• Andrey (7/9) Aug 22 2018 Hello,
• Alex (4/13) Aug 22 2018 Could you explain, how you mix a type "bool" and a value "Qwerty"
• Simen =?UTF-8?B?S2rDpnLDpXM=?= (17/26) Aug 22 2018 I believe this should be what you're looking for:

Andrey <saasecondbox yandex.ru> writes:

Hello,
Is there a template/function/mixin... in the library that I can 
use to map elements of a tuple?

 object.foo(Mapper!myMapFunction(1, bool, "Qwerty", 
 EnumedColor.Red));

where "Mapper" is this mapper and "myMapFunction" is a template 
function that I want to apply to each member in tuple.

I know that there is std.algorithm.map but as I understand it is 
suitable only for arrays (types are the same).

Alex <sascha.orlov gmail.com> writes:

On Wednesday, 22 August 2018 at 10:36:32 UTC, Andrey wrote:
 Hello,
 Is there a template/function/mixin... in the library that I can 
 use to map elements of a tuple?

 object.foo(Mapper!myMapFunction(1, bool, "Qwerty", 
 EnumedColor.Red));

 where "Mapper" is this mapper and "myMapFunction" is a template 
 function that I want to apply to each member in tuple.

 I know that there is std.algorithm.map but as I understand it 
 is suitable only for arrays (types are the same).

Could you explain, how you mix a type "bool" and a value "Qwerty" 
in a single tuple? Especially, which value do you pass to you 
function, when the template parameter becomes bool?

Simen =?UTF-8?B?S2rDpnLDpXM=?= <simen.kjaras gmail.com> writes:

On Wednesday, 22 August 2018 at 10:36:32 UTC, Andrey wrote:
 Hello,
 Is there a template/function/mixin... in the library that I can 
 use to map elements of a tuple?

 object.foo(Mapper!myMapFunction(1, bool, "Qwerty", 
 EnumedColor.Red));

 where "Mapper" is this mapper and "myMapFunction" is a template 
 function that I want to apply to each member in tuple.

 I know that there is std.algorithm.map but as I understand it 
 is suitable only for arrays (types are the same).

I believe this should be what you're looking for:

import std.typecons;

auto map(alias fn, T...)(Tuple!T arg) {
     import std.conv : text;
     import std.range : iota;
     import std.algorithm.iteration : joiner, map;

     return mixin(text("tuple(",T.length.iota.map!(i => 
text("fn(arg[",i,"])")).joiner(", "),")"));
}

unittest {
     import std.conv : to;
     auto a = tuple(1,2,"").map!(a => a.to!string);
     assert(a == tuple("1","2",""));
}

--
   Simen