W3cubDocs

std::ranges::take_while_view<V,Pred>::take_while_view

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

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`

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/ranges/take_while_view/take_while_view