constexpr functions aren't restricted to compile time, they can also be used at runtime. Thus constexpr functions can show up in the final executable. Constex

constexpr functions aren't restricted to compile time, they can also be used at runtime. Thus constexpr functions can show up in the final executable. Constexpr functions can also control what gets compiled in the first place. For example you can use the result of a constexpr evaluation to instantiate a template.