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

constexpr V base() const& requires std::copy_constructible<V>;	(1)	(since C++20)
constexpr V base() &&;	(2)	(since C++20)

Returns a copy of the underlying view.

1) Copy constructs the result from the underlying view.

2) Move constructs the result from the underlying view.

Parameters

(none).

Return value

A copy of the underlying view.

Example

#include <array>
#include <ranges>
#include <iostream>
#include <algorithm>
 
void print(auto first, auto last) {
    for (; first != last; ++first)
        std::cout << *first << ' ';
    std::cout << '\n';
}
 
int main()
{
    std::array data{ 1, 2, 3, 4, 5 };
    print(data.cbegin(), data.cend());
 
    auto func = [](int x) { return x < 3; };
    auto view = std::ranges::drop_while_view{ data, func };
    print(view.begin(), view.end());
 
    auto base = view.base(); // `base` refers to the `data`
    std::ranges::reverse(base); //< changes `data` indirectly
    print(data.cbegin(), data.cend());
}

Output:

1 2 3 4 5
3 4 5
5 4 3 2 1

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