get from tuple by type

anonymous via Digitalmars-d-learn digitalmars-d-learn at puremagic.com
Sun Mar 15 16:20:21 PDT 2015


On Sunday, 15 March 2015 at 23:13:58 UTC, Charles Cooper wrote:
> And yes, I could use names. But then you are subject to name 
> clashes and using strings instead of types as member 
> identifiers is more prone to error anyways. Ever gotten this 
> wrong before --
> void CRITICAL_TO_GET_THIS_RIGHT(uint cents, uint dollars);
> ....
> alias params_t = Tuple!(uint, "dollars", uint, "cents");
> ....
> params_t params;
> params.dollars = 0;
> params.cents = 99;
> CRITICAL_TO_GET_THIS_RIGHT(params.expand);
> // compilation succeeds, bank fails.

How would GetByType help here? Both members are uint, so you 
can't distinguish them by type. And if you gave them distinct 
types, the bad example here wouldn't compile anymore either.


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