std::move_iterator<Iter>::operator=

`template< class U > move_iterator& operator=( const move_iterator<U>& other );`		(until C++17)
`template< class U > constexpr move_iterator& operator=( const move_iterator<U>& other );`		(since C++17)

The underlying iterator is assigned the value of the underlying iterator of other, i.e. other.base().

The behavior is undefined if `U` is not convertible to `Iter`.	(until C++20)
This overload participates in overload resolution only if `U` is not the same type as `Iter` and `std::convertible_to<const U&, Iter>` and `std::assignable_from<Iter&, const U&>` are modeled.	(since C++20)

other

iterator adaptor to assign

*this

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	the converting assignment operator was not constrained	constrained

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