std::result_of is deprecated and removed in C++20, std::invoke_result is
in C++17 the library so not ready yet.
In the case of SkMakeArray there is no need for the full power of
std::invoke_result as SFINAE is not needed, nor is calling a method
supported. As a result a simple decltype is sufficient.
Bug: skia:11811
Change-Id: I6c07c380970cc2a991ab8bd457997320ba634e6c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/390476
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
7d8cdd5b7f