std::flat_set<Key,Compare,KeyContainer>::extract
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C++
Containers library
(C++17) | ||||
| Sequence | ||||
(C++11) | ||||
(C++26) | ||||
(C++26) | ||||
(C++11) | ||||
| Associative | ||||
| Unordered associative | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
| Adaptors | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
| Views | ||||
(C++20) | ||||
(C++23) | ||||
| Tables | ||||
| Iterator invalidation | ||||
| Member function table | ||||
| Non-member function table |
std::flat_set
| container_type extract() &&; |
(since C++23) | |
Extracts adapted container c. Equivalent to return std::move(c);.
After this operation *this is empty, even if an exception is thrown.
Contents |
[edit] Return value
std::move(c).
[edit] Complexity
Constant.
[edit] Example
Run this code
#include <cassert> #include <flat_set> #include <print> #include <type_traits> #include <utility> #include <vector> int main() { std::flat_set<int> set{1, 2, 3}; const auto size{set.size()}; auto c{std::move(set).extract()}; assert(c.size() == size); assert(set.empty(); assert(set.keys().empty(); assert(set.values().empty(); / The default keys container is std::vector: static_assert(std::is_same_v<decltype(c), std::vector<int>>); std::println("{}", c); }
Output:
[1, 2, 3]
[edit] See also
| replaces the underlying container (public member function) [edit] |
