std::flat_multiset<Key,Compare,KeyContainer>::extract - cppreference.com (original) (raw)

| 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.

[edit] Return value

std::move(c).

[edit] Complexity

Constant.

[edit] Example

#include #include #include #include #include #include   int main() { std::flat_multiset 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>);   std::println("{}", c); }

Output:

[edit] See also

| | replaces the underlying container (public member function) [edit] | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |