Add initial pass of C++20 invocable map with Call
operator.
#368
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Add initial pass of C++20 invocable map with
Call
operator.This flavour no longer requires a clang extension and so should unlock other compilers.
I'm keeping this in a separate CL since it's the first time both C++17 and C++20 versions for code in use and would like to flush out build failures.
In a downstream CL I will add this to
ObjectRef
to enable the new syntax and eventually update existing usage.#42