Python doesn't have c style for loops and the way you'd do this is use
xrange to create an iterator over a range of numbers, then use a high level
for loop. This seems like the cleanest solution for rust to me.
Psuedo-code:
for range(start, end) |i| {
char c = buf[i];
...
if (c == uninteresting) {
continue;
}
...
}
Seems like range and some related functions should be considered for the
standard library to support this style.
On Wed, Oct 24, 2012 at 8:58 AM, Chris Double <[email protected]>wrote:
> On Wed, Oct 24, 2012 at 8:19 PM, Henri Sivonen <[email protected]> wrote:
> > Looping over a part of an array by index and moving on immediately
> > when a “not interested” condition matches.
> >
> > Stuff like
> > for (int i = start; i < end; i++) {
> > char c = buf[i];
> > ...
> > if (c == uninteresting) {
> > continue;
> > }
> > ...
> > }
>
> You might be able to bend macros into something you want. For example:
>
> macro_rules! my_loop(
> ($cond:expr, $inc:expr, $body:expr) => {
> while $cond {
> while $cond {
> $body;
> $inc;
> }
> $inc;
> }
> };
> )
>
> fn main () {
> io::println("hello");
> let mut i = 0;
> my_loop!(i < 10, i += 1, {
> if i < 5 { break; }
> io::println("foo");
> })
> }
>
> Here 'break' inside the macro is your 'continue' and in the example "i
> < 5" is the uninteresting check. I don't know how, in rust, to change
> all uses of some_string into "($inc; loop)" but if you can you can do
> better than this example.
>
> Chris.
> --
> http://www.bluishcoder.co.nz
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