Make SkFunction copyable so it can go in containers.
This totally overhauls the implementation to use ordinary inheritance-based type erasure. I give up for now getting my manual vtable shenanigans to work with MSVC. Still those same "expected ; before ), also expected ) before ;" errors.
I added support for uninitialized SkFunctions and operator=(), because it was fairly straightforward with this implementation.
The main downside here is that I've removed the inline implementation. All SkFunctions involve a heap allocation, even when just wrapping function pointers.
BUG=skia:
Review URL: https://codereview.chromium.org/1056673002
2 files changed