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

From cppreference.com
 
 
Ranges library
Range access
Range conversions
(C++23)

Range primitives



Dangling iterator handling
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Range factories
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Helper items
(until C++23)(C++23)


 
 
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.

[edit] Parameters

(none)

[edit] Return value

A copy of the underlying view.

[edit] Example

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