c++ - What does it mean when a char or wchar_t == -1? -


Why would it compare the value of a character in the visual studio (the first one four, now a wchar_t) -

1?

I have many illegal checks against 1: 

  TCHAR ch; ... if (f == - 1)   
 the coverage is telling me that "ch == -1" is always false regardless of its operand value. " 
 Now, it was originally written to use four values ​​instead of wchar_t, and it was upgraded when Unicode support was needed. I need to know that Checking against "four f;" 1 so that I can do a similar test against wchar_t.   
 
 
 Integer constant  EOF  is usually defined for  -1  if it indicates what your code is checking (where On  ch  has come), then related to  wchar_t  comparison  WEOF  and looks like a suitable Windows TCHR macro. / P> 
 PS: Fully told in the comments, as the value was changed to  char  or  wchar_t , it would be sent to  EOF  Or is too late to compare with  WEOF : Many encodings use four  '\ xff'  as a valid letter, and such Converse After the loan, the code can be different from the EOF itself: the variable  ch  type  int  /  wint_t  for any type of comparison /  _TINT  must be valid.

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