gsl/narrow should include <exception> #1044
Merged
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This file uses std::exception, so it should include the appropriate header.
Normally it gets the STL's "exception" header included via the gsl/assert file, but this is skipped with _HAS_EXCEPTIONS=0. I understand _HAS_EXCEPTIONS is undocumented and unsupported, but regardless, the appropriate header should be included here.
Alternatively, gsl/narrow should be modified to support _HAS_EXCEPTIONS=0, like gsl/assert was. But I'm not proposing that change. "exception" does define std::exception even with _HAS_EXCEPTIONS=0.