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"))); }
Joining AliasSeq/TypeTuple s
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.