On 2013-11-11 10:23, simendsjo wrote:
On Monday, 11 November 2013 at 09:02:01 UTC, bearophile wrote:
auto person = persons.filter!(e => e.name == "John");
The problem here is that a library need to know that it has to create
SELECT * FROM persons WHERE name = 'John';
and not
SELECT * FROM persons;
and filter it locally.
So it needs a way to inspect the body of the delegate and extract "name"
"==" and "John".
This particular example would work. "e" would be a proxy which
implements opDispatch which returns another proxy which overloads
opEquals. The problem is that != and all the comparison operators won't
work. See my reply to bearophile:
http://forum.dlang.org/thread/[email protected]?page=3#post-l5q892:242kpf:241:40digitalmars.com
--
/Jacob Carlborg
