std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>::size - cppreference.com (original) (raw)

| size_type size() const noexcept; | | (since C++23) | | --------------------------------- | | ------------- |

Returns the number of elements in the container adaptor. Equivalent to: return c.keys.size().

[edit] Parameters

(none)

[edit] Return value

The number of elements in the container adaptor.

[edit] Complexity

Constant.

[edit] Example

#include #include   int main() { std::flat_map<int, char> nums{{1, 'a'}, {1, 'b'}, {2, 'c'}, {2, 'd'}}; assert(nums.size() == 2); }

[edit] See also

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