enum

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 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 and/or read it from different threads at the same

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: what is use of enum in typescript. If it's purpose is only to make code redable can't we just use constant for same purpose enum Color { Red = 1, Green = 2, Blue = 4 }; let obj1: Color = Color.Red; obj1 = 100; // does not show any error in IDE while enum should accept some specific values If there is no advantage of typechecking, Can't it be just written as. const BasicColor = { Red: 1, Green: 2, Blue: 4 }; let obj2 = BasicColor.Red; 回答1: First, in the following: const BasicColor = { Red: 1, Green: 2, Blue: 4 }; Red , Green , and Blue are

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Below is my code. NSMutableArray *arr = [[NSMutableArray alloc] init]; [arr addObject:@"5"]; [arr addObject:@"7"]; [arr addObject:@"8"]; [arr enumerateObjectsUsingBlock:^(NSString *obj,NSUInteger idx,BOOL *stop) { [arr replaceObjectAtIndex:idx withObject:@"10"]; }]; The Exception log I got *** Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection was mutated while being enumerated.' *** First throw call stack: (0x1596012 0x12a3e7e 0x161ecc5 0x158fe1b 0x158fa16 0x158f925 0x2ba4 0x1e87b7 0x1e8da7 0x1e9fab

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I get the following exception when I try to map an enum to smallint in OnModelCreating : InvalidCastException: Unable to cast object of type 'System.Byte' to type 'System.Int32'. I want to do this because in SQL Server an int is 4 bytes while a tinyint is 1 byte. Relevant code: Entity: namespace SOMapping.Data { public class Tag { public int Id { get; set; } public TagType TagType { get; set; } } public enum TagType { Foo, Bar } } DbContext: using Microsoft.AspNetCore.Identity.EntityFrameworkCore; using Microsoft.EntityFrameworkCore;

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'd like to create SKSpriteNodes with a WallType (please see code below), and only if that WallType is .Corner pass it a Side value for its orientation. The enums have raw values because I need to load them as numbers from a plist and be able to create them randomly. enum Side: Int { case Left = 0, Right } enum WallType: Int { case Straight = 0 case Corner(orientation: Side) } I get the error: "Enum with raw type cannot have cases with arguments" Is there a workaround where I can pass the SKSpriteNode a value for its orientation only when

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In the C++ interface to OpenCV, it seems easy enough to check the type of an image. If you have an image cv::Mat img = cv::imread("someImage.xyz") , you just do int theType = img.type() . However, as you would expect, calling img.type() just gives an integer, an not an enum name (e.g. CV_32FC1 ). Is there an easy way to print out the enum name (e.g. CV_32FC1 ) if I know the integer value of the OpenCV enum? 回答1: To my knowledge, such a function doesn't exist in OpenCV. I think you would be better off writing your own function to get those. A

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: For some reason, having a nested class with an nested enum named Type dosen't play well with the swift compiler. class A { class B { enum Type { case One case Two } let myC: Type init(myC: Type) { self.myC = myC } } func getB(myC: B.Type) -> B { return B(myC: myC) // ERROR 1 } } let a = A() let b = a.getB(.Two) // ERROR 2 The above code produces two errors: 'A.B.Type' is not convertible to 'A.B.Type' and 'A.B.Type.Type' does not have a member named 'Two' . The following cases does work: class B outside of class A let b = A.B(myC: .Two) enum

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have the following .proto file : enum Enum1{ X=0; Y=1; } message SomeClass{ required Enum1 enum1=1; required Enum2 enum2=2; } enum Enum2{ X=0; Z=1; } When I try to comile it using protoc , I get the following error : proto.proto:19:5: "X" is already defined proto.proto:19:5: Note that enum values use C++ scoping rules, meaning that enum values are siblings of their type, not children of it. Therefore, "X" must be unique , not just within "Enum2". I there any way I could overcome this issue ! 回答1: You could include your enum inside another

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I have written below code and it's compiling successfully. class Program { enum Fruits { Apple , Mango , Banana } static void Main ( string [] args ) { Fruits f = new Fruits (); } } Despite of Fruits being an enum , compiler and interpreter are allowing me to write this. Does this mean I can create a constructor for an enum? if yes then how? 回答1: No, you can't. new Fruits() will return the default value (the value corresponding to 0 in the underlying type of the enum), it's the same as default(Fruits) (or Fruits.Apple in your case)

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am creating an Immutable Linked List class in VBA. It provides ToArray and ToCollection methods, which I have both verified as working. However the Get NewEnum() As IUnknown property is not working and I don't know why. Public Property Get NewEnum() As IUnknown Attribute NewEnum.VB_UserMemId = -4 Set NewEnum = ToCollection.[_NewEnum] End Property Stepping through the following code with sequence as an SList with the debugger Public Function Copy(ByVal sequence As Variant) As SList Dim made As New SList Dim element As Variant For Each