std::ranges::views::as_rvalue, std::ranges::as_rvalue_view - cppreference.com (original) (raw)

1. A range adaptor that represents a view of underlying view whose elements are rvalues.

Contents

• 1 Data members
• 2 Member functions
  • 2.1 Inherited from std::ranges::view_interface
• 3 std::ranges::as_rvalue_view::as_rvalue_view
  • 3.1 Parameters
• 4 std::ranges::as_rvalue_view::base
• 5 std::ranges::as_rvalue_view::begin
• 6 std::ranges::as_rvalue_view::end
• 7 std::ranges::as_rvalue_view::size
• 8 std::ranges::as_rvalue_view::reserve_hint
  • 8.1 Deduction guides
  • 8.2 Helper templates
  • 8.3 Notes
  • 8.4 Example
  • 8.5 Defect reports
  • 8.6 See also

[edit] Data members

[edit] Member functions

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](as%5Frvalue%5Fview.html#base)_ via its default member initializer (= V()).

2. Initializes _[base](as%5Frvalue%5Fview.html#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](as%5Frvalue%5Fview.html#base)_ ;.

2. Move-constructs the result from the underlying view. Equivalent to return std::move(_[base](as%5Frvalue%5Fview.html#base)_ );.

std::ranges::as_rvalue_view::size

Returns the size of the view if the view is bounded. Equivalent to return ranges::size(_[base](as%5Frvalue%5Fview.html#base)_ );.

std::ranges::as_rvalue_view::reserve_hint

Returns ranges::reserve_hint(_[base](as%5Frvalue%5Fview.html#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 #include #include #include #include   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 "“" + s + "”"; });   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: “” “” “” “” “” “” “” New words: “Quick” “red” “🦊” “jumped” “over” “a” “pterodactyl”

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

[edit] See also