[Proj] Code style in Proj

[Thomas Knudsen]

Yes, exactly... declarations must be at top of scope in C, while C++ (seen
from a C perspective) inserts an implied do { ... } while (0); around the
actual scope of stray declarations. Thanks for clarifying that: My brain is
so C style hardwired that I didn't consider the case of declaring things
anywhere else than at top of scope.


2018-04-24 12:05 GMT+02:00 Mateusz Loskot <mateusz at loskot.net>:

> On 24 April 2018 at 11:45, Thomas Knudsen <knudsen.thomas at gmail.com>
> wrote:
> >> In C too, but since C99.
> >
> > AFAIK this only applies to the "for (int i = 0;  i < n; i++)" syntax.
> >
> > while (...) {
> >     int i = 123, j = 345;
> >     k = i + j;
> > }
> >
> > has been correct (and imho, preferable) syntax since K&R C
>
> AFAIK, it's about compound statement.
> C89 requires declaration at the top of blocks, while C99 lifts that:
>
> $ cat test.c
> int main()
> {
>     int i = 0;
>     while (i < 10)
>     {
>         int j = 345;
>         i = i + j;
>     }
>
>     {
>         int z = 0;
>         z = 1;
>     }
>     int x = 1;
> }
>
> $ gcc -std=c89 -pedantic test.c
> test.c: In function ‘main’:
> test.c:14:5: warning: ISO C90 forbids mixed declarations and code
> [-Wdeclaration-after-statement]
>      int x = 1;
>      ^~~
>
> $ gcc -std=c99 -pedantic test.c
> $
>
>
> Best regards,
> --
> Mateusz Loskot, http://mateusz.loskot.net
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