Flatten range of ranges

[Ali Çehreli]

Ali Çehreli wrote:
> new to d wrote:
>> Is there any function in phobos that does something like that:
>>
>> auto a = [[1,2],[3,4]];
>> assert(equals(flatten(a), [1,2,3,4]));
>>
>> I am just learning D and ca't find anything like that in the docs.
> 
> How about chain:
> 
>   http://digitalmars.com/d/2.0/phobos/std_range.html#chain

Sorry, of course that's not what you wanted... :(

Ali