On Tuesday, 7 February 2017 at 20:28:30 UTC, Ali Çehreli wrote:
You forgot to call that most important function. ;)
Hah of course. I assumed the name would give it some special
meaning, like postblit.
1) I don't understand the first assert there, which does not
pass for me, so I commented it out.
The intention is to check that (_payload.ptr - first) is larger
than 0.
2) May bad: init() is not a good name for a struct member, so
it should be renamed:
void initialize() {
// assert( first < cast(size_t)_payload.ptr);
// Address space underrun.
assert(-first < size_t.max - cast(size_t)_payload.ptr);
// Address space overrun.
this._ptr = _payload.ptr - first;
}
3) Instead of having to remember to call it, let's introduce a
function that does it for us:
auto makeStaticArray(T, ptrdiff_t first, ptrdiff_t last)() {
auto s = StaticArray!(T, first, last)();
s.initialize();
return s;
}
OK good.
unittest {
// StaticArray!(int, -10, 10) arr;
auto arr = makeStaticArray!(int, -10, 10);
> foreach (i, ref e; arr)
> e = i;
Unrelated: That line passes because you're building 32-bits.
Here is the error I got:
Error: cannot implicitly convert expression (i) of type long
to int
You can cast it:
e = cast(int)i;
or by
import std.conv : to;
e = i.to!int;
Thanks a lot for your illustrative answers, including the next
one!
Bastiaan.
