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

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< cpp‎ | ranges‎ | drop while view

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

Constructs a `drop_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.

### Parameters

base | - | underlying view
pred | - | predicate

### Example

Run this code

    #include <array>
    #include <iostream>
    #include <ranges>

    int main()
    {
        constexpr std::array data{0, -1, -2, 3, 1, 4, 1, 5};

        auto view = std::ranges::drop_while_view
        {
            data, [](int x) { return x <= 0; }
        };

        for (int x: view)
            std::cout << x << ' ';
        std::cout << '\n';
    }

Output:

    3 1 4 1 5

### 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 `drop_while_view` which does not contain an `Pred` | the `drop_while_view` is also not `default_initializable`

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