It's supposed to be part of "Guideline support library", see this section: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#S-gsl ht

It's supposed to be part of "Guideline support library", see this section: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#S-gsl https://github.com/isocpp/CppCoreGuidelines/blob/master/CppC... The only implementation so far seems to be from Microsoft: https://github.com/Microsoft/GSL/blob/master/include/gsl/gsl_util https://github.com/Microsoft/GSL/blob/master/include/gsl/gsl...