Reference Variable (C++ jargon) - is there such a beast?

[HJarausch]

Gives 
    
    
      template R: untyped = A.M[k] 
    
    Run

just an abbreviation s.t. 
    
    
      R.x
    
    
    Run

is equivalent to 
    
    
      A.M[k].x
    
    
    Run

? In that case it's only more comfortable but not speedier.