digitalmars.D.learn - with (auto p = new ...)

Andre (19/19) Sep 23 2014 Hi,

=?UTF-8?B?Ik5vcmRsw7Z3Ig==?= (7/9) Sep 23 2014 I presume with is limited to expressions and not statements as
Graham Fawcett (3/22) Sep 23 2014 How about:

Graham Fawcett (17/41) Sep 23 2014 Sorry, I sent that last message before I intended to.

andre (9/50) Sep 23 2014 Yes, that is also working. As far as I remember (only my tablet

Meta (6/6) Sep 23 2014 I think this is just a language oversight. It's allowed in if
=?UTF-8?B?Ik5vcmRsw7Z3Ig==?= (2/3) Sep 23 2014 Yes, it seem logical to me allow this also in with and switch.

Andre (2/2) Sep 24 2014 Enhancement 13526 filed:

ketmar via Digitalmars-d-learn (7/9) Sep 24 2014 i wrote a quickhack-patch for this ER. as it's my first patch that

kiran kumari (4/23) Sep 23 2014 http://techgurulab.com/course/java-quiz-online/
Freddy (13/32) Sep 26 2014 have you tried this?

Freddy (2/38) Sep 26 2014 opps, sorry I misread the quesion.

"Andre" <andre s-e-a-p.de> writes:

Hi,

I just wonder why "with (auto p = new ...)" is not working.
It would be some syntax sugar in this scenario:

	with (auto p = new Panel())
	{
		parent = this;
		text = "bla";
		with (auto b = new Button())
		{
			parent = p; // Here p is needed
			text = "bla2";
		}
	}

source\app.d(8): Error: expression expected, not 'auto'
source\app.d(8): Error: found 'p' when expecting ')'
source\app.d(8): Error: found '=' instead of statement
...

Kind regards
André

Sep 23 2014

=?UTF-8?B?Ik5vcmRsw7Z3Ig==?= <per.nordlow gmail.com> writes:

On Tuesday, 23 September 2014 at 15:19:59 UTC, Andre wrote:
 I just wonder why "with (auto p = new ...)" is not working.
 It would be some syntax sugar in this scenario:

I presume with is limited to expressions and not statements as 
the messages says.

However, you can use

  	if (auto p = new Panel())

instead as long as the new doesn't fail, that is you still have 
memory left :)

Sep 23 2014

"Graham Fawcett" <fawcett uwindsor.ca> writes:

How about:

     auto b - new Button(); with (b) {

On Tuesday, 23 September 2014 at 15:19:59 UTC, Andre wrote:
 Hi,

 I just wonder why "with (auto p = new ...)" is not working.
 It would be some syntax sugar in this scenario:

 	with (auto p = new Panel())
 	{
 		parent = this;
 		text = "bla";
 		with (auto b = new Button())
 		{
 			parent = p; // Here p is needed
 			text = "bla2";
 		}
 	}

 source\app.d(8): Error: expression expected, not 'auto'
 source\app.d(8): Error: found 'p' when expecting ')'
 source\app.d(8): Error: found '=' instead of statement
 ...

 Kind regards
 André

Sep 23 2014

"Graham Fawcett" <fawcett uwindsor.ca> writes:

Sorry, I sent that last message before I intended to.

How about:

      auto b = new Button(); with (b) {
        ...
      }

'b' is explicitly outside of the scope of the 'with' block, which 
may not be what you intended. But you could use more braces to 
add an extra level of scope if that's an issue:

     ...
     text = "blah";
     {
        auto b = new Button(); with (b) {
            ...
        }
     }
     // b is no longer in scope

Graham



 On Tuesday, 23 September 2014 at 15:19:59 UTC, Andre wrote:
 Hi,

 I just wonder why "with (auto p = new ...)" is not working.
 It would be some syntax sugar in this scenario:

 	with (auto p = new Panel())
 	{
 		parent = this;
 		text = "bla";
 		with (auto b = new Button())
 		{
 			parent = p; // Here p is needed
 			text = "bla2";
 		}
 	}

 source\app.d(8): Error: expression expected, not 'auto'
 source\app.d(8): Error: found 'p' when expecting ')'
 source\app.d(8): Error: found '=' instead of statement
 ...

 Kind regards
 André

Sep 23 2014

"andre" <andre s-e-a-p.de> writes:

Yes, that is also working. As far as I remember (only my tablet 
currently available) also this works:

Panel p;
with(p = new Panel ()) {}

Therefore it seems strange,the same does not work with auto.

Kind regards
André


On Tuesday, 23 September 2014 at 19:49:22 UTC, Graham Fawcett 
wrote:
 Sorry, I sent that last message before I intended to.

