isocpp / isocpp/CppCoreGuidelines

Address not_null design question

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@GabrielDosReis is already working on this.

Since Dec 5, 2019.

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Description

#379 #399 #509
see also #225

Microsoft/GSL not_null has an implicit conversion from T to not_null which doesn't follow the guidelines explicit conversions. However, making it explicit as the guidelines direct causes problems including being too verbose to use.

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