std::unordered_set<Key,Hash,KeyEqual,Allocator>::size - cppreference.com (original) (raw)

| size_type size() const noexcept; | | (since C++11) (constexpr since C++26) | | --------------------------------- | | ------------------------------------- |

Returns the number of elements in the container.

[edit] Return value

std::distance(begin(), end())

[edit] Complexity

Constant.

[edit] Example

#include #include   int main() { std::unordered_set nums{4, 2, 4, 2}; assert(nums.size() == 2); }

[edit] See also

| | checks whether the container is empty (public member function) [edit] | | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | returns the maximum possible number of elements (public member function) [edit] | | | returns the size of a container or array (function template) [edit] |