When I have a couple of for loops sequentially, and they use the same
counter name, i.e. for(int i=0; i<x; i++), Visual C++ complains of variable
redeclaration. I thought that the i stayed within the scope of the for loop?
The same code on gcc doesn't give this error (not on the default settings at
least). Is VC being fussy, and can I turn this fussiness off?
--
Nick H
7  2796 
Nick Howes wrote: When I have a couple of for loops sequentially, and they use the same
counter name, i.e. for(int i=0; i<x; i++), Visual C++ complains of
variable redeclaration. I thought that the i stayed within the scope
of the for loop? The same code on gcc doesn't give this error (not on
the default settings at least). Is VC being fussy, and can I turn
this fussiness off?
It's a VC6 bug. Download the free VC++ Toolkit 2003 from Microsoft's site,
and use that in place of the VC6 compiler. It comes with the full VC++ 2003
Pro edition optimizing compiler and standard library.
- Pete
"Pete C." <x@x.x> wrote in message
news:D9****************@newsread1.news.pas.earthli nk.net... Nick Howes wrote: When I have a couple of for loops sequentially, and they use the same
counter name, i.e. for(int i=0; i<x; i++), Visual C++ complains of
variable redeclaration. I thought that the i stayed within the scope
of the for loop? The same code on gcc doesn't give this error (not on
the default settings at least). Is VC being fussy, and can I turn
this fussiness off?
It's a VC6 bug.
It's not really a bug, it's a relic of pre-standard C++.
Download the free VC++ Toolkit 2003 from Microsoft's site,
and use that in place of the VC6 compiler. It comes with the full VC++
2003 Pro edition optimizing compiler and standard library.
If you don't want to switch compilers, an alternative is this macro. Place
it at the beginning of each file.
#define for if (0); else for
Nick Howes 2004-06-15 : When I have a couple of for loops sequentially, and they use the same
counter name, i.e. for(int i=0; i<x; i++), Visual C++ complains of variable
redeclaration. I thought that the i stayed within the scope of the for loop?
The same code on gcc doesn't give this error (not on the default settings at
least). Is VC being fussy, and can I turn this fussiness off?
You are a bit off-topic here, but anyhow...
I don't know about VC6, but in VC .NET it's an option in project
properties -> C/C++ -> language. I don't know it's precise naming in
English since I have it in Italian, but it should be something like
"impose for cycle scope conformity".
By default it's turned off, which in my opinion is plain wrong.
I wish I knew a way to have it turned on by default for every new project
I start...
Walter Tross
"Walter Tross" <wa****@waltertross.com> wrote in message
news:sw***************************@40tude.net... Nick Howes 2004-06-15 :
When I have a couple of for loops sequentially, and they use the same
counter name, i.e. for(int i=0; i<x; i++), Visual C++ complains of
variable redeclaration. I thought that the i stayed within the scope of the for
loop? The same code on gcc doesn't give this error (not on the default
settings at least). Is VC being fussy, and can I turn this fussiness off?
You are a bit off-topic here, but anyhow...
I don't know about VC6, but in VC .NET it's an option in project
properties -> C/C++ -> language. I don't know it's precise naming in
English since I have it in Italian, but it should be something like
"impose for cycle scope conformity".
Sorry about the OT-ness, should've looked up a visual studio newsgroup.
Thanks everyone for your advice anyhow, there's no such option in VC6 but i
will look up that VC++ Toolkit 2003 and have a look.
Cheers
Nick H
Walter Tross wrote:
Nick Howes 2004-06-15 :
When I have a couple of for loops sequentially, and they use the same
counter name, i.e. for(int i=0; i<x; i++), Visual C++ complains of variable
redeclaration. I thought that the i stayed within the scope of the for loop?
The same code on gcc doesn't give this error (not on the default settings at
least). Is VC being fussy, and can I turn this fussiness off?
You are a bit off-topic here, but anyhow...
<snip>
au contraire --
This is very *much* on topic. Prior to the (pre)standard change to for-loop
scoping rules, variables declared in a for-loop were still in scope outside of
the loop.
This conformity issue, in part, is due to the very *long* time that it took for
the standard to actually be finalized/approved/ratified in the 90's.
"Nick Howes" <n.*******@warwick.ac.uk> wrote in message news:<ca**********@wisteria.csv.warwick.ac.uk>...
[ ... ] Sorry about the OT-ness, should've looked up a visual studio newsgroup.
Thanks everyone for your advice anyhow, there's no such option in VC6 but i
will look up that VC++ Toolkit 2003 and have a look.
VC++ 6 has an option (/Za) that enforces the correct scope for
variables defined in the header of a for loop (etc.) The problem is
that when you turn this switch on, it enforces a number of other
rules, and its standard headers (among other things) won't compile
when those rules are enforced -- the result is that even though the
compiler itself has the capability, the remainder of the
implementation renders it unusable.
--
Later,
Jerry.
The universe is a figment of its own imagination.
Pete C. wrote: Nick Howes wrote:
When I have a couple of for loops sequentially, and they use the same
counter name, i.e. for(int i=0; i<x; i++), Visual C++ complains of
variable redeclaration. I thought that the i stayed within the scope
of the for loop? The same code on gcc doesn't give this error (not on
the default settings at least). Is VC being fussy, and can I turn
this fussiness off?
It's a VC6 bug. Download the free VC++ Toolkit 2003 from Microsoft's site,
and use that in place of the VC6 compiler. It comes with the full VC++ 2003
Pro edition optimizing compiler and standard library.
I know we're getting OT here, but when you say "use that in place of the
VC6 compiler" do you mean that the v13 MS C++ compiler is compatible
with Visual Studio 6, i.e. interchangeable with the v12 compiler? I
wasn't aware of that; it would be very interesting to me if true.
--
Mike Smith This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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