What can I use instead of the din.readf line below to be able to read any type in that generic function?

import std.cstream;

struct MyType
{}

void generic(T)()
{
    T var;
    dout.writef("Please enter a value of type %s: ", T.stringof);

    din.readf(&var);  // <-- Runtime ERROR for MyType
}

void main()
{
    generic!int();
    generic!MyType();
}

I am looking for a substitute for C++'s operator>> overloads for user types. I could of course implement a static read(Stream) function for my types, but not for the fundamental types.

Thank you,
Ali