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devel / comp.lang.c++ / Re: Help with generic algorithm/predicate

Re: Help with generic algorithm/predicate

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Subject: Re: Help with generic algorithm/predicate
From: vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvva@hotmail.com (V)
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by: V - Sat, 15 Jul 2023 01:12 UTC

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Morten Brix Pedersen kirjutas neljapäev, 3. oktoober 2002 kl 19:36:23 UTC+3:
> Hi,
> I have the following class:
> class Foo
> {
> public:
> Foo();
> bool var1;
> bool var2;
> bool var3;
> bool var4;
> };
> I then have a vector<Foo*> containing quite a lot of elements.
> Now, I want to be able to say "remove all elements which have var1 set to
> true".
> I can do this:
> bool myPredic(Foo *foo)
> {
> if (foo->var1)
> return true;
> else
> return false;
> }
>
> users.erase(remove_if(users.begin(), users.end(), myPredic), users.end());
> This works fine - however, I also need to have the possibility to do the
> same with var2, var3 and var4. But not at the same time.
> Is there any smart way I can solve this, instead of creating 4 variations of
> the myPredic predicate?
> Thanks.
> --
> - Morten.

Subject	Author
Re: Help with generic algorithm/predicate	V