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std::deque size() method

// Const version only
bool size() const noexcept;

Returns the number of elements in the deque, i.e. std::distance(begin(), end()).

Parameters​

(none)

Return value​

The number of elements in the deque.

Complexity​

Constant - O(1).

Exceptions​

(none)

Example​

Main.cpp
#include <deque>
#include <iostream>

int main()
{
    std::deque<int> nums {1, 3, 5, 7};

    std::cout << "nums contains " << nums.size() << " elements.\n";
}
Output
nums contains 4 elements.
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std::deque size() method

// Const version only
bool size() const noexcept;

Returns the number of elements in the deque, i.e. std::distance(begin(), end()).

Parameters​

(none)

Return value​

The number of elements in the deque.

Complexity​

Constant - O(1).

Exceptions​

(none)

Example​

Main.cpp
#include <deque>
#include <iostream>

int main()
{
    std::deque<int> nums {1, 3, 5, 7};

    std::cout << "nums contains " << nums.size() << " elements.\n";
}
Output
nums contains 4 elements.
This article originates from this CppReference page. It was likely altered for improvements or editors' preference. Click "Edit this page" to see all changes made to this document.
Hover to see the original license.