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Showing content from https://timsong-cpp.github.io/cppwp/n4140/constexpr.functions below:

[constexpr.functions]

17 Library introduction [library] 17.6 Library-wide requirements [requirements] 17.6.5 Conforming implementations [conforming] 17.6.5.6 constexpr functions and constructors [constexpr.functions]

This standard explicitly requires that certain standard library functions are constexpr ([dcl.constexpr]). An implementation shall not declare any standard library function signature as constexpr except for those where it is explicitly required. Within any header that provides any non-defining declarations of constexpr functions or constructors an implementation shall provide corresponding definitions.


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