Add utility IsCompileTimeConstant and use it in HybridFunctor

Summary

The type-trait IsIntegralConstant checks exactly for a type std::integral_constant<T,value> but does not allow any derived classes or user-defined classes with the same interface. Example of such compile-time constant is std::is_same<S,T>.

The new utility is directly used to implement HybridFunctor to allow a wider range of compiler-time input.

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requested review from @santiago.ospina

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• 619b5051 - add test for IsCompileTimeConstant

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• 6ce2e570 - Add utility IsCompileTimeConstant and use it in HybridFunctor
• 35e3257e - add test for IsCompileTimeConstant
• 450d3eff - Add changelog entry

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Great addition! Looks good to me.

approved this merge request

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• a13521d2 - Check constexpr property of members in IsCompileTimeConstant

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I'm happy with this as is. But out of curiosity: Is there any application where you have something that looks like an std::integral_constant but is not derived from one? If not, we may simply check for the latter instead of introducing a new concept.

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• 86c32edb - Check for derived from integral_constant

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added 3 commits

• ed9417c7 - Add utility IsCompileTimeConstant and use it in HybridFunctor
• 129c7ead - add test for IsCompileTimeConstant
• c733f723 - Add changelog entry

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merged

mentioned in commit 364d0fd4