c++ - Template parameters not deducible in partial specialization -

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I have a similar problem but it may be that I'm still doing something different, so I do not have any Ask me

There are some types that will be tagged with tag structure: 

  template & lt; Typename geometry = void, enable typename = null & gt; Structure tag {typedef zero type; };   
 And point and triangle tags are introduced:  
  struct point_tag {}; Structure triangle_tag {};   
:  
  template  to create a point type using  std :: vector  & Gt; Structure tag & lt; Std :: vector & lt; Double & gt; & Gt; {Typed point_tag type; }; Type of a triangle in the form of the    
 and  std :: arrays  template:  
  template & lt; Typename point & gt; Triangle = Type name std :: enable_if & lt; Std :: is_base_of & lt; Typename tag & lt; Point & gt; :: type, point_tag & gt; :: value, std :: array & lt; Point, 3 & gt; & Gt; :: type;   
 This argument is enabled if the argument is actually the  point_tag  as the  dot  parameter,     , I would like to tag  all the triangles  from  triangle_tag  in this way:  
  template & lt; Typename point & gt; Strip tag & lt; Triangle & lt; Point & gt; & Gt; {Typed triangular tip type; };   
  std :: array  is given the only place and the composite / inheritance is not found, because creation causes problems with heritage, though compilation error Fails with  
  g ++ -std = c ++ 1y main.cpp -o key main.cpp: 31: 8: error: template parameters can not be reduced in partial expertise Is: strip tag & lt; Triangle & lt; Point & gt; & Gt; ^ Main.cpp: 31: 8: Note: A point ???   
 If I do not depend on enabling  triangles  based on the  triangle  tag, but do it for all types of it:  
  template & lt; Typename point & gt; This works by using triangle = //, but there is no restriction for tagging points with point_tags. Std :: Array & lt; Point, 3 & gt;;   
 So the compile works fine. However, then the triangle is an  triangle , and I am using those functions to minimize the function template for which  enable_if  fails for viable template arguments Functions are not dependent on the container interface for templates because sometimes the built-in interface  is exactly the same , but the operation semantics is different For example, the triangle is a closed maturation The line segment (including operations on 3 sides), and a point series is an open-end line segment includes operations (2 sides). All tasks require direct access operators that are the only requirement for template parameters, which, when without implementing the  enabled_if  restrictions, in the function template leads to ambiguity - all linked Articles include.  
 is here  
 Am I missing? How to get this problem?   
 
 
 Do not use your  enabled  template parameters? 
 Something like this:  
  template & lt; Typename point & gt; Structure tag & lt; Std :: array & lt; Point, 3 & gt;, type name std :: enable_if & lt; Std :: is_base_of & lt; The typename tag & lt; Point & gt; :: type, point_tag & gt; :: Price & gt; :: type & gt; {Typed triangular tip type; };   
 (OK, you repeat  enable_if  ...)

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