My thoughts & experiences with D so far, as a novice D coder

[1100110]

On 03/27/2013 12:08 PM, Steven Schveighoffer wrote:
> On Wed, 27 Mar 2013 11:34:19 -0400, Vidar Wahlberg
> <vidar.wahlberg at gmail.com> wrote:
>
>> - When casting a value to an enum, there's no checking that the value
>> actually is a valid enum value. Don't think I ever found a solution on
>> how to check whether the value after casting is a valid enum value, it
>> hasn't been a pressing issue.
>
> Typically, one uses std.conv.to to safely convert one value into
> another. Cast should be avoided unless absolutely necessary.
>
> I just tested it, it works on enum *strings*, but not enum *values*
>
> For example:
>
> import std.conv;
>
> enum X {
> i, j, k
> }
>
> void main()
> {
> X x = to!X("i"); // works!
> x = to!X(1); // fails!
> }


> I think to should be able to do this, but I'm not a good enough guru
> with templates and compile-time type info to know if it's possible.
> Anyone know if this is possible? If so, I think it should be added.
>
> -Steve

It also works on values....


enum A
{
     B,
     C,
     D,
}
int w;

import std.conv;
import std.stdio;

void main()
{
    auto t = w.to!A.B;

    writeln(t);
}