...without having to loop over the enum?

enum SomeType : string { CHEESE = "cheese", POTATO = "potato" }
string valid_value = "cheese";
string invalid_value = "pizza";

bool test( string value ){
    if( value.isConvertableToSomeType ){ // this be the magic I seek
        //do something
        return true;
    }
    return false;
}

void main(){
    writeln( test( valid_value ) ); //prints true
    writeln( test( invalid_value ) ); //prints false
}

Or would I need to foreach over the enum somehow?

On Friday, 25 September 2015 at 03:12:20 UTC, French Football wrote:
> ...without having to loop over the enum?
>     writeln( test( valid_value ) ); //prints true

Since `value` is known only at run time, some checks need to be performed at run time anyway. One way of doing it without iterating over all variants is to create a static hash table

bool[string] valid_strings;

and populate it in static constructor, then in your function you can just write

if (value in valid_strings) ...

On Friday, 25 September 2015 at 03:12:20 UTC, French Football wrote:
> ...without having to loop over the enum?
>
> enum SomeType : string { CHEESE = "cheese", POTATO = "potato" }
> string valid_value = "cheese";
> string invalid_value = "pizza";
>
> bool test( string value ){
>     if( value.isConvertableToSomeType ){ // this be the magic I seek
>         //do something
>         return true;
>     }
>     return false;
> }
>
> void main(){
>     writeln( test( valid_value ) ); //prints true
>     writeln( test( invalid_value ) ); //prints false
> }
>
> Or would I need to foreach over the enum somehow?

find + EnumMembers should do the trick
if ( (EnumMembers!SomeType).canFind(value))
{
    // ...
}

On Friday, 25 September 2015 at 03:20:24 UTC, Nicholas Wilson wrote:
> find + EnumMembers should do the trick
> if ( (EnumMembers!SomeType).canFind(value))
> {
>     // ...
> }

Should be

if (only(EnumMembers!SomeType).canFind(value))
{
    //...
}