How do I determine if a Nullable(of Enum) is indeed an Enum by means of reflection? I'm working with a method that dynamically populates an object of type T with an IDataReader retrieved from a database call. At its essence, it loops through the datareader's ordinals, and all the properties of T and populates the properties that match ...
I've just started using Java's enums in my own projects (I have to use JDK 1.4 at work) and I am confused as to the best practice of using JavaDoc for an enum. I have found that this method works, but the resultant code is a little unrefined: /** * Doc for enum */ public enum Something { /** * First thing */ FIRST_THING, /** * Second t...
C++ is mostly a superset of C, but not always. In particular, while enumeration values in both C and C++ implicitly convert into int, the reverse isn't true: only in C do ints convert back into enumeration values. Thus, bitflags defined via enumeration declarations don't work correctly. Hence, this is OK in C, but not in C++: typedef en...
Suppose we have some named enums: enum MyEnum { FOO, BAR = 0x50 }; What I googled for is a script (any language) that scans all the headers in my project and generates a header with one function per enum. char* enum_to_string(MyEnum t); And a implementation with something like this: char* enum_to_string(MyEnum t){ ...
How do you get the max value of an enum? ...
How do you use enums in Oracle using SQL only? (No PSQL) In MySQL you can do: CREATE TABLE sizes ( name ENUM('small', 'medium', 'large') ); What would be a similar way to do this in Oracle? ...
I have a bunch of enum types in some library header files that I'm using, and I want to have a way of converting enum values to user strings - and vice-versa. RTTI won't do it for me, because the 'user strings' need to be a bit more readable than the enumerations. A brute force solution would be a bunch of functions like this, but I f...
Are C# enums typesafe? If not what are the implications? ...
Hi, I thought I understood Java generics pretty well, but then I came across the following in java.lang Class Enum<E extends Enum<E>> Could someone explain how to interpret this type parameter? Bonus points for providing other examples of where a similar type parameter could be used. Cheers, Don. ...
I have found that there is generally a singe type or namespace that takes in any particular enum as a parameter and as a result I have always defined those enums there. Recently though, I had a co-worker make a big deal about how that was a stupid thing to do, and you should always have an enum namespace at the root of your project where...
What are the pros and cons of using nested public C++ classes and enumerations? For example, suppose you have a class called printer, and this class also stores information on output trays, you could have: class printer { public: std::string name_; enum TYPE { TYPE_LOCAL, TYPE_NETWORK, }; class out...
It is common knowledge that built-in enums in C++ are not typesafe. I was wondering which classes implementing typesafe enums are used out there... I myself use the following "bicycle", but it is somewhat verbose and limited: typesafeenum.h: struct TypesafeEnum { // Construction: public: TypesafeEnum(): id (next_id++), name("") {} ...
Hi there, When compiling the following simpleType with the XJC compile (from the JAXB package)... <xs:simpleType name="test"> <xs:annotation> <xs:appinfo> <jaxb:typesafeEnumClass/> </xs:appinfo> </xs:annotation> <xs:restriction base="xs:string"> <xs:enumeration value="4"> <xs:annota...
I'm trying to design a form which contains a dropdown box containing a list of grocery item choices. What criteria should I look at when trying to decide on whether to use a java enum or a lookup table? Also, I will need to plan ahead for i18n support for the dropdown strings. ...
Is there a way to write an enumeration that can be extended. I have several methods that I would like to alway have available for my enumerations. For example I use an enumeration for my database fields. I include the actual field name in the database. public enum ORDERFIELDS { OrderID("Order_ID"); private String...
In C#, I am using a library that defines an enum. I would like to allow consumers of my code (in a different assembly) to pass in an enum value as a parameter to one of my functions without having to reference the underlying library themselves. Is there a way for me to expose the library's enumeration to my consumers? ...
I have some code which needs to ensure some data is in a mysql enum prior to insertion in the database. The cleanest way I've found of doing this is the following code: sub enum_values { my ( $self, $schema, $table, $column ) = @_; # don't eval to let the error bubble up my $columns = $schema->storage->dbh->selectrow_hashr...
Hey guys. I am wondering what the best ways to save enums into a database is. I know there are name() and valueOf() methods to make it into a String back. But are there any other (flexible) options to store these values? Is there a smart way to make them into unique numbers (ordinal() is not safe to use)? Any comments and suggestions...
I was reading some 3rd party code and I found this: x.Flags = x.Flags ^ Flags.Hidden; What does it do? I've used '&' and '|' for bitwise 'and' and 'or' with enums, but it's the first time I see the that symbol... ...
Given the following java enum: public enum AgeRange { A18TO23 { public String toString() { return "18 - 23"; } }, A24TO29 { public String toString() { return "24 - 29"; } }, A30TO35 { public String toString() { return "30 - 35"; } }, } Is th...