enumeration

问题 How can I make an enumeration of a complex type? For example, I want to store the following data into a xsd enumeration called Measurings description tag item item tag fileName each one of these attributes has an specific value and this set makes one registry in my ennumeration. But the problem is that as far as I know, it's allowed just the "value" attribute in an enumeration. 回答1: There is nothing like complex type enumeration in XML Schema. You'll need to organize it externally. See http:/

问题 I have a Trigger Manager scenario where I delegate the triggers (in other-words subscribe triggers) to different handlers . For now I have three handler types, I use a switch-case with enum (enum here is the handler type) to redirect to correct handler. But my code seems not extensible, its not generic and it doesn't follow SOLID principle. Imagine if I need to have more handler I will be eventually coming and editing my switch case code and I will have more cases where it affects the

问题 This question already has answers here : What is the best way to modify a list in a 'foreach' loop? (11 answers) Closed 6 years ago . There is a typical collection of some class objects e.g. string for a simplicity IList<string> collection = new List<string>(); During the program flow some function needs to operate on the collection, process class object and depending on the result of operation remove processed class object from collection. E.g. following example of strings if string is

问题 I am playing around with trying to make a simple Roguelike game to learn C# a bit better. I am trying to make a general method that I can give it an Enum as an argument, and it will return how many elements are in that Enum as an int. I need to make it as general as possible, because I will have several different classes calling the method. I have searched around for the last hour or so, but I couldn't find any resources here or otherwise that quite answered my question... I'm still at a

问题 I am studying the internal mechanics of the iterator methods, and I noticed a strange difference in behavior between the IEnumerator<T> obtained by an iterator and the IEnumerator<T> obtained by a LINQ method. If an exception happens during the enumeration, then: The LINQ enumerator remains active. It skips an item but continues producing more. The iterator enumerator becomes finished. It does not produce any more items. Example. An IEnumerator<int> is enumerated stubbornly until it completes

问题 I am trying to do a entity component system design for simulation. Here is what confuses me now. I am trying to make a Entity class Entity.h class Entity { public: Entity(); virtual ~Entity() = 0; //---------------------Methods---------------------// void AddComponent(const shared_ptr<Component> component); template<class T> T* GetComponent() const; //---------------------Members---------------------// vector<shared_ptr<Component>> m_components; } Entity.cpp template<typename T> T* Entity:

问题 I have a model that fetches all the games from a particular city. When I get those games I want to filter them and I would like to use the reject method, but I'm running into an error I'm trying to understand. # STEP 1 - Model class Matches < ActiveRecord::Base def self.total_losses(cities) reject{ |a| cities.include?(a.winner) }.count end end # STEP 2 - Controller @games = Matches.find_matches_by("Toronto") # GOOD! - Returns ActiveRecord::Relation # STEP 3 - View cities = ["Toronto", "NYC"]

问题 I have a legacy database table that, for simplicity sake looks like: table address{ varchar line1 varchar line2 varchar line3 varchar(1) deliveryline } There is a check constraint on deliveryline guaranteeing it has the values '1,'2', or '3' . This seems like a good candidate for enumeration in hibernate. I have an entity that looks like this representing the Address table: public class Address{ String line1; String line2; String line3; DeliveryLine deliveryLine; } I normally use @Enumerated

问题 Are one of these enumerations faster than the other or about the same? (example in C#) Case 1: Dictionary<string, object> valuesDict; // valuesDict loaded with thousands of objects foreach (object value in valuesDict.Values) { /* process */ } Case 2: List<object> valuesList; // valuesList loaded with thousands of objects foreach (object value in valuesList) { /* process */ } UPDATE: Background: The dictionary would be beneficial for keyed search elsewhere (as opposed to iterating through a

问题 Is there a way to write an enumeration that can be extended. I have several methods that I would like to always 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 FieldName; private ORDERFIELDS(String fname) { this.FieldName = fname; } public String getFieldName() { return FieldName; } } 回答1: If I understand correctly, what you'd like to do