Add error message in static_assert

dftlibs / xcfun

XCFun: A library of exchange-correlation functionals with arbitrary-order derivatives

https://dftlibs.org/xcfun/

Mozilla Public License 2.0

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Closed robertodr closed 2 years ago

robertodr commented 2 years ago

It is optional only when compiling with C++17 or later. Fixes #157