On Friday, 3 April 2015 at 17:51:00 UTC, Andrei Alexandrescu
wrote:
On 4/3/15 4:04 AM, Dennis Ritchie wrote:
On Thursday, 2 April 2015 at 22:44:56 UTC, Andrei Alexandrescu
wrote:
It's the end of Q1. Walter and I reviewed our vision
document. We're
staying the course with one important addition: switching to
ddmd,
hopefully with 2.068.
http://wiki.dlang.org/Vision/2015H1
Andrei
Are there any plans for the creation of a powerful AST-macro
system in D?
http://wiki.dlang.org/DIP50
Not for the time being. -- Andrei
Thanks. I hope that in the near future will be a powerful D
macrosystem. If you ever start to create a macro system in D,
then I suggest you explore approaches Lisp family of languages,
because they have a very powerful macro-framework that allows
modifying the language to suit your needs. In the family of Lisp
contains a lot of powerful features that can once and for all to
eclipse C++. It would be very nice if in the future you add these
features in D. Sorry if I did something wrong said.
For Example,
D mixin's:
-----
import std.stdio;
import std.algorithm;
string print(string s)
{
return `writeln(` ~ s ~ `);`;
}
void main()
{
auto a = 3;
auto arr = [1, 2, 3, 4, 5];
mixin(print(`5`)); // prints 5
mixin(print(`'c'`)); // prints c
mixin(print(`"str"`)); // prints str
mixin(print(`arr`)); // prints [1, 2, 3, 4, 5]
mixin(print(`arr.map!(t => ++t)`)); // prints [2, 3, 4, 5, 6]
mixin(print(`a`)); // prints 3
}
-----
Mixin, created by a powerful macro system Common Lisp:
-----
(defmacro mixin (f) (read-from-string (eval f)))
(defun pr (s)
(format nil "(print ~A)" s))
(defun main (&aux (a 3) (arr '(1 2 3 4 5)))
(mixin (pr "5"))
(mixin (pr "#\\c"))
(mixin (pr "\"str\""))
(mixin (pr "arr"))
(mixin (pr "(mapcar (lambda (x) (1+ x)) arr)"))
(mixin (pr "a"))
(values))
-----
CL-USER> (main)
5
#\c
"str"
(1 2 3 4 5)
(2 3 4 5 6)
3 ; No value
