Parallel Computing for Data Science

184 CHAPTER 7. THRUST AND RTH

Note that though dx.begin() acts like a pointer, it is called an iterator,

with broader powers than those of a pointer.

Most of the vector operations in the code are described in the comments.

But where things get interesting is the struct ismultk, which though an

ordinary C struct, is known as a functor in C++ terminology.

A functor is a C++ mechanism to produce a callable function, largely

similar in goal to using a pointer to a function but with the added notion

of saved state. This is done by turning a C++ struct or class object into

a callable function. Since structs and classes can have member variables,

we can store ...