72501454   
   From: pete@versatilecoding.com   
      
   On 2012-01-14 02:28:12 +0000, Robi-Wan-Kenobi said:   
      
   >   
   > i just discovered something strange: I had two template functions with   
   > the same name and signature. Both were defined and declared in   
   > different cpp-files.   
   >   
   > […]   
   >   
   > What i observed when i was fixing a bug was that the call of myFunc in   
   > FileB called the template function from FileA!   
   >   
      
   Formally, if the two definitions are different, that's a violation of   
   the One Definition Rule, and the behavior of the program is undefined.   
      
   In practice, what happens is that the linker sees two template function   
   instantiations with the same mangled name and picks one, on the   
   assumption that they're the same. That's because a single template   
   definition, in a header file, that is used in two source files will   
   create two instantiations, one in each source file. That's okay, but   
   having two copies of the same template instantiation is, at best,   
   confusing, so the linker picks one.   
      
   --   
    Pete   
   Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The   
   Standard C++ Library Extensions: a Tutorial and Reference   
   (www.petebecker.com/tr1book)   
      
      
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