• Jordan Wilson (15/15) Jun 30 2016 Hello,
• Nicholas Wilson (2/17) Jun 30 2016 static map (and map in general) is a 1:1 correspondence, so yes.
• Meta (3/18) Jun 30 2016 It's an implementation detail but I wouldn't expect the order to

Jordan Wilson <wilsonjord gmail.com> writes:

Hello,

For tuples, does the fieldNames property have a 1-1 
correspondence with the Types property?

It appears that way in my testing:

alias MyData = Tuple!(string,"a",int,"b");
foreach (i, type; MyData.Types){
     writeln (MyData.fieldNames[i]," ",type.stringof);
     // a string
     // b int
}

But I can't figure out for sure from the documentation:

alias fieldNames = staticMap!(extractName, fieldSpecs);
alias Types = staticMap!(extractType, fieldSpecs);

Thanks,

Jordan

Nicholas Wilson <iamthewilsonator hotmail.com> writes:

On Thursday, 30 June 2016 at 21:53:42 UTC, Jordan Wilson wrote:
 Hello,

 For tuples, does the fieldNames property have a 1-1 
 correspondence with the Types property?

 It appears that way in my testing:

 alias MyData = Tuple!(string,"a",int,"b");
 foreach (i, type; MyData.Types){
     writeln (MyData.fieldNames[i]," ",type.stringof);
     // a string
     // b int
 }

 But I can't figure out for sure from the documentation:

 alias fieldNames = staticMap!(extractName, fieldSpecs);
 alias Types = staticMap!(extractType, fieldSpecs);

 Thanks,

 Jordan

static map (and map in general) is a 1:1 correspondence, so yes.

Meta <jared771 gmail.com> writes:

On Thursday, 30 June 2016 at 21:53:42 UTC, Jordan Wilson wrote:
 Hello,

 For tuples, does the fieldNames property have a 1-1 
 correspondence with the Types property?

 It appears that way in my testing:

 alias MyData = Tuple!(string,"a",int,"b");
 foreach (i, type; MyData.Types){
     writeln (MyData.fieldNames[i]," ",type.stringof);
     // a string
     // b int
 }

 But I can't figure out for sure from the documentation:

 alias fieldNames = staticMap!(extractName, fieldSpecs);
 alias Types = staticMap!(extractType, fieldSpecs);

 Thanks,

 Jordan

It's an implementation detail but I wouldn't expect the order to 
ever change.