Question

I am trying to find template functions that do:

template <typename T>
T add(T lhs, T rhs) {
    return lhs + rhs;
}

(for add, subtract, multiply, and divide).

I remember there being a standard set of functions for this– do you remember what they are?

Answer 1

In the header <functional>, you’ll find things like std::plus, std::minus, std::multiplies, and std::divides.

They’re not functions, either. They’re actually functors.