Re: Phobos Members-Tuple function?

[Ali Çehreli]

On 01/19/2013 12:10 PM, F i L wrote:
> Is there a function in phobos which will return a Tuple of a Type's
> members, for use in a foreach statement?
The following program produces this output:

member update
  attribute Bind("Stage.update")
    Binding actor with pattern Stage.update
member draw
  attribute Bind("Canvas.draw")
    Binding actor with pattern Canvas.draw
member toString
member toHash
member opCmp
member opEquals
member Monitor
member factory

I had to use a mixin and had to move __traits(allMembers) into the 
foreach loop. It was necessary so that 'm' could be evaluated at compile 
time. I can kind of see why but one would expect your 'enum mbrs' to 
work as well.

import std.stdio;

interface Actor
{}

struct Bind
{
    string pattern;
}

class Ship : Actor
{
    @Bind("Stage.update") void update()
    {
        // ...
    }

    @Bind("Canvas.draw") void draw()
    {
        // ...
    }
}

class Engine
{
    static bindActors(Actor, string pattern)
    {
        writefln("    Binding actor with pattern %s", pattern);
    }
}

void main()
{
    auto ship = new Ship;
    alias T = typeof(ship);

    foreach (m; __traits(allMembers, T))
    {
        writefln("member %s", m);

        enum atrs = __traits(getAttributes, mixin(T.stringof ~ "." ~ m));
        foreach (a; atrs)
        {
            writefln("  attribute %s", a);
            if (is(typeof(a) == Bind))
                Engine.bindActors(ship, a.pattern);
        }
    }
}

Ali