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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 ...
14 Δεκ 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.
3 Νοε 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 ...
7 Δεκ 2015 · typedef enum CarModels_e CarModels; // now we don't need to type enum every time! CarModels the_model; CarModels other_model // Less typing! Happier programmer! But still you have to type twice enum CarModels_e so they combine that too in one declaration: typedef enum /* Don't even need a name here anymore!
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.
enum Example { One = 1, Two = 2, Three = 3 } Enum.(Try)Parse() accepts multiple, comma-separated arguments, and combines them with binary 'or' |. You cannot disable this and in my opinion you almost never want it. var x = Enum.Parse("One,Two"); // x is now Three Even if Three was not defined, x would still get int value 3. That's even worse ...
4 Νοε 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_.
I am using a switch statement to return from my main function early if some special case is detected. The special cases are encoded using an enum type, as shown below. typedef enum { NEG_INF, ...
20 Αυγ 2013 · Enum: enum Color1 { COLOR1_RED, COLOR1_GREEN, COLOR1_BLUE } is comparable to Enum class: enum class Color1 { RED, GREEN, BLUE }. Accessing is similar: COLOR1_RED vs Color1::RED, but the Enum version requires you type "COLOR1" in each value, which gives more room for typos, which the namespace behaviour of an enum class avoids. –
@JCoombs I find this clean enough: public static IReadOnlyList<T> GetValues<T>() { return (T[])Enum.GetValues(typeof(T)); }. But yeah, performance difference is negligible in common usage. But yeah, performance difference is negligible in common usage.
