Why is throwing of move operation is ignored for one overload of std::vector::resize()?

Question

In the C++ standard vector.capacity section, it defines two overloads for resize(). (see also https://en.cppreference.com/w/cpp/container/vector/resize)

This overload requires that the type T is MoveInsertable and DefaultInsertable:

constexpr void resize(size_type sz);

The other overload requires that the type T is CopyInsertable:

constexpr void resize(size_type sz, const T& c);

Clause 16 of the mentioned section in the standard states for the first overload that:

If an exception is thrown other than by the move constructor of a non-Cpp17CopyInsertable T there are no effects.

But for the second overload it states:

If an exception is thrown there are no effects.

Throwing of the move constructor is not mentioned in the second overload. why?

Answer 1

Throwing of the move constructor is not mentioned in the second overload. why?

Because the second overload requires the type to be CopyInsertable. Given that requirement, the case "of a non-Cpp17CopyInsertable T" doesn't exist for the second overload, so there is no need to mention that case.