On Tuesday, 17 August 2021 at 13:14:44 UTC, Steven Schveighoffer
wrote:
On 8/17/21 8:21 AM, Ferhat Kurtulmuş wrote:
Hello folks,
Hope everyone is doing fine. Considering the following code,
in the first condition, I am extracting the type Point from
the slice Point[]. I searched in the std.traits, and could not
find a neater solution something like ElementTypeOf!T. Is
there any neater solution for it? Thanks in advance.
```d
static if (isArray!VecPoint){
VecPoint dummy;
alias Point = typeof(dummy[0]);
} else static if (isRandomAccessRange!VecPoint){
alias ASeq2 = TemplateArgsOf!VecPoint;
alias Point = ASeq2[0];
} else
static assert(0, typeof(VecPoint).stringof ~ " type
is not supported");
```
If you want the element type of a range (i.e. the thing
returned by `range.front`), you can use `ElementType!T` (from
std.range.primitives).
This returns the element type of the range, which for every
array *except* character arrays, gives you the element type of
the array.
If you want always the element type of the array, even for
auto-decoded ranges, use `ElementEncodingType!T`.
If you know it's an array, you can just use Paul's solution.
Your `isRandomAccessRange` branch seems very suspect.
-Steve
Very informative, thanks. My code is lying here[1]. I want my
struct to accept 2d static arrays, random access ranges, and
"std.container.Array". I could achieve it with its present form,
and I will probably slightly modify it based on your comments.
[1]:
https://github.com/aferust/earcut-d/blob/master/source/earcutd.d#L34
