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

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< cpp‎ | ranges‎ | take while view

take_while_view() requires std::default_initializable <V> && std::default_initializable <Pred> = default; | (1) | (since C++20)
constexpr explicit 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 `base_` from base and the predicate `pred_` from pred.

### Parameters

base | - | underlying view
fun | - | predicate

### Example

| This section is incomplete Reason: no example

### Defect reports

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

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 3714 (P2711R1) | C++20 | the multi-parameter constructor was not explicit | made explicit
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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