From: daniel.kruegler@googlemail.com   
      
   On 2013-11-21 01:47, Martin Bonner wrote:   
   > I think it is legal to add overloads to the std namespace provided your   
   > overloads involve your types.  Technically, overloading in std for builtin   
   > types is not permitted (but it might work).   
      
   No, the library specification is pretty clear not to allow adding   
   overloads to namespace std. You are allowed to add template   
   *specializations* to namespace std, if at least one template argument is   
   a user-defined type, but this also binds you to the contract, that your   
   implementation satisfies the requirements of the standard library: This   
   is essentially 17.6.4.2.1 [namespace.std] p1:   
      
   "The behavior of a C++ program is undefined if it adds declarations or   
   definitions to namespace std or to a namespace within namespace std   
   unless otherwise specified. A program may add a template specialization   
   for any standard library template to namespace std only if the   
   declaration depends on a user-defined type and the specialization meets   
   the standard library requirements for the original template and is not   
   explicitly prohibited."   
      
   HTH & Greetings from Bremen,   
      
   Daniel Krügler   
      
      
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