std::valarray::sum(3)

✨ NAME ✨

std::valarray::sum — okay so this is literally std::valarray::sum, bestie. Welcome to the std::valarray::sum(3) page from the C++ Standard Libary manual — yes, that's the manual name, and yes, we're doing this. This whole page is about one member function with "add up the elements" energy. 💅

💅 Synopsis 💅

T sum() const;

It computes the sum of the elements. You can use this function only if operator+= is defined for type T. If the std::valarray is empty, the behavior is undefined — like, genuinely undefined, not a cute little edge case. The order in which the elements are processed by this function is unspecified. 🫶

🌸 Parameters 🌸

(none) — literally no parameters, bestie. Not a single one. 🎀

🎀 Return value 🎀

The sum of the elements. That's the whole return value. Iconic. ⭐

🦋 Example 🦋

Here's the code, and yes, run it:

#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 🔥

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

💖 cute little sign-off: this page is from cppreference.com, dated 2024.06.10, and it's the std::valarray::sum(3) entry. slay, bye bestie 🫶✨