something like "decltype(...) xxx"

[Bonita Montero]

I'd like to have a templated class with an iterator-class as a template
-parameter. And internally the class should have a vector having the
element-type the iterator "points" to.
I could write vector<decltype(*it)> when it is a iterator-instance.
But I'd like to have something like vector<decltype(*IteratorType)>.
Theoretically the compiler could deduce the type of *IteratorType
by analyzing the operator * of IteratorType. Even there's the issue
that this type would be a refernce this could work by writing
vector<decltype(remove_reference<*IteratorType>::type). But the
standard doesn't allow all this.
So is there a clever way arround this mess?

[Alf P. Steinbach]

Not so clever: `decltype` + `std::declval` + `std::remove_reference_t`.

Clever: `std::iterator_traits`.

Cheers!,

- Alf