d中取符号.

import std.traits;
import std.stdio;

enum Runnable;

struct SubSystem
{
    void run()
    {
    	writeln("SubSystem ran");
    }
}

struct Manager
{
    @Runnable SubSystem subsystem;

    void run()
    {
        static foreach(memberName; __traits(allMembers, Manager))
        {
            static foreach (attribute; __traits(getAttributes, __traits(getMember, Manager, memberName)))
            {
                static if (is(attribute == Runnable))
                {
                    __traits(getMember, Manager, memberName).run();
                }
            }
        }
    }
}


void main()
{
    Manager m;
    m.run();
}