Constexpr Math Functions

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Actually, because of old and annoying legacy, almost none of the math functions can be constexpr, since they all have the side-effect of setting errno on various error conditions, usually domain errors.

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  4. Why do constant expressions have an exclusion for undefined behavior?
  5. Is is_constexpr possible in C++11?
  6. constexpr and initialization of a static const void pointer with reinterpret cast, which compiler is right?
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  14. C++11: Compile Time Calculation of Array
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  26. Why can I call a non-constexpr function inside a constexpr function?
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  30. Is constexpr really needed?

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