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The tag namespace shared by enum, struct and union is separate and must be prefixed by the type keyword (enum, struct or union) in C, i.e., after enum a {a} b, enum a c must be used and not a c. Because the tag namespace is separate to the identifier namespace, enum a {a} b is allowed but enum a {a, b} b is not because the constants are in the same namespace as the variable identifiers, the identifier namespace.
Dec 14, 2008 · In C language, an enum is guaranteed to be of size of an int. There is a compile time option (-fshort-enums) to make it as short (This is mainly useful in case the values are not more than 64K). There is no compile time option to increase its size to 64 bit. edited Aug 16, 2019 at 20:52. S.S. Anne.
Nov 2, 2009 · In particular, you can see that a C enum doesn't really provide type safety, as you can use an int in place of an enum value and vice versa. In addition, this depends on the declaration order of the enum values: fragile to say the least. In addition, please see Chuck's comment; if the enum items are non-contiguous (e.g. because you specified ...
Dec 7, 2015 · Why typedef the enum. A typedef allows you to define new types. This allows you to make your intent more clear. char id; // but my id is a number! typedef unsigned char uint8; // ok now we can use uint8 instead of char. uint8 id; // better! Now we know we should only interpret id as a number.
One option suggested in the comments is to add an extension, which is simple enough: public static T ToEnum<T>(this string value) {. return (T) Enum.Parse(typeof(T), value, true); } StatusEnum MyStatus = "Active".ToEnum<StatusEnum>(); Finally, you may want to have a default enum to use if the string cannot be parsed:
A better approach could be to use extension method instead. To do this, convert Enumerations.GetEnumDescription 's Enum value parameter to this Enum value and then call it like string description = ((MyEnum)value).GetEnumDescription() – gkc. Nov 25, 2014 at 14:09. 10.
Nov 4, 2008 · Also notice the scoping. In the C++ strongly-typed enum class I used my_error_type_t:: to access each scoped enum class member. But, in the C-style weakly-typed regular enum, very similar scoping can be achieved, as I demonstrated, simply be prefixing each enum member name with MY_ERROR_TYPE_.
Aug 20, 2013 · The new enums are "enum class" because they combine aspects of traditional enumerations (names values) with aspects of classes (scoped members and absence of conversions). So, as mentioned by other users, the "strong enums" would make the code safer. The underlying type of a "classic" enum shall be an integer type large enough to fit all the ...
Unfortunately, C types like int, or worst yet, enums, are fairly unpredictably sized (changes by compiler, platform, etc), so knowing the memory layout of anything containing an enum can be dodgy unless your other programming language's compiler is also the C compiler AND it has some in-language mechanism to exploit that knowledge.
Feb 26, 2013 · the in-restaurant status (extra points for using an enum!) The restaurant status is walk-in or call-in (call ahead of time to put name on waiting list) Here's the structure of mine: char name[30]; int groupSize; enum status{call, wait}; struct restaurant *nextNode; I'm asking because I get this warning when I compile:
