Question about non-specific templates when using nested templates

Question

Why test<std::vector<int> >(); is wrong?

How to comprehend the usage of typename in template <template <typename T, typename AllocT > typename ContainerT>?

Here is the code snippet:

template <template <typename T, typename AllocT > typename ContainerT>
test()
{
    ContainerT<int, my::Allocator<int> > container.
}

int main()
{
     test<std::vector>();
     test<std::list>();
     test<std::set>();
}

Does this answer your question? [Where and why do I have to put the "template" and "typename" keywords?](https://stackoverflow.com/questions/610245/where-and-why-do-i-have-to-put-the-template-and-typename-keywords) — Ulrich Eckhardt, Dec 24 '20 at 09:52
Look here https://en.cppreference.com/w/cpp/language/template_parameters at template template parameter there are few examples. — Tony, Dec 24 '20 at 09:52

score 1 · Answer 1 · answered Dec 24 '20 at 09:51

1

In this context, the typename keyword simply means that the template parameter is a type parameter.

answered Dec 24 '20 at 09:51

eerorika

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You mean `ContainerT` is equivalent to `template – John Dec 24 '20 at 09:54

Question about non-specific templates when using nested templates

1 Answers1