== Quote from Stanislav Blinov (stanislav.bli...@gmail.com)'s article
> On 12/27/2010 06:41 PM, Hamad Mohammad wrote:
> >> If you tried to assign person2 to person1 or vice versa
> >
> > how?
> >
> I don't think I got what David meant with it either. Assigning instances
> of the same type is perfectly valid as long as you do not define some
> very peculiar opAssign.
> Andrej, on the other hand, made a perfect point.
> A typedef is deprecated in D2. typedef in D2 differs from C/C++ one.
> What typedef does (in the old, D1 way) is introducing a new, distinct
> type. Many D constructs, especially templates, can handle only certain
> types. Those, depending on conditions, may or may not include
> user-defined types.
> writeln requires that a given value is 'formattable' to string. It knows
> how to deal with numerics, strings, arrays, structs and classes. But it
> does not put out assumptions on unknown types (and typedef'd type is
> "unknown" to D's type system). There are some ways to "introduce" your
> types to certain constructs. For example, if you do
> writeln(person1) in your code, you'll get "Human" on the console - this
> is a default way writeln handles structs. But if you define a method
> "toString" for your Human struct, e.g:
> import std.conv;
> struct Human
> {
> //...
> string toString()
> {
> return text(name, ": ", age);
> }
> }
> , then writeln(person1) would output 'aaaa: 12' to the console.
> (Mind that this 'toString' idiom may change, which is the effect of
> recent discussions about this certain topic).
> Generally, if you want a "distinct" type in D2, define a struct (or a
> class if you want your type to have reference semantics). If you want a
> simple alias to existing type, use "alias" declaration (alias is an
> analog of C/C++ typedef, though the keyword itself does more than this.
> You can find out additional uses in documentaion or "The D Programming
> Language" book).
> At this point, language gurus should start throwing rotten tomatoes at
> my general location, but I tried to explain the thing in the easiest way
> I could.
thanks
