Re: c++/7008: unexpected error message "var was not declared in this scope"

["Rafal Dabrowa" <rdabrowa@poczta.onet.pl>]

The following reply was made to PR c++/7008; it has been noted by GNATS.

From: "Rafal Dabrowa" <rdabrowa@poczta.onet.pl>
To: <lerdsuwa@gcc.gnu.org>, <gcc-bugs@gcc.gnu.org>,
	<gcc-prs@gcc.gnu.org>, <nobody@gcc.gnu.org>,
	<gcc-gnats@gcc.gnu.org>
Cc:  
Subject: Re: c++/7008: unexpected error message "var was not declared in this scope"
Date: Sat, 13 Jul 2002 08:12:10 +0200

 Gcc behaves inconsequently in this case. Consider the
 following code:
 
     void doit( int var )
     { struct st { char s[sizeof(var)]; } zz; }
     int main() { doit(3); }
 
 This code compiles fine, even that var is a function argument,
 not a static/global variable. Now, we convert this function to a
 template:
 
     template<class T> void doit( T var )
     { struct st { char s[sizeof(var)]; } zz; }
     int main() { doit(3); }
 
 Compiler complains in this case. Is it not strange ?
 It may be even worse. Consider we have a global
 varible named "var". In first case, compiler would
 take local variable. In second - global one. This
 inconsequence I treat as a compiler bug, which
 shall be corrected.
 
 Similar problem occurs when use constants.
 See code below. We have two functions with
 identical body, but the first one is an ordinary function,
 and the second one is a template. And compiler takes
 local N in first function, global N in second. This is not a
 correct behavior.
 -------------- code begin ---------------
 const int N = 500;
 
 void f(int var) {
     const int N = 5;
     struct { char str[N]; } zz;
     cout << "sizeof(zz) = " << sizeof(zz) << endl;
 }
 template <class T> void g(T var) {
     const int N = 5;
     struct { char str[N]; } zz;
     cout << "sizeof(zz) = " << sizeof(zz) << endl;
 }
 int main() { f(1); g(1); }
 -------------- code end ---------------
 
 With regards --
 
 Rafal Dabrowa
 
 ----- Original Message -----
 From: <lerdsuwa@gcc.gnu.org>
 To: <gcc-bugs@gcc.gnu.org>; <gcc-prs@gcc.gnu.org>; <nobody@gcc.gnu.org>;
 <rdabrowa@poczta.onet.pl>
 Sent: Thursday, July 11, 2002 4:39 PM
 Subject: Re: c++/7008: unexpected error message "var was not declared in
 this scope"
 
 
 > Synopsis: unexpected error message "var was not declared in this scope"
 >
 > State-Changed-From-To: open->closed
 > State-Changed-By: lerdsuwa
 > State-Changed-When: Thu Jul 11 07:39:20 2002
 > State-Changed-Why:
 >     Not a bug.  According to the standard, section 9.8p1:
 >
 >       Declarations in a local class can use only type names,
 >       static variables, extern variables and functions, and
 >       enumerators from the enclosing scope.
 >
 >     The 'var' which is a function parameter is not allowed.
 >
 >
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&p
 r=7008