import for iterator|crack language

[limor cohen]

hi,
which import should I use for iterator in crack programming language?

[Michael Muller]

See the "iteration protocol" - http://www.mindhog.net/~mmuller/projects/crack/Manual-0.9.html#the_iteration_protocol

In short, containers usually have a iter() method that returns an iterator object which has elem() and next() methods.  The for statement hides this for you.

You can also do 'for (i :on collection)' if you want 'i' to be the iterator rather than the element.

On Tue, Mar 4, 2014 at 1:43 PM, limor cohen <limor...@gmail.com> wrote:

hi,
which import should I use for iterator in crack programming language?

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[limor cohen]

ok..
but when i tried to define an "Iterator I", i got this message:"ParseError:: Unknown identifier Iterator".

בתאריך יום שלישי, 4 במרץ 2014 10:47:22 UTC-8, מאת mindhog:

[limor cohen]

help?

בתאריך יום שלישי, 4 במרץ 2014 11:00:11 UTC-8, מאת limor cohen:

[Michael Muller]

On Tue, Mar 4, 2014 at 2:40 PM, limor cohen <limor...@gmail.com> wrote:

help?

בתאריך יום שלישי, 4 במרץ 2014 11:00:11 UTC-8, מאת limor cohen:

ok..
but when i tried to define an "Iterator I", i got this message:"ParseError:: Unknown identifier Iterator".

There's no general iterator class in Crack.  Each container type has its own iterator type.

Also, due to a current "wart" in the language, you can't access the types directoy :-) So, for example, "Array[int].ArrayIter i" won't work.

You typically don't care, though because you can define a new iterator variable like this:

  Array[int] arr = {};

  i := arr.iter();

If you really want access to the iterator type, what you _can_ do is access them with the typeof() operator and then alias them: 

  alias IntArrayIter = typeof(Array[int]().iter();

  IntArrayIter i;

  i = arr.iter();

[limor cohen]

Okay .. if I want to move the directory with the iterator, how do I do it?
Is that possible?

בתאריך יום שלישי, 4 במרץ 2014 12:20:14 UTC-8, מאת mindhog:

[limor cohen]

help?

בתאריך יום שלישי, 4 במרץ 2014 15:02:37 UTC-8, מאת limor cohen:

[Michael Muller]

limor cohen wrote:
> Okay .. if I want to move the directory with the iterator, how do I do it?
> Is that possible?

I'm not sure I understand the question. Are you iterating over a
crack.fs.Path object? If so, we don't currently have a wrapper for the
rename() function, which is what you would need to move a directory under
unix.

Your options are:

1) Add the rename() function to crack/runtime/Init.cc, then add a rename()
wrapper to crack.fs.Path and its implementations. (Then send us the patch and
indicate your willingness to have it distributed under a BSD 2 license with
the rest of Crack :-)
2) Use crack.fs.process to shell out to 'mv'
3) directly import rename from the shared library where it is defined:
import "libc.so.6" rename;
void rename(byteptr s, byteptr d);

rename(CString(file1).buffer, CString(file2r).buffer);

If you're using arbitrary strings, be sure to wrap them in
crack.lang.CString, as these are guaranteed to be null terminated while
arbitrary strings are not.

>
> בתאריך יום שלישי, 4 במרץ 2014 12:20:14 UTC-8, מאת mindhog:
> >
> >
> >
> >

> > On Tue, Mar 4, 2014 at 2:40 PM, limor cohen <limor...@gmail.com<javascript:>

> >> email to crack-lang-de...@googlegroups.com <javascript:>.

> >> For more options, visit https://groups.google.com/groups/opt_out.
> >>
> >
> >
>
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> You received this message because you are subscribed to the Google Groups "crack-lang-dev" group.
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