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std::flat_set<Key,Compare,KeyContainer>::size

From cppreference.com
< cpp‎ | container‎ | flat set
 
 
 
 
size_type size() const noexcept;
(since C++23)

Returns the number of elements in the underlying container, that is, std::distance(begin(), end()).

Contents

[edit] Parameters

(none)

[edit] Return value

The number of elements in the container adaptor.

[edit] Complexity

Constant.

[edit] Example

The following code uses size to display the number of elements in a std::flat_set<int>:

#include <iostream>
#include <flat_set>
 
int main()
{
    std::flat_set<int> nums{1, 3, 5, 7};
 
    std::cout << "nums contains " << nums.size() << " elements.\n";
}

Output:

nums contains 4 elements.

[edit] See also

checks whether the container adaptor is empty
(public member function) [edit]
(C++17)(C++20)
returns the size of a container or array
(function template) [edit]
returns the maximum possible number of elements
(public member function) [edit]