std::valarray::sum (3) Linux Manual Page

std::valarray<T>::sum – std::valarray<T>::sum

Synopsis

T sum() const;

Computes the sum of the elements.
The function can be used only if operator+= is defined for type T. If the std::valarray is empty, the behavior is undefined. The order in which the elements are processed by this function is unspecified.

Parameters

(none)

Return value

The sum of the elements.

Example

// Run this code

#include <iostream>

#include <valarray>
int main()

{
    std::valarray<int> a = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    std::cout << a.sum() << '\n';
}

Output:

  55

See also

           applies a function to every element of a valarray
apply (public member function)
           sums up a range of elements
accumulate (function template)