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.
The sum of the elements.
| applies a function to every element of a valarray |
(public member function)
| sums up a range of elements |