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std::ranges::common_view<V>::base

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< cpp‎ | ranges‎ | common view
 
 
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(C++23)
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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 <iostream>
#include <ranges>
#include <string>
 
int main()
{
    std::string str { "C++20" };
    auto view = std::views::common(str);
 
    std::string copy_of_str = view.base();
    std::cout << "copy of str: [" << copy_of_str << "]\n";
    std::cout << "view.base(): [" << view.base() << "]\n";
 
    std::string move_str = std::move(view.base());
    std::cout << "moved str:   [" << move_str << "]\n";
    std::cout << "view.base(): [" << view.base() << "]\n"; // unspecified
}

Possible output:

copy of str: [C++20]
view.base(): [C++20]
moved str:   [C++20]
view.base(): []