kile0 5a7093f983 Use the c++17 constexpr if in CheckRange if possible (#753) ...

* change c++17 to use constexpr if in CheckRange

* remove unnecessary macro

* use the portable feature test macro rather than direct version check

2018-11-28 11:52:11 -08:00

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gsl

Use the c++17 constexpr if in CheckRange if possible (#753)

2018-11-28 11:52:11 -08:00