Scope rules

[Guest]

Hi!
Is the following code really correct according to the C++-standard?

int main()
{
for(unsigned int i = 0; i < 10; ++i)
;

i = 0;

return 0;
}

I thougt i would be interpreted as local variable part of the for loop
but Visual Studio .NET 2003 seams to accept the code without
complaining.

/H

 

[E. Robert Tisdale]

Is the following code really correct according to the C++-standard?

> cat main.cpp

int main(int argc, char* argv[]) {
for(unsigned int i = 0; i < 10; ++i) ;

i = 0;

return 0;
}

> g++ -Wall -ansi -pedantic -o main main.cpp

main.cpp: In function ‘int main(int, char**)’:
main.cpp:4: error: \
name lookup of ‘i’ changed for new ISO ‘for’ scoping
main.cpp:2: error: using obsolete binding at ‘i’

 

[Rolf Magnus]

Hi!
Is the following code really correct according to the C++-standard?

No, it isn't.

int main()
{
for(unsigned int i = 0; i < 10; ++i)
;

i = 0;

return 0;
}

I thougt i would be interpreted as local variable part of the for loop
but Visual Studio .NET 2003 seams to accept the code without
complaining.

AFAIK, this is a legacy. There is some compiler switch to make the compiler
correctly produce an error message for this code.

 

[red floyd]

(e-mail address removed) wrote:

AFAIK, this is a legacy. There is some compiler switch to make the compiler
correctly produce an error message for this code.

it's /Zc:forScope