foreach

[Steven Schveighoffer via Digitalmars-d]

On Thu, 12 Jun 2014 23:34:27 -0400, Manu via Digitalmars-d  
<digitalmars-d at puremagic.com> wrote:

> On 13 June 2014 13:04, Daniel Murphy via Digitalmars-d
> <digitalmars-d at puremagic.com> wrote:
>>
>> i,j,k,etc work just fine.  Are you really nesting your loops that  
>> deeply?
>
> Giving explicit names pollutes the local namespace, and the point
> below about unreferenced variable warnings if you give explicit names.

i, j, k are traditionally loop variables. People have been using them for  
decades without conflicting their other variables.

>>
>> The compiler's optimizer will do that just fine.
>
> Not necessarily. The range might be a lib, and non-pure. The compiler
> can't optimise/inline/eliminate the call if it doesn't have code.
> In my experience this is common, I frequently wrap C api's in D-style
> ranges. Potentially a lot of unnecessary calls to
> C_API_GetItem(itemIndex).

2 options:

foreach(i; 0..r.walkLength)
{
}

or

while(!r.empty)
{
    r.popFront();
}

-Steve