std::move_iterator<Iter>::move_iterator - cppreference.com

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move_iterator();	(1)	(constexpr since C++17)
explicit move_iterator( iterator_type x );	(2)	(constexpr since C++17)
template< class U > move_iterator( const move_iterator<U>& other );	(3)	(constexpr since C++17)

Constructs a new move_iterator.

1) Default constructor. The underlying iterator is value-initialized.

2) The underlying iterator is initialized with x(until C++20)std::move(x)(since C++20).

3) The underlying iterator is initialized with that of other.

If `U` is not convertible to `Iter`, the program is ill-formed.	(until C++20)
This overload participates in overload resolution only if `std::is_same_v<U, Iter>` is `false` and `std::convertible_to<const U&, Iter>` is modeled.	(since C++20)

x	-	iterator to adapt
other	-	iterator adaptor to copy

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 3435	C++20	overload (3) was not constrained	constrained