[Issue 3189] `std.conv.to` : check for a custom `to` method in classes/structs

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3189


Andrei Alexandrescu <andrei at metalanguage.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED




--- Comment #1 from Andrei Alexandrescu <andrei at metalanguage.com>  2009-08-28 08:28:09 PDT ---
Ok. I implemented this:

/**
Object-_to-non-object conversions look for a method "to" of the source
object.

Example:
----
class Date
{
    T to(T)() if(is(T == long))
    {
        return timestamp;
    }
    ...
}

unittest
{
    auto d = new Date;
    auto ts = to!long(d); // same as d.to!long()
}
----
 */
T to(T, S)(S value) if (is(S : Object) && !is(T : Object) && !isSomeString!T
        && is(typeof(S.init.to!(T)()) : T))
{
    return value.to!T();
}

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