c++11 - C++: Overloaded template alias -

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There is currently a special standard library programming, and I think it is necessary for me in a particular case: 

  named place std {// key, value template & class; Class K, class V & gt; Vector_map = other_name location :: vector_map and lieutenant; K, V & gt; // key, value, compare template & lt; Class K, Class V, Class C & gt; vector_map = other_namespace :: vector_map & lt; By using V, C & gt; }   
 This works, however, does not work, does not surprise. But what are my options to achieve this? I have thought of using the preprocessor, but I want to know what you think people think.  
 I want to be able to select aka template category in another name, if possible.  
 The solution (in my case) was to add a default value instead of several values:  
  name space std {// key, compare prices, templates; Square k, class V, square c = default_mountain & gt; vector_map = other_namespace :: vector_map & lt; By using V, C & gt; }  " Use the  to use .  
  template & lt; Class A, Class B, Class ... C & gt; Struct vector_map_helper {type = other_namespace :: vector_map & lt; A, B & gt; }; Expert for // 3: template & lt; Class A, Class B, Class C & gt; Struct vector_map_helper & lt; A, B, C & gt; {Type = other_name location :: vector_map & lt; A, B, C & gt; }; Template & lt; Class A, Class B, Class C, Class D, Class ... Z & gt; struct vector_map_helper & lt; A, B, C, D, Z ... & gt; // Error 4 or more template & lt; Class A, Class B, Class ... C & gt; Using vector_map = typename vector_map_helper & lt; A, B, C ... & gt; :: type; In general, even if you are implementing the  std  library, you should avoid adding any "user facing" interface to your  std . Those that do not come from the  std  library, and the stuff you support must match the  std  specifications.  
 The non-  std  extensions for a  std :: ext  namespace make both of these existing codes or a  nonstd  Fails to compile or work, and to avoid training in bad habits about what your programmer-user has in the  std .   / html>

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