indexer

Eclipse has two C/C++ indexers (fast & full): what's the difference?

由 坚强是说给别人听的谎言 提交于 2019-11-28 02:48:08
问题 Eclipse CDT provides two indexers for C/C++ code (Preferences > C/C++ > Indexer). Does anybody know what the exact difference is between these two? The help file isn't exactly enlightening: "CDT supports the contribution of additional indexers, with 2 indexers being provided with the default CDT release: Fast C/C++ Indexer : provides fastest indexing capabilities - both declarations and cross reference information. This is the recommended indexer. Full C/C++ Indexer : provides even more

wpf bind to indexer

由 ╄→гoц情女王★ 提交于 2019-11-27 22:56:10
<TextBlock Text="{Binding Path=[0]} /> or <TextBlock Text="{Binding Path=[myKey]} /> works fine. But is there a way to pass a variable as indexer key? <TextBlock Text="{Binding Path=[{Binding Column.Index}]} /> The quickest way to handle this is usually to use a MultiBinding with an IMultiValueConverter that accepts the collection and the index for its bindings: <TextBlock.Text> <MultiBinding Converter="{StaticResource ListIndexToValueConverter}"> <Binding /> <!-- assuming the collection is the DataContext --> <Binding Path="Column.Index"/> </MultiBinding> </TextBlock.Text> The converter can

PropertyChanged for indexer property

由 怎甘沉沦 提交于 2019-11-27 18:31:10
I have a class with an indexer property, with a string key: public class IndexerProvider { public object this[string key] { get { return ... } set { ... } } ... } I bind to an instance of this class in WPF, using indexer notation: <TextBox Text="{Binding [IndexerKeyThingy]}"> That works fine, but I want to raise a PropertyChanged event when one of the indexer values changes. I tried raising it with a property name of "[keyname]" (i.e. including [] around the name of the key), but that doesn't seem to work. I don't get binding errors in my output window whatsoever. I can't use

Implementing an indexer in a class in TypeScript

由 可紊 提交于 2019-11-27 17:12:50
问题 Is it currently possible to implement an indexer on a class in TypeScript? class MyCollection { [name: string]: MyType; } This doesn't compile. I can specify an indexer on an interface, of course, but I need methods on this type as well as the indexer, so an interface won't suffice. Thanks. 回答1: You cannot implement a class with an indexer. You can create an interface, but that interface cannot be implemented by a class. It can be implemented in plain JavaScript, and you can specify functions

Why doesn't Array class expose its indexer directly?

由 好久不见. 提交于 2019-11-27 15:44:06
问题 something to mention for answering: Don't worry about variance , while the item in question is Array rather than T[] . A similar case for multi-dimension arrays is [here] That is, N-dims to linear transform, is always possible. So this question especially caught my attention, since it already implemented IList for a linear indexer. Question: In my code, I have following declaration: public static Array ToArray<T>(this T source); My code knows how to make souce presents an array(at runtime).

Android: how to use SectionIndexer

由 安稳与你 提交于 2019-11-27 14:00:29
问题 I am trying to find a way to use SectionIndexer , instead of AlphabetIndexer . What I am interested to do is to have elements of a string arrays on the section headers instead of alphabets. I have not been able to find any sample code using section indexer. Here is a sample code for AlphabetIndexer : private AlphabetIndexer indexer; indexer = new AlphabetIndexer(c, c.getColumnIndexOrThrow( DbHelper.COUNTRIES_NAME),"ABCDEFGHIJKLMNOPQRSTUVWXYZ"); Is it possible to pass a stringArray instead of

Real world use cases for C# indexers?

由 我是研究僧i 提交于 2019-11-27 04:13:44
问题 I've seen lot of examples for c# Indexers, but in what way will it help me in real life situations. I know the C# guru wouldn't have added this if it wasn't a serious feature, but i cant think of a real world situation (not the foo bar stuff) to use indexers. Note:I realize a related question exists, but it doesn't help me much. 回答1: The way I look at indexers is that (rightly or wrongly!), accessing something by index should be more efficient than accessing it any other way, because in some

When should you use C# indexers?

由 廉价感情. 提交于 2019-11-27 03:50:49
问题 I'd like to use indexers more, but I'm not sure when to use them. All I've found online are examples that use classes like MyClass and IndexerClass . What about in a school system where there are Students and Teachers, and each Teacher has a list of Students that they're in charge of - any need for indexers in that scenario? For simplicity's sake: each Student can only belong to one Teacher. 回答1: Indexer is a highly specialized property which allows instances of a class (or struct) to be

Class with indexer and property named “Item”

由 依然范特西╮ 提交于 2019-11-26 20:45:35
Is it possible to create a class in .NET 4 with: an indexer, a property named "Item"? For example, this C# class will not compile for me: public class MyClass { public object Item { get; set; } public object this[string index] { get { return null; } set { } } } The compiler gives an error CS0102 : The type 'MyClass' already contains a definition for 'Item' although I am only explicitly defining Item once. Based on this site , it is possible to use an attribute to rename the Indexer public class MyClass { public object Item { get; set; } [System.Runtime.CompilerServices.IndexerName("MyItem")]

Static Indexers?

由 僤鯓⒐⒋嵵緔 提交于 2019-11-26 17:33:29
Why are static indexers disallowed in C#? I see no reason why they should not be allowed and furthermore they could be very useful. For example: public static class ConfigurationManager { public object this[string name] { get => ConfigurationManager.getProperty(name); set => ConfigurationManager.editProperty(name, value); } /// <summary> /// This will write the value to the property. Will overwrite if the property is already there /// </summary> /// <param name="name">Name of the property</param> /// <param name="value">Value to be wrote (calls ToString)</param> public static void editProperty
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