[Issue 12315] std.array.array at compile-time too

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12315



--- Comment #6 from bearophile_hugs at eml.cc 2014-03-09 07:11:11 PDT ---
(In reply to comment #5)

> There are also assumeSafeAppend, reserve/capacity, and so on. I don't know if
> they speedup the code at compile-time too.

It seems code like this doesn't yet work:

import std.traits: ForeachType;
import std.range: hasLength;
ForeachType!R[] myArray(R)(R r) {
    if (__ctfe) {
        typeof(return) result;
        static if (hasLength!R)
            result.reserve = r.length;
        foreach (item; r)
            result ~= r;
        return result;
    } else {
        // ...
        assert(0);
    }
}
struct Foo1 {
    int i;
}
struct Foo2 {
    immutable int i;
}
void main() {
    enum r1 = [Foo1(1)].myArray; // OK
    enum r2 = [Foo2(1)].myArray; // OK
}

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