This is probably very simple, but I cannot find out how to do it..

I have several variables, and want to construct a tuple for the values.
int a;
string b;
ToTuple!(a, b) should create Tuple!(int, "a", string, "b")

template ToTuple(Variables...) {
  ?
}

On 31-05-2012 16:53, simendsjo wrote:
> This is probably very simple, but I cannot find out how to do it..
>
> I have several variables, and want to construct a tuple for the values.
> int a;
> string b;
> ToTuple!(a, b) should create Tuple!(int, "a", string, "b")
>
> template ToTuple(Variables...) {
> ?
> }

Just look at std.typecons.Tuple.

-- 
Alex Rønne Petersen
alex@lycus.org
http://lycus.org

On Thu, 31 May 2012 16:54:53 +0200, Alex Rønne Petersen <alex@lycus.org> wrote:

> On 31-05-2012 16:53, simendsjo wrote:
>> This is probably very simple, but I cannot find out how to do it..
>>
>> I have several variables, and want to construct a tuple for the values.
>> int a;
>> string b;
>> ToTuple!(a, b) should create Tuple!(int, "a", string, "b")
>>
>> template ToTuple(Variables...) {
>> ?
>> }
>
> Just look at std.typecons.Tuple.
>


I did, but I don't know how to lower it so I don't get tuples of tuples: Tuple!(int,"a"c,Tuple!(string,"b"c))

simendsjo:

> int a;
> string b;
> ToTuple!(a, b) should create Tuple!(int, "a", string, "b")
>
> template ToTuple(Variables...) {
>   ?
> }

ToTuple will have a hard time inventing the names for those
fields...

Bye,
bearophile

On Thu, 31 May 2012 18:42:20 +0200, bearophile <bearophileHUGS@lycos.com> wrote:

> simendsjo:
>
>> int a;
>> string b;
>> ToTuple!(a, b) should create Tuple!(int, "a", string, "b")
>>
>> template ToTuple(Variables...) {
>>   ?
>> }
>
> ToTuple will have a hard time inventing the names for those
> fields...
>
> Bye,
> bearophile


Not sure I understand what you mean. Using Variables[i].stringof in a template gives the original name.

On Thu, May 31, 2012 at 7:14 PM, simendsjo <simendsjo@gmail.com> wrote:
> On Thu, 31 May 2012 18:42:20 +0200, bearophile <bearophileHUGS@lycos.com> wrote:
>
>> simendsjo:
>>
>>> int a;
>>> string b;
>>> ToTuple!(a, b) should create Tuple!(int, "a", string, "b")
>>>
>>> template ToTuple(Variables...) {
>>>  ?
>>> }

Is the following what you're looking for?


import std.stdio;
import std.typecons;
import std.typetuple;

template TypeAndName(Variables...)
{
    static if (Variables.length == 0)
        alias TypeTuple!() TypeAndName;
    else
        alias TypeTuple!(typeof(Variables[0]), Variables[0].stringof,
TypeAndName!(Variables[1..$])) TypeAndName;
}

Tuple!(TypeAndName!(Variables)) toTuple(Variables...)() @property
{
    return Tuple!(TypeAndName!(Variables))(Variables);
}

void main()
{
    int i = 1;
    double d = 3.14;
    auto t = toTuple!(i,d);
    writeln(t.i);
    writeln(t.d);
}