On Mon, Jul 17, 2017 at 05:38:23PM +0000, Nordlöw via Digitalmars-d-learn wrote:
> I'm want to define a specialization of `append()` that takes only
> static arrays as inputs and returns a static array being the sum of
> the lengths of the inputs.
>
> Have anybody already implemented this?
>
> If not, I'm specifically interested in how to most conveniently infer
> the length (as an enum) of the returned static array from the
> `.length`s of inputs (which of course must be enum-values too).
Hmm. What about:
template sumOfLengths(A...)
if (A.length > 0)
{
static if (A.length == 1)
enum sumOfLengths = A[0].length;
else
enum sumOfLengths = A[0].length + sumOfLengths!(A[1 ..
$]);
}
T[sumOfLengths!StaticArrays] append(StaticArrays...)(StaticArrays
arrays)
if (/* insert static array constraints here */)
{
typeof(return) result = void;
size_t offset = 0;
foreach (a; arrays)
{
result[offset .. offset + a.length] = a[];
}
return result;
}
T
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