Re: hash_set: how to handle collisions?

James Kanze <>
Sat, 12 Jul 2008 12:28:53 -0700 (PDT)
On Jul 12, 7:47 pm, Markus Dehmann <> wrote:

On Jul 11, 5:54 am, James Kanze <> wrote:

On Jul 11, 3:20 am, Markus Dehmann <> wrote:

  for(int i=0; i<repeat; ++i){
    MyContainer* h = new MyContainer();
    for(int j=0; j<size; ++j){
      h->add(getRand(0, 1000));
  for(int i=0; i<repeat; ++i){
    MyContainer* h = new MyContainer();
    for(int j=0; j<size; ++j){
      h->add(getRand(2000, 3000));
    MyMap::const_iterator found = myMap.find(h);
    assert(found == myMap.end()); // aborts!

I'm not sure I understand. You create a random object, and
assert that it is in the container. Why should you expect it to
be in the container?

No, I define an object that is guaranteed *not* to be in the
container and ask the container to find it. The assertion says
that the object should not be found.

Yes, I misread this part. Except that given the way you defined
equality, you didn't guarantee that an equal object wouldn't be
in the container.

James Kanze (GABI Software)
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