Any chance to call Tango as Extended Standard Library

[Andrei Alexandrescu]

Sergey Gromov wrote:
> Sun, 18 Jan 2009 15:32:26 -0800, Andrei Alexandrescu wrote:
> 
>> Sergey Gromov wrote:
>>> Sun, 18 Jan 2009 07:21:55 -0800, Andrei Alexandrescu wrote:
>>>
>>>> http://www.digitalmars.com/d/2.0/statement.html#ForeachStatement
>>>>
>>>> Scroll down to "Foreach over Structs and Classes with Ranges". The 
>>>> changelog reflects that too:
>>> How do I implement a range that supports more than one pass?  From the
>>> docs, all ranges seem to be essentially Input ranges currently.  That is
>>>
>>> MyIterable collection;
>>> foreach (element; collection) {} // OK, iterates
>>> foreach (element; collection) {} // oops, it's empty!
>> Note that the range is being copied into a hidden variable, so after the 
>> first iteration the collection will still hold its ground.
> 
> Unless it's a class you mean?

Yah, ranges are meant to have value semantics. If you have a class 
container exposing ranges, define the range separately from the 
container itself:

MyIterable collection;
foreach (element; collection.all) {}
foreach (element; collection.all) {}


Andrei