Accessing Private Fields from Outside

[Robert Jacques]

On Tue, 17 May 2011 19:47:29 -0400, Mehrdad <wfunction at hotmail.com> wrote:

> Is there any (hacky) way of accessing a private field from outside a  
> data type? (The equivalent of reflection in managed languages.)
>
> I'm trying to write a piece of marshaling code that needs access to a  
> data type's fields, but can't access them because it's not allowed to. :(

The short answer:
T.tupleof works for anything that you have the source to, but doesn't  
support polymorphism out of the box.

The long answer (from my json library):
     static Value from(T)(T value) {
         static if(is(T == class) ) if( value is null ) return  
Value(Null.init);
	//...
         static if(is(T == struct) || is(T == class)) {
             Value[string] result;
             foreach(i,v;value.tupleof) {
                 result[value.tupleof[i].stringof["value.".length..$]]  =  
from(v);
             }
             return Value( result );
         }
         //..
     }

P.S. Are you marshaling to/from an open format or something proprietary?