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- use `static constexpr inline' to avoid requiring
explicit declarations in object code
- use `const Foo* const' to maybe put into readonly
binary segment (at least for ELF DSOs)
- `constexpr' in function scope has storage, avoid
`static'
- don't use `constexpr' where there's no advantage,
like arrays
We'd like to avoid overhead of atomic initialization
for each function call. No idea how `static constexpr'
requiring storage in the standard plays with atomic
initialization requirement. Hearsay points that
`constexpr' without `static' in block scope behaves
more to our liking. It's all hazy though.
I'm not 100% sure if `static inline constexpr' has any
storage. Hopefully none, like a #define, and stuff
bigger than registers gets coalesced within the same
module, with small stuff being immediates.
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