std::vector::size - cppreference.com

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# std::vector::size

From cppreference.com
< cpp‎ | container‎ | vector

[edit template]

size_type size() const; |  |

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

### [edit] Parameters

(none)

### [edit] Return value

The number of elements in the container.

### [edit] Exceptions

(none) | (until C++11)
`noexcept` specification: noexcept | (since C++11)

### [edit] Complexity

Constant.

### [edit] Example

[edit]

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

Run this code

    #include <vector>
    #include <iostream>

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

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

Output:

    nums contains 4 elements.

### [edit] See also

capacity | returns the number of elements that can be held in currently allocated storage (public member function) [edit]
empty | checks whether the container is empty (public member function) [edit]
max_size | returns the maximum possible number of elements (public member function) [edit]
resize | changes the number of elements stored (public member function) [edit]

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Category:

- unconditionally noexcept