Pointer arithmetic with array_view

Question

I've just seen the first part of Herb Sutter's "Writing Good C++14... By Default" (https://www.youtube.com/watch?v=hEx5DNLWGgA) and i have a (possible stupid) question regarding array_view.

The presented case was sending an array_view instead of a pointer and length in order to avoid pointer arithmetic, but how can array_view handle a case like this:

int vec[10];
func(vec+2, 5); //start from the 2nd element and process 5 of them

Does array_view support this kind of stuff or i just got the use-case wrong?

Answer 1

With string_view you can do this:

const char* str = "hello world!"; 
func(std::experimental::string_view(str + 2, 5));

That is use one of the constructors of the view to to build it from a substring.

So with array_view you'll probably be able to do this:

int vec[10];
func(std::experimental::array_view(vec + 2, 5));

Note: There doesn't seem to be any official array_view as of c++14.