take_while_view() requires std::default_initializable<V> &&
                           std::default_initializable<Pred> = default;
(1) (since C++20)
constexpr take_while_view( V base, Pred pred );
(2) (since C++20)

Constructs a take_while_view.

1) Default constructor. Value-initializes the underlying view and the predicate.
2) Move constructs the underlying view from base and the predicate from pred.


base - underlying view
fun - predicate


Defect reports

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

DR Applied to Behavior as published Correct behavior
P2325R3 C++20 if Pred is not default_initializable, the default constructor
constructs a take_while_view which does not contain an Pred
the take_while_view is also
not default_initializable

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