I’m currently playing around with the Boost.Enum proposal from the Boost Vault (filename enum_rev4.6.zip). Although it was never officially submitted for inclusion into Boost, it’s useable as-is. (Documentation is lacking but is made up for by clear source code and good tests.) Boost.Enum lets you declare an enum like this: BOOST_ENUM_VALUES(Level, const char*, (Abort)(“unrecoverable problem”) … Read more
Yes, just code against the base Enum type, e.g. public static void Something(this Enum e) { // code here } The down-side is you’ll probably end up doing some quite nasty stuff like finding the real base type using Enum.GetUnderlyingType, casting, and going down different branches depending on what the base type of the enum … Read more
java.util.Collections.enumeration(set) Javadoc Returns an enumeration over the specified collection. This provides interoperability with legacy APIs that require an enumeration as input.
Generally you should only use enumeration where there is a clear set of items that will not change, e.g. primary colours, or continent names. Otherwise lookup tables with appropriately implemented foreign keys are pretty much always the best option. There is a possible variation on the lookup table option where you potentially have a large … Read more
Differences: Enums extend java.lang.Enum and gain all of its nice features: Automatic singleton behaviour through correct serialization Automatic human-readable .toString method on enum values without the need to duplicate your enum names .name and .ordinal special-purpose methods Usable in high-performance bitset-based EnumSet and EnumMap classes Enums are treated by the language specially: Enums use a … Read more
Per that standard [dcl.enum] The enumeration type declared with an enum-key of only enum is an unscoped enumeration, and its enumerators are unscoped enumerators. The enum-keys enum class and enum struct are semantically equivalent; an enumeration type declared with one of these is a scoped enumeration, and its enumerators are scoped enumerators. The optional identifier … Read more
You should replace your getEnumNameForValue by a call to the name() method.
As an easy and clean way of using an Enumeration with the enhanced for loop, convert to an ArrayList with java.util.Collections.list. for (TableColumn col : Collections.list(columnModel.getColumns()) { (javax.swing.table.TableColumnModel.getColumns returns Enumeration.) Note, this may be very slightly less efficient.
You call nextElement() twice in your loop. This call moves the enumeration pointer forward. You should modify your code like the following: while (e.hasMoreElements()) { String param = e.nextElement(); System.out.println(param); }
In python, using locals which returns a dictionary containing all the local bindings, thus, avoiding eval: >>> foo1 = “Hello world” >>> foo2 = “bar” >>> foo3 = {“1″:”a”, … “2”:”b”} >>> foo4 = “1+1” >>> import pprint >>> pprint.pprint(locals()) {‘__builtins__’: <module ‘__builtin__’ (built-in)>, ‘__doc__’: None, ‘__name__’: ‘__main__’, ‘foo1’: ‘Hello world’, ‘foo2’: ‘bar’, ‘foo3’: {‘1’: … Read more