Re: UFCS doesn't work in some cases

2014-09-10 Thread Danyal Zia via Digitalmars-d-learn 
On Tuesday, 9 September 2014 at 18:46:31 UTC, ketmar via 
Digitalmars-d-learn wrote:
UFCS is not working for nested functions. this is not a bug, it 
was

designed this way. the same for 'with', i believe.
Apparently it is a bug that UFCS doesn't work with 'with' 
statement.

https://issues.dlang.org/show_bug.cgi?id=10349

there is rationale. see http://dlang.org/function.html, UFCS 
section.

Must have missed it before, thanks.

Re: UFCS doesn't work in some cases

2014-09-10 Thread ketmar via Digitalmars-d-learn 
On Wed, 10 Sep 2014 13:58:18 +
Danyal Zia via Digitalmars-d-learn digitalmars-d-learn@puremagic.com
wrote:

 Apparently it is a bug that UFCS doesn't work with 'with' 
 statement.
my fault, i thought that it shouldn't. i'm still not Guru. too bad,
will work. ;-)


signature.asc
Description: PGP signature

UFCS doesn't work in some cases

2014-09-09 Thread Danyal Zia via Digitalmars-d-learn 

Hi,

I don't know if this has been mentioned before, but I found two 
strange cases where UFCS doesn't work.


Case # 1: When the functions for UFCS are defined inside main 
scope


class Rect {
int x = 20;
int y = 20;
}

void main() {
import std.stdio : writeln;

int area(Rect rect) {
return rect.x * rect.y;
}

auto rect = new Rect;

rect.area.writeln; // Error: no property 'area' for type 
'main.Rect'

}

Put that 'area' definition outside the main body and it works 
fine.


Case # 2: When using UFCS in 'with' scope

class Rect {
int x = 20;
int y = 20;
}

int area(Rect rect) {
return rect.x * rect.y;
}

void main() {
import std.stdio : writeln;

auto rect = new Rect;

with(rect) {
		area.writeln; // Error: function main.area (Rect rect) is not 
callable using argument types ()

}
}

As far as I know, UFCS are designed to make it easy to extend the 
class for specific applications, however, without the ability to 
use UFCS for those cases, it limits its usefulness. Are these 
oversights/bugs? Or is their any rationale behind the decision to 
not implement UFCS for them?


Danyal

Re: UFCS doesn't work in some cases

2014-09-09 Thread ketmar via Digitalmars-d-learn 
On Tue, 09 Sep 2014 17:58:14 +
Danyal Zia via Digitalmars-d-learn digitalmars-d-learn@puremagic.com
wrote:

 Case # 1: When the functions for UFCS are defined inside main 
 scope
UFCS is not working for nested functions. this is not a bug, it was
designed this way. the same for 'with', i believe.

 oversights/bugs? Or is their any rationale behind the decision to 
 not implement UFCS for them?
there is rationale. see http://dlang.org/function.html, UFCS section.


signature.asc
Description: PGP signature

Re: UFCS doesn't work in some cases

2014-09-09 Thread Mathias LANG via Digitalmars-d-learn 

On Tuesday, 9 September 2014 at 17:58:16 UTC, Danyal Zia wrote:
As far as I know, UFCS are designed to make it easy to extend 
the class for specific applications, however, without the 
ability to use UFCS for those cases, it limits its usefulness. 
Are these oversights/bugs? Or is their any rationale behind the 
decision to not implement UFCS for them?


Danyal



The reason why local symbols are not considered by UFCS, is to 
avoid unexpected name conflicts.


Stated at the very bottom of: http://dlang.org/function.html