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digitalmars.D.learn - clear AAs

reply Mandel <mandel mailinator.com> writes:
Hi,

I have a simple question, how can I remove all elements of an associative array
in an elegant way?
The length property of an AA is read only.
Doing a foreach/remove seems a bit to much text; most containers provide some
clear method.
Apr 17 2007
parent reply Bradley Smith <digitalmars-com baysmith.com> writes:
Mandel wrote:

 Hi,
 
 I have a simple question, how can I remove all elements of an associative array
 in an elegant way?
 The length property of an AA is read only.
 Doing a foreach/remove seems a bit to much text; most containers provide some
clear method.



import std.stdio;

void main() {

   bool[char[]] aa;
   aa["abc"] = true;
   aa["def"] = false;
   writefln(aa);

   aa = aa.init;
   writefln(aa);
}
Apr 17 2007
next sibling parent reply Daniel Keep <daniel.keep.lists gmail.com> writes:
Bradley Smith wrote:

 Mandel wrote:

 Hi,

 I have a simple question, how can I remove all elements of an
 associative array
 in an elegant way?
 The length property of an AA is read only.
 Doing a foreach/remove seems a bit to much text; most containers
 provide some clear method.


 
 
 import std.stdio;
 
 void main() {
 
   bool[char[]] aa;
   aa["abc"] = true;
   aa["def"] = false;
   writefln(aa);
 
   aa = aa.init;
   writefln(aa);
 }


... that's so simple; why didn't I think of that before?!

Thanks for that! :)

	-- Daniel

-- 
int getRandomNumber()
{
    return 4; // chosen by fair dice roll.
              // guaranteed to be random.
}

http://xkcd.com/

v2sw5+8Yhw5ln4+5pr6OFPma8u6+7Lw4Tm6+7l6+7D
i28a2Xs3MSr2e4/6+7t4TNSMb6HTOp5en5g6RAHCP  http://hackerkey.com/
Apr 18 2007
parent reply Max Samukha <samukha voliacable.com> writes:
On Wed, 18 Apr 2007 18:01:00 +1000, Daniel Keep
<daniel.keep.lists gmail.com> wrote:


Bradley Smith wrote:

 Mandel wrote:

 Hi,

 I have a simple question, how can I remove all elements of an
 associative array
 in an elegant way?
 The length property of an AA is read only.
 Doing a foreach/remove seems a bit to much text; most containers
 provide some clear method.


 
 
 import std.stdio;
 
 void main() {
 
   bool[char[]] aa;
   aa["abc"] = true;
   aa["def"] = false;
   writefln(aa);
 
   aa = aa.init;
   writefln(aa);
 }


... that's so simple; why didn't I think of that before?!

Thanks for that! :)

	-- Daniel


Or aa = null (aa.init == null)
Apr 18 2007
parent reply BCS <BCS pathlink.com> writes:
Max Samukha wrote:

 Daniel Keep wrote:
 

Bradley Smith wrote:


import std.stdio;

void main() {

  bool[char[]] aa;
  aa["abc"] = true;
  aa["def"] = false;
  writefln(aa);

  aa = aa.init;
  writefln(aa);
}


... that's so simple; why didn't I think of that before?!

Thanks for that! :)

	-- Daniel


 
 
 Or aa = null (aa.init == null)


can you then fill it up again?
Apr 18 2007
parent Max Samukha <samukha voliacable.com> writes:
On Wed, 18 Apr 2007 09:18:50 -0700, BCS <BCS pathlink.com> wrote:


Max Samukha wrote:

 Daniel Keep wrote:
 

Bradley Smith wrote:


import std.stdio;

void main() {

  bool[char[]] aa;
  aa["abc"] = true;
  aa["def"] = false;
  writefln(aa);

  aa = aa.init;
  writefln(aa);
}


... that's so simple; why didn't I think of that before?!

Thanks for that! :)

	-- Daniel


 
 
 Or aa = null (aa.init == null)


can you then fill it up again?


Yes
Apr 18 2007
prev sibling parent Aarti_pl <aarti interia.pl> writes:
Bradley Smith napisał(a):

 Mandel wrote:

 Hi,

 I have a simple question, how can I remove all elements of an 
 associative array
 in an elegant way?
 The length property of an AA is read only.
 Doing a foreach/remove seems a bit to much text; most containers 
 provide some clear method.


 
 
 import std.stdio;
 
 void main() {
 
   bool[char[]] aa;
   aa["abc"] = true;
   aa["def"] = false;
   writefln(aa);
 
   aa = aa.init;
   writefln(aa);
 }
 



You can also do it in following way:

aa = null;

BR
Marcin Kuszczak
aarti_pl
Apr 18 2007