How can i get the value from an enum when passed to a function?

[Tobias Pankrath]

On Sunday, 19 January 2014 at 17:37:54 UTC, Gary Willoughby wrote:
> How can i get the value from an enum when passed to a function? 
> For example i have the following code:
>
> import std.stdio;
>
> enum E : string
> {
> 	one = "1",
> 	two = "2",
> }
>
> void print(E e)
> {
> 	writefln("%s", e);
> }
>
> void main(string[] args)
> {
> 	print(E.one);
> }
>
> The output is 'one'. How can i get at the value '1' instead. I 
> could change the print function to accept a string like this:
>
> void print(string e)
> {
> 	writefln("%s", e);
> }
>
> but i lose the constraint of using an enum for the values.

You'll need to cast the value, but you can guard this cast using 
std.traits.OriginalType or write a toOType function.

auto toOType(E)(E e) if(is(E == enum)) { return 
cast(OriginalType!E) e; }

I never get these is-expressions right on first try, but the idea 
should be clear.