How to convert C array to std::initializer_list?

Question

I know a pointer to an array and its size. What container can be created from it? I tried to do this:

std::initializer_list<int> foo(arr, arr + size);

It works for the MSVC, but not for the gcc

Answer 1

std::initializer_list is a reference-type designed just for supporting list-initialization, and only has the default-ctor, and implicitly copy-ctor. Any other ctor is an extension.

What you can do is initializing the target-container directly from an iterator-range, without involving any intermediate views.

The standard container to use unless you know better would be std::vector. Or would using a simple view like std::span be enough for you?