• J.Frank (6/6) Nov 08 2015 Hello,
• Rikki Cattermole (9/14) Nov 08 2015 opApply if you want 0 .. N iterations during for a foreach statement and...
• J.Frank (5/11) Nov 08 2015 No, that won't help. I want to be able to iterate over a data set
• rsw0x (3/15) Nov 08 2015 FWIW since you mentioned Java, if you're accustomed to Java 8

J.Frank <joe cerberon.net> writes:

Hello,

I am looking for something like the "Iterator" Interface in Java 
or PHP.
Is there something comparable in D that can be used with foreach?

Thanks,

J.Frank

Rikki Cattermole <alphaglosined gmail.com> writes:

On 09/11/15 12:40 AM, J.Frank wrote:
 Hello,

 I am looking for something like the "Iterator" Interface in Java or PHP.
 Is there something comparable in D that can be used with foreach?

 Thanks,

 J.Frank

opApply if you want 0 .. N iterations during for a foreach statement and 
having it reset each time.

Otherwise you want ranges :)

An input range is more or less an iterator as you would think of it.
You only need popFront, front and empty. But here is the "official" 
interface. http://dlang.org/phobos/std_range_interfaces.html#InputRange
You can have structs an an input range, it is quite common since it 
doesn't allocate.

J.Frank <joe cerberon.net> writes:

On Sunday, 8 November 2015 at 11:47:41 UTC, Rikki Cattermole 
wrote:
 opApply if you want 0 .. N iterations during for a foreach 
 statement and having it reset each time.

No, that won't help. I want to be able to iterate over a data set 
of infinite size.

 Otherwise you want ranges :)

 An input range is more or less an iterator as you would think 
 of it.
 You only need popFront, front and empty.

Ah yes, that's what I missed. Looks good. Thank you. :)

rsw0x <anonymous anonymous.com> writes:

On Sunday, 8 November 2015 at 11:57:16 UTC, J.Frank wrote:
 On Sunday, 8 November 2015 at 11:47:41 UTC, Rikki Cattermole 
 wrote:
 opApply if you want 0 .. N iterations during for a foreach 
 statement and having it reset each time.

 No, that won't help. I want to be able to iterate over a data 
 set of infinite size.

 Otherwise you want ranges :)

 An input range is more or less an iterator as you would think 
 of it.
 You only need popFront, front and empty.

 Ah yes, that's what I missed. Looks good. Thank you. :)

FWIW since you mentioned Java, if you're accustomed to Java 8 
streams they're very similar to D's ranges.