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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../ranges/as_rvalue_view.html below:

std::ranges::views::as_rvalue, std::ranges::as_rvalue_view - cppreference.com

1)

A range adaptor that represents a view of underlying

view

whose elements are rvalues.

[edit] Data members Member Description V base_ (private) the underlying view
(exposition-only member object*) [edit] Member functions constructs an as_rvalue_view
(public member function) returns the underlying view V
(public member function) returns the beginning iterator of the as_rvalue_view
(public member function) returns the end iterator of the as_rvalue_view
(public member function) returns the size of the view if it is bounded
(public member function) returns the approximate size of the underlying approximately_sized_range
(public member function) Inherited from std::ranges::view_interface returns whether the derived view is empty, provided only if it satisfies sized_range or forward_range
(public member function of std::ranges::view_interface<D>) [edit] returns a constant iterator to the beginning of the range
(public member function of std::ranges::view_interface<D>) [edit] returns a sentinel for the constant iterator of the range
(public member function of std::ranges::view_interface<D>) [edit] returns whether the derived view is not empty, provided only if ranges::empty is applicable to it
(public member function of std::ranges::view_interface<D>) [edit] returns the first element in the derived view, provided if it satisfies forward_range
(public member function of std::ranges::view_interface<D>) [edit] returns the last element in the derived view, provided only if it satisfies bidirectional_range and common_range
(public member function of std::ranges::view_interface<D>) [edit] returns the n^th element in the derived view, provided only if it satisfies random_access_range
(public member function of std::ranges::view_interface<D>) [edit] std::ranges::as_rvalue_view::as_rvalue_view (1) (since C++23)

constexpr explicit as_rvalue_view( V base );

(2) (since C++23) 1)

Value-initializes

base_

via its default member initializer (

= V()

2)

Initializes

base_

with

std::move(base)

Parameters std::ranges::as_rvalue_view::base (1) (since C++23)

constexpr V base() &&;

(2) (since C++23)

Returns the underlying view.

1)

Copy-constructs the result from the underlying view. Equivalent to

return base_ ;

2)

Move-constructs the result from the underlying view. Equivalent to

return std::move(base_ );

std::ranges::as_rvalue_view::size

Returns the size of the view if the view is bounded. Equivalent to return ranges::size(base_ );.

std::ranges::as_rvalue_view::reserve_hint

constexpr auto reserve_hint() requires ranges::approximately_sized_range<V>;

(1) (since C++26)

constexpr auto reserve_hint() const requires ranges::approximately_sized_range<const V>;

(2) (since C++26)

Returns ranges::reserve_hint(base_ ).

[edit] Deduction guides template< class R > as_rvalue_view( R&& ) -> as_rvalue_view<views::all_t<R>>; (since C++23) [edit] Helper templates

This specialization of ranges::enable_borrowed_range makes as_rvalue_view satisfy borrowed_range when the underlying view satisfies it.

[edit] Notes [edit] Example

#include <algorithm>
#include <iostream>
#include <ranges>
#include <string>
#include <vector>
 
int main()
{
    std::vector<std::string> words =
        {"Quick", "red", "\N{FOX FACE}", "jumped", "over", "a", "pterodactyl"};
    std::vector<std::string> new_words;
 
    std::ranges::copy(
        words | std::views::as_rvalue,
        std::back_inserter(new_words)); // move string from words into new_words
 
    auto quoted = std::views::transform([](auto&& s) { return "â" + s + "â"; });
 
    std::cout << "Old words: ";
    for (auto&& word : words | std::views::as_rvalue | quoted)
        std::cout << word << ' ';
 
    std::cout << "\nNew words: ";
    for (auto&& word : new_words | std::views::as_rvalue | quoted)
        std::cout << word << ' ';
}

Possible output:

Old words: ââ ââ ââ ââ ââ ââ ââ 
New words: âQuickâ âredâ âð¦â âjumpedâ âoverâ âaâ âpterodactylâ

[edit] 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 4083 C++23 views::as_rvalue used to accept non-input ranges made rejected [edit] See also

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