Considering a program is comprised entirely of constexpr functions (which are all capable of being computed at compile-time), is there a limit to how "levels" deep can constexpr functions be called? Could a whole program be computed at compile-time, given the right requisites, by using only constexpr functions?
How deeply nested can constexpr expressions be?
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The standard recommends in Annex B a limit that is at least 512, but a conforming implementation need not comply with the recommendation.