Re: Scope of variables declared in if/while/for

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1 total messages Started by rjl Wed, 27 Sep 1995 17:40

#2052

Author: rjl
Date: Wed, 27 Sep 1995 17:40

31 lines
1835 bytes

In article <MATT.95Sep25095657@physics2.berkeley.edu> you write:
>Do I have this right?  If so, doesn't this break a lot of old C++
>programs that depended upon variables declared in the 'for' statement
>being local to the enclosing scope.

Yes, it sure does.  However this was first talked about back when the
ARM was written.  Good compilers will let you do both.  Here's what
gcc-2.7.1 will do for your code snippet -

(Default options)
xx.cc: In function `int main()':
xx.cc:6: warning: name lookup of `i' changed for new ANSI `for' scoping
xx.cc:1: warning:   using obsolete binding at `i'

(-ansi -pedantic -ffor-scope)
xx.cc: In function `int main()':
xx.cc:6: `i' undeclared (first use this function)
xx.cc:6: (Each undeclared identifier is reported only once
xx.cc:6: for each function it appears in.)

Regards,
	Rohan
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