for versus foreach

[Dave]

Ameer Armaly wrote:
> What are the reasons/differences in using foreach over a for loop?  Is 
> it just performance or readability?
> 

I've rarely seen it either increase or decrease performance by any 
significant degree in my benchmark code, but I suppose(?) future 
compilers could more easily optimize foreach loops to unroll and/or 
vectorize with SIMD because of the semantics of foreach loops (local key 
and value variables, array length is available, etc.).

I find them easier to read and now more concise to write too since 
key/value inference was added.

foreach should make it harder to overrun buffers (either unintentionally 
or as an attack on the service or binary) too because there is always a 
length component to D arrays. It won't prevent things like DOS attacks 
on buffers made of dynamic arrays, but foreach should generally make 
looping over D arrays safer and more secure if you can use it.

- Dave

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