Apparently, consteval is going to be a keyword in C++20. The cppreference page for it is currently blank. What is it going to be and how does it relate to constexpr?
What is consteval?
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It declares immediate functions, that is, functions that must be evaluated at compile time to produce a constant. (It used to be spelled
constexpr!in a previous revision of the paper.) In contrast,constexprfunctions may be evaluated at compile time or run time, and need not produce a constant in all cases.The adopted paper is P1073R3, which is not yet publicly available, but a previous revision is available and the introductory (motivation and high-level description) portion is about the same (except that the "Source Locations" section is deleted in R3).