On 27.11.2015 15:05, drug wrote:
I need to get names of enum members, is it possible? EnumMembers returns
the members itself, i.e.
```
enum Sqrts : real
{
one = 1,
two = 1.41421,
three = 1.73205,
}
pragma(msg, [EnumMembers!Sqrts]);
```
returns
[1.00000L, 1.41421L, 1.73205L]
but I need
[ "Sqrts.one", "Sqrts.two", "Sqrts.three" ] or [ "one", "two", "three" ]
You have a variety of options with subtle differences:
----
module test;
import std.algorithm: map;
import std.array: array;
import std.conv: to;
import std.meta: staticMap;
import std.range: only;
import std.traits: EnumMembers, fullyQualifiedName;
enum Sqrts : real
{
one = 1,
two = 1.41421,
three = 1.73205,
}
pragma(msg, only(EnumMembers!Sqrts).map!(to!string).array);
/* [['o', 'n', 'e'], ['t', 'w', 'o'], ['t', 'h', 'r', 'e', 'e']] */
enum toString(alias thing) = thing.to!string;
pragma(msg, staticMap!(toString, EnumMembers!Sqrts));
/* tuple(['o', 'n', 'e'], ['t', 'w', 'o'], ['t', 'h', 'r', 'e',
'e']) */
pragma(msg, staticMap!(fullyQualifiedName, EnumMembers!Sqrts));
/* tuple("test.Sqrts.one", "test.Sqrts.two", "test.Sqrts.three") */
enum stringOf(alias thing) = thing.stringof;
pragma(msg, staticMap!(stringOf, EnumMembers!Sqrts));
/* tuple("one", "two", "three") */
----
std.conv.to is the first address for conversions between types. I'd say
use that unless you have a reason not to.
If you're doing code generation, or otherwise need the fully qualified
name, use std.traits.fullyQualifiedName.
I'm not sure if there would ever be a reason to use .stringof over the
other ones, other than some quick debug printing.
There are probably more ways I didn't think of.
