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Asked: 2026-05-15T08:03:44+00:00

It is easy given a container to get the associated iterators, example: std::vector<double>::iterator i;

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It is easy given a container to get the associated iterators, example:

std::vector<double>::iterator i; //An iterator to a std::vector<double>

I was wondering if it is possible, given an iterator type, to deduce the type of the “corresponding container” (here I am assuming that for each container there is one and only one (non-const) iterator).

More precisely, I would like a template metafunction that works with all STL containers (without having to specialize it manually for each single container) such that, for example:

ContainerOf< std::vector<double>::iterator >::type

evaluates to 

std::vector<double>

Is it possible?
If not, why?

Thank you in advance for any help!

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1 Answer

  1. Editorial Team

    I don’t think this would be possible. On some STL libraries you actually have a vector iterator as a pointer type, i.e. std::vector<T>::iterator is a T* so I can’t think of any way you could get back to the container type from that.

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