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Home/ Questions/Q 1039621
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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T15:07:23+00:00 2026-05-16T15:07:23+00:00

Is it possible to have a vector without specializing it? My problem is: I

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Is it possible to have a vector without specializing it?

My problem is: I have an abstract class N4GestureRecognizer
and a couple of subclasses of it.
So in a Controller class I want to have a vector<N4GestureRecognizer> recognizers_ but since it is abstract I cannot.
How can I store this recognizers in a vector or collection or list or whatever is loop-able in standard c++?

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  1. Editorial Team
    Editorial Team
    2026-05-16T15:07:23+00:00Added an answer on May 16, 2026 at 3:07 pm

    Store them as pointers. Either pure pointers or some smart pointer class.

    EXTRA
    Actually, pointers are the only way even if the class is not abstracts, but is subclassed and child classes are intended to be used in the vector. Why: std::vector allocates sizeof(T) bytes for each element, but sizeof(derivedFromT) could be bigger than sizeof(T). You will be able to push a child object into the vector, but it can cause unpredictable issues at run time.

    Managing vectors of pointers is a pain, of course, but as far as I remember, boost contains some smart pointers to simplify the task.

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