c++ - Constructor-style casting in function call parameters -


I do not understand that using the constructor-style casting fails to compile the following code: 

  template & lt; Typename T & gt; Zero Efu (Constant T & T) {} Int Main () {EF (Unsigned Four (0)); }   
 Errors are:  
     
  •   Error: the expected expression of expression should already be ????  
  •    
     Although these three syntax are correct  
  •   error: expected '(' function-style cast or type    
      
      templates for building  T   
     Then this kind of place is clearly to blame here.  
     I thought Was it possible to relate to our old friend in some way, so I tried, which should get rid of this type of ambiguity, but no luck:  
      template   
     but still:  < ul> 
  •   ERROR: Expected prefix for the GCC "without signing" .  
  •   Error: Expected '(function-style cast or page)    
     So my question is why is not that function, allowing one type home in style caps? It does not seem unclear to me.  
       Note  : I know that I  foo & lt; Unsigned char & gt; (0) , but does not answer this question;)   
     
     
     
     < Code> [C ++ 11: 5.2.3 / 1]:  A  Simple-type-specifier  (7.1.6.2) or  typename-specifier  (14.6 ) After that, the parenthesized  expression-list  creates a value of the specified type according to the expression list.  [..]    
     Checking grammar, we see that  unsigned char from  simple-typed-specialifier  Production happens by uniting two of them.  
     As evidence of the rumor loss, Table 10 is telling the opposite, which I can start myself a while ago (: P) The table title is called "Specification (Optional)" (optional Note the plural), and refer to the route given below:  
     
      [C ++ 11: 5.2.3 / 2]:   [. .]  summarize  simple-type-specifiers  and the type of valid  combination  specified by them in Table 10 is.   (emphasis my)     
     Now, in some cases the permission of the combination of  simple-type-specifiers  Is:  
     
      [C ++ 11: 7.1.6.2/3]:  When multiple  simple-type-specifiers  are allowed, They may be intermixed freely with other  announcement-specifiers  in any order  [..]    
    . .. but there is no indication that it is in the case of functional notation, which clearly Area " a   simple-type-specifier " - singular.  
      That's why GCC is correct, and the visual studio is wrong.   
      Why  this is the case ... well, I do not know. I suspect that we can come in some vague edge case, but there is a good thing in the comments given below so that this function is incompatible with call syntax, because the name of the function can not contain empty spaces.

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