 How about:

      auto b = new Button(); with (b) {
        ...
      }

 'b' is explicitly outside of the scope of the 'with' block, 
 which may not be what you intended. But you could use more 
 braces to add an extra level of scope if that's an issue:

     ...
     text = "blah";
     {
        auto b = new Button(); with (b) {
            ...
        }
     }
     // b is no longer in scope

 Graham



 On Tuesday, 23 September 2014 at 15:19:59 UTC, Andre wrote:
 Hi,

 I just wonder why "with (auto p = new ...)" is not working.
 It would be some syntax sugar in this scenario:

 	with (auto p = new Panel())
 	{
 		parent = this;
 		text = "bla";
 		with (auto b = new Button())
 		{
 			parent = p; // Here p is needed
 			text = "bla2";
 		}
 	}

 source\app.d(8): Error: expression expected, not 'auto'
 source\app.d(8): Error: found 'p' when expecting ')'
 source\app.d(8): Error: found '=' instead of statement
 ...

 Kind regards
 André

Sep 23 2014

"Meta" <jared771 gmail.com> writes:

I think this is just a language oversight. It's allowed in if 
statements, and people have made a good case for allowing it for 
switch statements. It just hasn't been implemented. I made an 
attempt one evening to implement it for switch statements,  but 
I'm not at all familiar with DMD, so I put it on the back burner 
for the time being.

Sep 23 2014

=?UTF-8?B?Ik5vcmRsw7Z3Ig==?= <per.nordlow gmail.com> writes:

On Tuesday, 23 September 2014 at 20:16:29 UTC, andre wrote:
 Therefore it seems strange,the same does not work with auto.

Yes, it seem logical to me allow this also in with and switch.

Sep 23 2014

"Andre" <andre s-e-a-p.de> writes:

Enhancement 13526 filed:
https://issues.dlang.org/show_bug.cgi?id=13526

Sep 24 2014

ketmar via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:

On Wed, 24 Sep 2014 14:39:25 +0000
Andre via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:

 Enhancement 13526 filed:
 https://issues.dlang.org/show_bug.cgi?id=3D13526

i wrote a quickhack-patch for this ER. as it's my first patch that
goes outside parser it needs to be reviewed by someone who knows
compiler internals.

ah, and we need grammar fixes for it too, but it's completely out of my
scope now.

Sep 24 2014

"kiran kumari" <kiranfabzen gmail.com> writes:

aOn Tuesday, 23 September 2014 at 15:19:59 UTC, Andre wrote:
 Hi,

 I just wonder why "with (auto p = new ...)" is not working.
 It would be some syntax sugar in this scenario:

 	with (auto p = new Panel())
 	{
 		parent = this;
 		text = "bla";
 		with (auto b = new Button())
 		{
 			parent = p; // Here p is needed
 			text = "bla2";
 		}
 	}

 source\app.d(8): Error: expression expected, not 'auto'
 source\app.d(8): Error: found 'p' when expecting ')'
 source\app.d(8): Error: found '=' instead of statement
 ...

 Kind regards
 see more example

http://techgurulab.com/course/java-quiz-online/


see more example
http://techgurulab.com/course/java-quiz-online/e example

Sep 23 2014

"Freddy" <Hexagonalstar64 gmail.com> writes:

On Tuesday, 23 September 2014 at 15:19:59 UTC, Andre wrote:
 Hi,

 I just wonder why "with (auto p = new ...)" is not working.
 It would be some syntax sugar in this scenario:

 	with (auto p = new Panel())
 	{
 		parent = this;
 		text = "bla";
 		with (auto b = new Button())
 		{
 			parent = p; // Here p is needed
 			text = "bla2";
 		}
 	}

 source\app.d(8): Error: expression expected, not 'auto'
 source\app.d(8): Error: found 'p' when expecting ')'
 source\app.d(8): Error: found '=' instead of statement
 ...

 Kind regards
 André

have you tried this?
---
import std.stdio;

struct myStruct{
	int c=299792458;
}

void main(){
	with(new myStruct()){
		writeln(c);
	}
}
---

Sep 26 2014

"Freddy" <Hexagonalstar64 gmail.com> writes:

On Friday, 26 September 2014 at 19:59:56 UTC, Freddy wrote:
 On Tuesday, 23 September 2014 at 15:19:59 UTC, Andre wrote:
 Hi,

 I just wonder why "with (auto p = new ...)" is not working.
 It would be some syntax sugar in this scenario:

 	with (auto p = new Panel())
 	{
 		parent = this;
 		text = "bla";
 		with (auto b = new Button())
 		{
 			parent = p; // Here p is needed
 			text = "bla2";
 		}
 	}

 source\app.d(8): Error: expression expected, not 'auto'
 source\app.d(8): Error: found 'p' when expecting ')'
 source\app.d(8): Error: found '=' instead of statement
 ...

 Kind regards
 André

 have you tried this?
 ---
 import std.stdio;

 struct myStruct{
 	int c=299792458;
 }

 void main(){
 	with(new myStruct()){
 		writeln(c);
 	}
 }
 ---

opps, sorry I misread the quesion.

Sep 26 2014

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