com   
      
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   Ian Collins  spake the secret code   
    thusly:   
      
   >Richard wrote:   
   >How do you decouple your code form any system calls it makes?   
      
   Since this is comp.lang.c++, we have any number of techniques that   
   allow us to decouple ourselves from system calls without resorting to   
   link-time substitution.  Interfaces and templates are two.   
      
   >Your tone suggests that you consider link-time substitution (or   
   >interposition) something to be avoided rather then the commonly used   
   >testing technique that it is.   
      
   I avoid it because it's been problematic and harder for developers to   
   understand every time I've seen it used.  So yes, it is less desirable   
   than using interfaces or something else that is completely under   
   control of the test instead of under control of the build system.  The   
   only one I can think of that is worse than link time substitution is   
   abuse of the preprocessor.   
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