c++ - using a conditional type in a .cpp file -

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I have a templated class and a type that depends on the template. How can I use this in my CCP file?

object.hpp: 

  pair_d = std :: pair and lt; Double, double> Pair_f = std :: pair & lt; Float, float & gt; Template & lt; Typename T & gt; Class Object {Public: Static_AstTort (Study :: ISIm ; value; std :: is_same : value, "type is not allowed"); Pair = typename std :: conditional & lt; Std :: is_same & lt; T, float & gt; :: value, pair_f, pair_d & gt; :: By typing; // conditional type const pair doSomething (T, T) function using const; }   
 object.cpp  
  #include "object.hpp" template & lt; Typename T & gt; Const pair object & lt; T & gt; :: doSomething (TT1, TT2) const {// ....}   
 but I'm getting:  
 
 Error: Unknown type name 'pair'   
 How can I use the 'pair' type in my .cpp file?  
 
 
 
     
  1.  
     Arguments have been named with the same name  (t T, TT) , separate those names.   
  2.  
     Do not do this, you have divided the template declaration / definition into CPP and a header file.  
  3.  
      
  4.  
     You forgot about a  const  qualification on a return type in the definition (which is in the declaration).   
  5.  
     You are not a  typename  keyword for a dependent name.    
     Your definition should be:  
      template & lt; Typename T & gt; Const typame object & lt; T & gt; :: Pair object & lt; T & gt; :: doSomething (TT1, TT2) const {// stuff}   
     or (to avoid the dependent name):  
      template & Lt; Typename T & gt; Auto Object & lt; T & gt; :: doSomething (TT1, TT2) const - & gt; Const pair {// stuff}

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