Re: Joining AliasSeq/TypeTuple s
On Tuesday, 29 March 2016 at 10:06:43 UTC, Adrian Matoga wrote:
(...)
Another version that doesn't misbehave if first and second are of
different lengths:
import std.meta : AliasSeq;
template RR(A...) {
template With(B...) {
static if (A.length == 0 || B.length == 0)
alias With = AliasSeq!(A, B); // or static assert(0) if you
require equal lengths
else
alias With = AliasSeq!(A[0], B[0], RR!(A[1 .. $]).With!(B[1 ..
$]));
}
}
struct S(A...) {} // needed to reliably compare AliasSeq's for
equality
unittest {
alias first = AliasSeq!(int, string, bool);
alias second = AliasSeq!("abc", "def", "ghi");
alias third = RR!first.With!second;
static assert(is(S!third == S!(int, "abc", string, "def", bool,
"ghi")));
alias fourth = RR!(first[0 .. 2]).With!second;
static assert(is(S!fourth == S!(int, "abc", string, "def",
"ghi")));
}
Re: Joining AliasSeq/TypeTuple s
On 03/29/2016 02:33 AM, Voitech wrote:
Hi, i want to join two or more tupples in to one, with mixing the
indexes like roundRobin but in compile time.
unittest{
import std.meta;
alias first=AliasSeq!(int, string,bool);
alias second=AliasSeq!("abc","def","ghi");
alias third=...
static assert(third==AliasSeq!(int, "abc", string, "def", bool, "ghi"));
}
Just a reminder that if you needed to concatenate, then it would be
trivial due to automatic expansion of AliasSeq elements:
alias third = AliasSeq!(first, second);
Ali
Re: Joining AliasSeq/TypeTuple s
On Tuesday, 29 March 2016 at 09:33:40 UTC, Voitech wrote:
Hi, i want to join two or more tupples in to one, with mixing
the indexes like roundRobin but in compile time.
unittest{
import std.meta;
alias first=AliasSeq!(int, string,bool);
alias second=AliasSeq!("abc","def","ghi");
alias third=...
static assert(third==AliasSeq!(int, "abc", string, "def", bool,
"ghi"));
}
How to obtain this kind of functionality ? Is there maybe some
builin template for this in phobos ? I couldn't find this.
Thank you
Voitech.
import std.meta : AliasSeq;
template RR(A...)
if (!(A.length & 1))
{
static if (A.length == 0)
alias RR = AliasSeq!();
else {
alias Left = A[0 .. $ / 2];
alias Right = A[$ / 2 .. $];
alias RR = AliasSeq!(Left[0], Right[0], RR!(Left[1 .. $],
Right[1 .. $]));
}
}
struct S(A...) {} // needed to reliably compare AliasSeq's for
equality
unittest {
alias first = AliasSeq!(int, string, bool);
alias second = AliasSeq!("abc", "def", "ghi");
alias third = RR!(first, second);
static assert(is(S!third == S!(int, "abc", string, "def", bool,
"ghi")));
}
