www.digitalmars.com         C & C++   DMDScript  

D - Initializer lists?

reply "=?iso-8859-1?Q?Robert_M._M=FCnch?=" <robert.muench robertmuench.de> writes:
Hi, how can I write code like this:
	int a, b;
	a = b = 7;

This somehow doesn't work for me, I get an "no identifier for declarator"  
error. Robert
Feb 25 2004
next sibling parent reply Sean Kelly <sean ffwd.cx> writes:
Robert M. Münch wrote:

 Hi, how can I write code like this:
     int a, b;
     a = b = 7;
 
 This somehow doesn't work for me, I get an "no identifier for 
 declarator"  error. Robert



I don't think it's legal in D.  I just checked the "expression" 
documentation, however, and think it may need to be revised.  There's no 
provision for assignments in "AssignExpression" that I can see.  Also, 
the "statement" documentation references it as "AssignmentExpression."


Sean
Feb 25 2004
parent reply Manfred Nowak <svv1999 hotmail.com> writes:
On Wed, 25 Feb 2004 09:13:57 -0800, Sean Kelly wrote:



 I don't think it's legal in D.




There is:

	AssignExpression:
		ConditionalExpression
		ConditionalExpression = AssignExpression

So a list of ..=..= ... = ..  is legal.

So long.
Feb 25 2004
parent reply Sean Kelly <sean ffwd.cx> writes:
Manfred Nowak wrote:


 On Wed, 25 Feb 2004 09:13:57 -0800, Sean Kelly wrote:
 
 
 

I don't think it's legal in D.



 [...]
 
 There is:
 
 	AssignExpression:
 		ConditionalExpression
 		ConditionalExpression = AssignExpression
 
 So a list of ..=..= ... = ..  is legal.
 
 So long.



But ConditionalExpression is defined thus:

ConditionalExpression:
	OrOrExpression
	OrOrExpression ? Expression : ConditionalExpression

So unless I'm reading it wrong there's so provision for a standard 
lvalue.  This is why I said the documentation may need revision--it 
wasn't clear to me whether chaines assignments should be legal or not. 
Especially considering what I read somewhere else in the D documentation 
that a programmer should never rely on a particular evaluation order 
(except, I assume, for logical expression short-circuiting).


Sean
Feb 25 2004
next sibling parent reply Russ Lewis <spamhole-2001-07-16 deming-os.org> writes:
Sean Kelly wrote:

 Manfred Nowak wrote:
 

 On Wed, 25 Feb 2004 09:13:57 -0800, Sean Kelly wrote:




 I don't think it's legal in D.




 [...]

 There is:

     AssignExpression:
         ConditionalExpression
         ConditionalExpression = AssignExpression

 So a list of ..=..= ... = ..  is legal.

 So long.



 
 But ConditionalExpression is defined thus:
 
 ConditionalExpression:
     OrOrExpression
     OrOrExpression ? Expression : ConditionalExpression
 
 So unless I'm reading it wrong there's so provision for a standard 
 lvalue.  This is why I said the documentation may need revision--it 
 wasn't clear to me whether chaines assignments should be legal or not. 
 Especially considering what I read somewhere else in the D documentation 
 that a programmer should never rely on a particular evaluation order 
 (except, I assume, for logical expression short-circuiting).
 
 
 Sean



ConditionalExpression expands to OrOrExpression
OrOrExpression expands to AndAndExpression

and so on, down the line to PrimaryExpression, which expands to Identifier.

So ConditionalExpression does expand to Identifier. :)
Feb 25 2004
parent Sean Kelly <sean ffwd.cx> writes:
Russ Lewis wrote:

 ConditionalExpression expands to OrOrExpression
 OrOrExpression expands to AndAndExpression
 
 and so on, down the line to PrimaryExpression, which expands to Identifier.
 
 So ConditionalExpression does expand to Identifier. :)



Oops :)  I missed that first time around.  Thanks!


Sean
Feb 25 2004
prev sibling parent Manfred Nowak <svv1999 hotmail.com> writes:
Sean Kelly wrote:

[...]

 that a programmer should never rely on a particular evaluation order 




You are right. The evaluation order for a list of assignments ist not
defined. So it is not a chain assignment.

So long.
Feb 25 2004
prev sibling next sibling parent reply Russ Lewis <spamhole-2001-07-16 deming-os.org> writes:
Robert M. Münch wrote:

 Hi, how can I write code like this:
     int a, b;
     a = b = 7;
 
 This somehow doesn't work for me, I get an "no identifier for 
 declarator"  error. Robert



This code compiles & runs cleanly:



int main() {
         int a,b;
         a = b = 7;
         printf("%d %d\n", a,b);
         return 0;
}
Feb 25 2004
parent reply "=?iso-8859-1?Q?Robert_M._M=FCnch?=" <robert.muench robertmuench.de> writes:
On Wed, 25 Feb 2004 11:16:04 -0700, Russ Lewis  
<spamhole-2001-07-16 deming-os.org> wrote:


 This code compiles & runs cleanly:

 int main() {
          int a,b;
          a = b = 7;
          printf("%d %d\n", a,b);
          return 0;
 }




Ok, I had it on module level:

	module bla;

	uint a, b;
	a = b = 2*4;

This one didn't compile: "no identifier for declarator".

What I would like to do is:
	uint a = b = 2*4;

	<further code>

-- 
Robert M. Münch
Management & IT Freelancer
http://www.robertmuench.de
Feb 25 2004
parent "Kris" <someidiot earthlink.net> writes:
I believe you can achieve the same result (at the module level) via a static
constructor.

- Kris

"Robert M. Münch" <robert.muench robertmuench.de> wrote in message
news:opr3x69qshheztw6 news.digitalmars.com...

 On Wed, 25 Feb 2004 11:16:04 -0700, Russ Lewis
 <spamhole-2001-07-16 deming-os.org> wrote:


 This code compiles & runs cleanly:

 int main() {
          int a,b;
          a = b = 7;
          printf("%d %d\n", a,b);
          return 0;
 }




 Ok, I had it on module level:

 module bla;

 uint a, b;
 a = b = 2*4;

 This one didn't compile: "no identifier for declarator".

 What I would like to do is:
 uint a = b = 2*4;

 <further code>

 --
 Robert M. Münch
 Management & IT Freelancer
 http://www.robertmuench.de
Feb 25 2004
prev sibling parent jcc7 cox.net writes:
In article <opr3xj3st2heztw6 news.digitalmars.com>,
=?iso-8859-1?Q?Robert_M._M=FCnch?= says...

Hi, how can I write code like this:
	int a, b;
	a = b = 7;

This somehow doesn't work for me, I get an "no identifier for declarator"  
error. Robert




It works for me. Try posting a full example. The problem might be elsewhere.
JC

void main()
{
int a, b;
a = b = 7;
printf("%d\t%d\n", a, b);
}

/+
Output:
c:\dmd\bin\..\..\dm\bin\link.exe init2,,,user32+kernel32/noi;
7       7
+/
Feb 25 2004