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Showing content from http://en.cppreference.com/w/cpp/language/attributes/../../container/unordered_multimap/empty.html below:

std::unordered_multimap<Key,T,Hash,KeyEqual,Allocator>::empty - cppreference.com

bool empty() const noexcept;

(since C++11)
(constexpr since C++26)

Checks if the container has no elements.

[edit] Return value

true if the container is empty, false otherwise.

[edit] Complexity

Constant.

[edit] Example

The following code uses empty to check if a std::unordered_multimap<int, int> contains any elements:

Output:

Initially, numbers.empty(): true
After adding elements, numbers.empty(): false
[edit] See also returns the number of elements
(public member function) [edit] checks whether the container is empty
(function template) [edit]

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