ct_delegate.d

interface ICallable
{
    void opCall() const;
}

auto makeDelegate(alias fun, Args...)(auto ref Args args)
{
    return new class(args) ICallable
    {
        Args m_args;
		this(Args p_args) { m_args = p_args; }
        void opCall() const { fun(m_args); }
    };
}

alias Action = void delegate();

Action createDelegate(string s)
{
    import std.stdio;
    return &makeDelegate!((string str) => writeln(str))(s).opCall;
}

struct A
{
    Action[] dg;
}

A create()
{
    A a;
    a.dg ~= createDelegate("hello");
    a.dg ~= createDelegate("buy");
    return a;
}

void main()
{
    enum a = create();
    foreach(dg; a.dg)
        dg();
}