Std Error Code To stay C ish anyway I want to use std error code or similar with more data because I do like the concept However there does not seem to be any consenus on how to actually use them I have seen at least four different ways of passing them between function calls two of them with multiple semantics
From the side of implementation they are not fundamental types so that compilers would specifically support conversion from and to the types std errcis implemented as class enum enumeration and cannot implement a conversion operator function as a class would std error code is a class so could implement the non explicit constructor from std errc which I thought about deriving from std error code and extend the class with a pointer to an underlying std error code and methods to get all these underlying objects However I am not sure if this technique would be a good idea because I read that care was taken when designing std error code to make it efficient
Std Error Code
Std Error Code
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Std error code ec GetLastError std generic category But I m not sure whether or not the values returned by GetLastError map nicely to the well known constants from std errc I ve read in Boost s system library that they do for Boost s implementation of error code but I m asking about the std implementation not about Boost s Std error code int enum std error code
My setup macOS with Xcode clang From examples of std error code it seems that it s compatible with enum e g you can assign an enum to it but when comparing it with an integer like this if I don t quite get why do we need to make a distinction between error code std error code and an error condition std error condition aren t they the same thing
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Certain functions in the C standard library report errors via a std error code 19 5 2 1 object That object s category member shall return std system category for errors originating from the operating system or a reference to an implementation defined error category object for errors originating elsewhere Std error code can wrap errno with the added improvement that you can convert it to your own errors Take
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To stay C ish anyway I want to use std error code or similar with more data because I do like the concept However there does not seem to be any consenus on how to actually use them I have seen at least four different ways of passing them between function calls two of them with multiple semantics
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From the side of implementation they are not fundamental types so that compilers would specifically support conversion from and to the types std errcis implemented as class enum enumeration and cannot implement a conversion operator function as a class would std error code is a class so could implement the non explicit constructor from std errc which
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Std Error Code - Std error code ec GetLastError std generic category But I m not sure whether or not the values returned by GetLastError map nicely to the well known constants from std errc I ve read in Boost s system library that they do for Boost s implementation of error code but I m asking about the std implementation not about Boost s
