U++ framework: Newbie corner » VectorMap:how to replace a Value

Home » Community » Newbie corner » VectorMap:how to replace a Value

Show: Today's Messages :: Polls :: Message Navigator
E-mail to friend

Re: VectorMap:how to replace a Value [message #37201 is a reply to message #29131]

Wed, 05 September 2012 09:26

rxantos
Messages: 73
Registered: October 2011

Member

Sorry for the thread necromancy. But both

map.Get("key")=2;
map[map.Find("key")]=3;

Gives an assertion fail when the key is not in the map.

Tried with Add but it will just add another copy instead of replacing the value.

Granted, some times one wants to keep the extra copies. But sometimes is just a waste of memory and cycles.

This, however, seems to work:

int i = map.Find("key");
if(0 > i) {
  map.Add("key",2);
} else {
  map[i] = 2;
}

Maybe a Set Function should be added to AMap

T& Set(const K& k, const T& x) {
  int i = Find(k);
  if(0 > i) {
    return Add(k,x);
  } else {
    value[i] = x;
  }
  return value[i];
}

so that the code becomes:

map.Set("key",2);

Report message to a moderator

[Message index]

		VectorMap:how to replace a Value By: 281264 on Wed, 06 October 2010 16:17
		Re: VectorMap:how to replace a Value By: cbpporter on Wed, 06 October 2010 16:45
		Re: VectorMap:how to replace a Value By: 281264 on Wed, 06 October 2010 19:05
		Re: VectorMap:how to replace a Value By: dolik.rce on Wed, 06 October 2010 19:54
		Re: VectorMap:how to replace a Value By: 281264 on Wed, 06 October 2010 20:05
		Re: VectorMap:how to replace a Value By: rxantos on Wed, 05 September 2012 09:26
		Re: VectorMap:how to replace a Value By: omari on Wed, 05 September 2012 10:02
		Re: VectorMap:how to replace a Value By: dolik.rce on Wed, 05 September 2012 10:05

Previous Topic:	Trouble with Socket
Next Topic:	Writes to freed blocks detected

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Thu Oct 08 18:15:55 GMT+2 2026

Total time taken to generate the page: 0.17318 seconds