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std::set<Key,Compare,Allocator>::size

From cppreference.com
< cpp‎ | container‎ | set

[edit template]
 
C++
 
Containers library
 
std::set
Member functions
Non-member functions
(until C++20)(until C++20)(until C++20)(until C++20)(until C++20)
Deduction guides(C++17)
 
size_type size() noexcept;
 (noexcept since C++11)
(constexpr since C++26)

Returns the number of elements in the container.

Contents

[edit] Return value

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

[edit] Complexity

Constant.

[edit] Example

[edit]
Run this code
#include <cassert>
#include <set>
 
int main()
{
    std::set<int> 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]
(C++17)(C++20)
 returns the size of a container or array
(function template) [edit]
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