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 was typing a switch with an enum in VS 2013 and all case statements filled out automatically after I finished the switch. Now I can't repeat it. I was not hallucinating, the switch filled out with all enum options, one per case, automatically. Looked through MS docs for VS 2013 and didn't find it. I use quite a few enums and this feature will save me a ton of time if I can find what it is I did to trigger it. Can anyone help? 回答1: Use the code snipped sw(tab)(tab) Hope this helps, 回答2: Notice: This answer applies to performing the switch

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 my MySQL database, there's the column "gender enum('male','female')" I've created my enum "com.mydomain.myapp.enums.Gender", and in my Person entity I'm defined "Gender gender". Now I'd want to keep the enum type in my MySQL database, but when I launch my application I get: Wrong column type in MyApp.Person for column Gender. Found: enum, expected: integer Why is this? This would be the equivalent as if I'd annotated my "Gender gender" with "@Enumerated(EnumType.ORDINAL)", which I haven't. EnumType seems only to be able to be either

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: How should bit fields be declared and used in Swift? Declaring an enum like this does work, but trying to OR 2 values together fails to compile: enum MyEnum: Int { case One = 0x01 case Two = 0x02 case Four = 0x04 case Eight = 0x08 } // This works as expected let m1: MyEnum = .One // Compiler error: "Could not find an overload for '|' that accepts the supplied arguments" let combined: MyEnum = MyEnum.One | MyEnum.Four I looked at how Swift imports Foundation enum types, and it does so by defining a struct that conforms to the RawOptionSet

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: It recently occured to me that the following (sample) enumeration... enum Color { Red , Green , Yellow , Blue } ... could be replaced with a seemingly more type-safe class: class Color { private Color () { } public static readonly Color Red = new Color (); public static readonly Color Green = new Color (); public static readonly Color Yellow = new Color (); public static readonly Color Blue = new Color (); } With "type-safe", I mean that the following statement would work if Color was an enum, but not if Color were the above class:

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 a basic enum declaration: enum Title {Prof, Dr, Mr, Mdm, Mrs, Miss, NA}; I'm trying to map the user input(0,1,2,3,4,5,AnyNumber) with correct value from enum like this: std::map<std::string,Title> m; m["0"] = Prof; m["1"] = Dr; m["2"] = Mr; m["3"] = Mdm; m["4"] = Mrs; m["5"] = Miss; std::string stitle; cout << "\n" << "Title (0:Prof 1:Dr 2:Mr 3:Mdm 4:Mrs 5:Miss Any:NA): "; cin >> stitle; Title title = m[stitle]; cout << title; // output 1 when I input 1, output 2 when I input 2 and so on I expect the above code should be working but

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 a Vote class and one of the properties it can have is a vote type. Such as unanimous, a 3/4 vote, a simply majority, etc. Each type needs to have a string associated with it which will describe the vote type (like "A simply majority requires 51% to pass" etc.). I need to pass these vote types/description in with my view model to my view and then I can make my drop down list with it. Then, when the form that creates the vote is submitted I just need to bind the vote type (without description) to the Vote model (which is part of the

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 was browsing some Route netlink source code. I wanted to figure out what was the value of RTNLGRP_NEIGH Source: http://lxr.free-electrons.com/source/include/linux/rtnetlink.h?v=2.6.35#L550 541 /* RTnetlink multicast groups */ 542 enum rtnetlink_groups { 543 RTNLGRP_NONE, 544 #define RTNLGRP_NONE RTNLGRP_NONE 545 RTNLGRP_LINK, 546 #define RTNLGRP_LINK RTNLGRP_LINK 547 RTNLGRP_NOTIFY, 548 #define RTNLGRP_NOTIFY RTNLGRP_NOTIFY 549 RTNLGRP_NEIGH, 550 #define RTNLGRP_NEIGH RTNLGRP_NEIGH 551 RTNLGRP_TC, 552 #define RTNLGRP_TC RTNLGRP_TC 553

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: Consider: enum Test { a = 3, b = 7, c = 1 }; I want to access the enum using an index. Something like this: for (i=0; i<n; i++) doSomething((Test)i); How can I do something like this, where I will be able to access the enum using an index, though the members of the enum have different values? 回答1: This is the best you can do: enum Test { a = 3, b = 7, c = 1, LAST = -1 }; static const enum Test Test_map[] = { a, b, c, LAST }; for (int i = 0; Test_map[i] != LAST; i++) doSomething(Test_map[i]); You have to maintain the mapping yourself. 回答2:

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 enum like the one below, but eclipse says that there are errors in the first definition of each opposite pair. public enum Baz{ yin(yang), //Cannot reference a field before it is defined yang(yin), good(evil), //Cannot reference a field before it is defined evil(good); public final Baz opposite; Baz(Baz opposite){ this.opposite = opposite; } } What I want to accomplish is being able to use Baz.something.opposite to get the opposite object of Baz.something . Is there a possible workaround for this? Maybe an empty placeholder for

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 application.properties with a property: custom.property=test I have a field in the class: @Value("${custom.property}") protected Property property; I have an enum: public enum Property { A, AB, ABC, ABCD, ABCDE; } When I'm running application with a custom.property=abc (lower case) I have an error: Cannot convert value of type [java.lang.String] to required type [com.blabla.domain.enums.Property]: no matching editors or conversion strategy found. custom.property=ABC (upper case) Works fine. Is there a way to bind the value case