enumeration

问题 Ok guys, well i'd like to achieve an effect of nested enumeration for easy grouping some constant strings. Something like the pseudo code bellow: Enum gKS Colby = "Hello" Hays = "World" end Enum Enum gMA Dodge = "Seven" Muscatine = "Ports" end Enum Enum gCountry north as gMA south as gKS end Enum Public USA as gCountry So the code bellow should output a " Seven " message: sub dol() msgbox USA.north.Dodge end sub I don't want use types or classes because no initialisation is needed since all

问题 I'm having some trouble with iteration and keeping track of various indices and values at different points in my list (I'm new to Python). I am running a series of cycles, but want to determine their starts and end times. Experiments starts at around 0 and end at around 50. Here is what a list of cycles look like: c = [0, 10, 11, 48, 50.5, 0.48, 17, 18, 23, 29, 33, 34.67, 50.1, 0.09, 7, 41, 45, 50] Here is an example of what the output should look like: C 1: Start: (0, 0) # starts at index 0,

问题 I have an enumeration that is shared between multiple threads: public enum Action { Read, Write, None } Within a class I have a variable of Action type: public Action _action; This is a shared variable, that is, it is updated and read from multiple threads. For example, from one thread I do: _action = Action.Read And from another one: if (_action == Action.Read) { } else if (_action == Action.Write) { } else if (_Action == Action.None) { } else { } So I would like to use Interlock to update

问题 Enumeration works as expected when I use it in a maven project(with the same Scala version). object t { object DashStyle extends Enumeration { val Solid,ShortDash = Value } def f(style: DashStyle.Value) = println(style) def main(args: Array[String]) = f(DashStyle.Solid) } But when it runs in Apache Zeppelin(Zeppelin 0.6, Spark 1.6, Scala 2.10, Java 1.8) object DashStyle extends Enumeration { val Solid,ShortDash = Value } def f(style: DashStyle.Value) = println(style) f(DashStyle.Solid) It

问题 I have a database schema having more than 40 tables out of which 25 are enumerations having following fields 1. Id (Int) 2. Item (String) I discussed this scenario here and found having different tables would be better approach. I implemented this but now I am facing one more issue I have a table Questionnaire having following fields 1. Id 2. Question in which I have to bind the List reference means which list belongs to which question. As suggested for keeping one lookup table better to use

问题 Could someone help with the following compiler error? I am trying to create a Java like enums in C++ and I am getting compiler errors in Visual Studio 2015. I am using these Java like Enum classes as members of a struct and I would like the sizeof(MessageType) to be the same as the Value type. I know that this will require that I remove the mValueStr member from the class, however then I will not be able to look up the value from a string. Any suggestions on how I might be able to achieve

问题 What is wrong with this code ? I get Collection <NSCFArray: 0x101e1b6d0> was mutated while being enumerated It is NSMutableArray, not NSArray NSMutableArray *set = [[NSMutableArray alloc]initWithObjects:@"first", @"second", @"third", @"third", nil]; [set enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { if([obj isEqualToString:@"third"]) { [set removeObjectAtIndex:idx]; } }]; [pool drain]; 回答1: The problem is you're changing the array during enumeration. This is no-go. Please

问题 I'm trying to exchange the ordering of particular items of an IEnumerable . Given an IEnumerable<int> a; of the elements: 1, 2, 3, 4, 5 and what I want to do is write a exchange iterator which resulting a.Exchange(1, 2) in: 1, 3, 2, 4, 5 But I don't want the enumerable be iterated more than once with this simple purpose. What I have so far is: public static IEnumerable<T> Exchange<T>( this IEnumerable<T> source, int index1, int index2) { var i=0; foreach(var y in source) { if(index1==i) { var

问题 My goal is to store the input.dat file into an array of a struct and output the total number of Fords, Chevys, Hondas, and Toyotas which are enumerations. I've hit a roadblock after working on this for quite a few hours. When I debug the code in Visual studio i receive negative numbers in the output. I'm stuck and could really use an explanation as to what I'm missing. #include "stdafx.h" #include <iostream> #include <iomanip> #include <string> #include <conio.h> #include <fstream> using

问题 I am sorry ahead of time for how this question may turn out. I really can't think of a good way to word it. I would very much like to have an enumeration extend another for the sake of use method abstraction. It would make life so much easier. Alas, I cannot. So, does anyone know how I may be able to implement a feature like an abstract method call? I tried an interface but quickly learned that you can't use an Enum generic. Edit 1: I just found this, I will look at it and see if I can derive