Pointers vs functional or array semantics
ketmar via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Sat Feb 25 03:15:53 PST 2017
data pulverizer wrote:
> I have noticed that some numerical packages written in D use pointer
> semantics heavily (not referring to packages that link to C
> libraries). I am in the process of writing code for a numerical
> computing library and would like to know whether there times when
> addressing an array using pointers conveys performance benefits over
> using D's array or functional semantics?
using `arr.ptr[n]` instead of `arr[n]` bypasses bounds checking. this
may be diserable in tight loops (while disabling bounds checking
globally is not).
but note that `foreach (int n; arr)` doesn't do bounds checking in loop
too (afair), so you prolly better use `foreach` instead of pointers.
this way your code will be fast, but still safe.
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