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thanks. Just for curiosity what constexpr exactly does here? Does it help the optimization (like to bake the constant template parameters, and optimize out the function pointer?

Prokop Hapala
– Prokop Hapala

2019-08-29 07:26:45 +00:00
Commented Aug 29, 2019 at 7:26
constexpr is for a constant that the compiler can generate at compile time. Ofent (and in this case) compilers will generate the same code with just const, the main difference is that if you mark something as constexpr which the compiler can't generate at compile time it will fail to compile. see stackoverflow.com/questions/14116003/… and stackoverflow.com/questions/42107744/what-is-constexpr-in-c

Alan Birtles
– Alan Birtles

2019-08-29 08:28:46 +00:00
Commented Aug 29, 2019 at 8:28

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