Whats the best way to get a struct/class member type?

[simendsjo]

On Mon, 02 Apr 2012 00:04:58 +0200, Simen Kjærås <simen.kjaras at gmail.com>  
wrote:

> On Sat, 31 Mar 2012 15:20:42 +0200, simendsjo <simendsjo at gmail.com>  
> wrote:
>
>> Seems __traits doesn't have a __traits(getMemberType, T, name).
>> Now I'm doing the following:
>> T t; // instance to use in getMember
>> alias typeof( __traits(getMember, t, name) ) MemberType;
>>
>> Is this the only way to get the type of a field based on the name?
>
> I'd think so, apart from tupleof, as Jacob's already mentioned.
>
> It's easily factored out, though:
>
> template getMemberType(T, string name) if (is(typeof(__traits(getMember,  
> T, name)))) {
>      alias typeof(__traits(getMember, T, name)) getMemberType;
> }


getMember requires an instance, not a type, so it should be

template getMemberType(T, string name) if(__traits(hasMember, T, name) {
     T t;
     alias typeof(__traits(getMember, t, name)) getMemberType;
}