NAME¶

std::queue::size - std::queue::size

Synopsis¶

size_type size() const;

Returns the number of elements in the underlying container, that is, c.size().

Parameters¶

(none)

Return value¶

The number of elements in the container.

Complexity¶

Constant.

Example¶

// Run this code

#include <algorithm>
#include <iostream>
#include <queue>

int main()
{
std::queue<int> container;

std::cout << "Initially, container.size(): " << container.size() << '\n';

for (int i = 0; i < 7; ++i)
container.push(i);

std::cout << "After adding elements, container.size(): " << container.size() << '\n';
}

Output:¶

Initially, container.size(): 0
After adding elements, container.size(): 7

See also¶

empty checks whether the underlying container is empty
(public member function)