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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../container/vector/size.html below:

std::vector<T,Allocator>::size - cppreference.com

size_type size() const;

(noexcept since C++11)
(constexpr since C++20)

Returns the number of elements in the container.

[edit] Return value

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

[edit] Complexity

Constant.

[edit] Example

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

#include <cassert>
#include <vector>
 
int main()
{
    std::vector<int> nums;
    assert(nums.size() == 0);
    nums = {1, 2, 3, 4};
    assert(nums.size() == 4);
}

[edit] See also returns the number of elements that can be held in currently allocated storage
(public member function) [edit] checks whether the container is empty
(public member function) [edit] returns the maximum possible number of elements
(public member function) [edit] changes the number of elements stored
(public member function) [edit] returns the size of a container or array
(function template) [edit]

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