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Don't mix future runtime customization constexpr.

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As discussed in https://github.com/isocpp/CppCoreGuidelines/issues/420
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Titus Winters 2015-12-15 11:30:04 -05:00
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@ -2079,6 +2079,13 @@ This is usually a very good thing.
Don't try to make all functions `constexpr`. Most computation is best done at run time.
##### Note
Any API that may eventually become configurable or customizable at runtime
should not be made `constexpr`. Such customization could not be evaluated by the
compiler, and any `constexpr` functions that depend upon that API will have to
be refactored or drop `constexpr`.
##### Enforcement
Impossible and unnecessary.