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Search found 42001 results on 1681 pages for 'type theory'.

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• NSMutableArray with only a particular type of objects

  - by Leo

  Hello, is it possible to specify that a NSMutableArray can only contain a certain type of objects. For example, if I want to store only this kind of objects : @interface MyObject : NSObject { UInt8 value; } In order to be able to use the instance variable like this : - (void)myMethod:(NSMutableArray *)myArray{ for (id myObject in myArray){ [self otherMethod:myObject.value]; } } because I'm getting this error : request for member 'value' in something not a structure or union Thank you for your help

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• Java spring framework - how to set content type?

  - by Jon morgan

  Hi, I have a spring action that I am rendering some json from the controller, at the minute its returning the content type 'text/plain;charset=ISO-8859-1'. How can I change this to be 'application/json'? Thanks Jon

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• Determining credit/debit card type

  - by ct2k7

  Hi, I'm writing a POS application for the iPhone/iPod combination, using the same exact hardware used in Apple Stores:: EasyPay. Ok, my hurdle is this: how do I identify which credit card type is being used as text is entered in the uitextfield? I assume I've to use textField:shouldChangeCharactersInRange:replacementString:? However, I've got ideas floating around, but I simple cannot put them together to form code :/ Any help is appreciated! Thanks in advanced :D

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• Remove Specific Type of Children from Grid Control

  - by Asim Sajjad

  I wan to remove suppose control whose type is of border, from the grid control. how can I achieve it in WPF C# ?

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• .NET - create instance of each type that implements specific interface

  - by Feryt

  Hi. I have interface IModule and several classes that implements it. In test i need to create instance of each type(class) implementing that interface. Is is possible(with StructureMap)?

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• Getting name and type of a struct field from its object

  - by Aamir

  For example, I have a struct which is something like this: struct Test { int i; float f; char ch[10]; }; And I have an object of this struct such as: Test obj; Now, I want to programmatically get the field names and type of obj. Is it possible? This is C++ BTW.

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• Detecting type of webservice in httpmodule

  - by Marcus

  Hi, Is there any way to detect the type of a webservice inside a httpmodule? The reason for this is that I want to do some property injection to the webservice before it's processed. I found this: http://social.msdn.microsoft.com/Forums/en/asmxandxml/thread/0e848eee-d353-4e67-b47f-89fddb600009 but that is one h..l of an ugly solution. Anyone have a nice solution?

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• Postgres 8.3: "ERROR: cached plan must not change result type"

  - by Jin Kim

  This exception is being thrown by the PostgreSQL 8.3 server to my application. Does anyone know what this error means and what I can do about it? ERROR: cached plan must not change result type STATEMENT: select code,is_deprecated from country where code=$1

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• Custom field type:problem in page layout

  - by AB

  I have created a custom field type and its working properly but when I am adding it on page layout ,its not displaying any data in there.I am getting data from one of the list.I have added that field in list and its displaying all the data I want to select but on page layout its blank..... Any idea where i m getting wrong...?

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• Ctor not allowed return type.

  - by atch

  Having code: struct B { int* a; B(int value):a(new int(value)) { } B():a(nullptr){} B(const B&); } B::B(const B& pattern) { } I'm getting err msg: 'Error 1 error C2533: 'B::{ctor}' : constructors not allowed a return type' Any idea why? P.S. I'm using VS 2010RC

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• Adding reference to Office library failing: type or namespace name Word not found

  - by Dave

  I'm trying to use the sample code here: I went to "Add Reference" dialog and added "Microsoft Word 12 library", but it doesn't appear in the Solution Explorer. I also added: using Microsoft.Office; I get the following error message when trying to declare a "Word" object. Error 1: The type or namespace name 'Word' could not be found (are you missing a using directive or an assembly reference?) Any suggestions on how to properly reference the Word library?

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• Drupal: re-use same CCK Field in the same content type

  - by Patrick

  hi, I need a sequence of text, image, video CCK fields, repeated twice in my content type. I need to create 2 different groups (I don't want to use multi-upload functionality). I was wondering if I have to create a new field Image - File Upload for the second group, or I can somehow to re-use the first one (which is already added, and I would like to add it twice in the second group as well). thanks

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• Questions about .NET CollectionEditor type

  - by smwikipedia

  Who can tell me the internal working mechanism of a CollectionEditor in plain English? I have implemented every virtual function and step into each of them. Still got no clue of its intended algorithm. I searched the web and found tons of compaints about the CollectionEditor type, and even bugs. I am kind of thinking of the CollectionEditor as a total mess.

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• Detecting type of webserive in httpmodule

  - by Marcus

  Hi, Is there any way to detect the type of a webservice inside a httpmodule? The reason for this is that I want to do some property injection to the webservice before it's processed. I found this: http://social.msdn.microsoft.com/Forums/en/asmxandxml/thread/0e848eee-d353-4e67-b47f-89fddb600009 but that is one h..l of an ugly solution. Anyone have a nice solution?

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• Detect variance on generic type parameters of interfaces

  - by Water Cooler v2

  Is there a way to reflect on an interface to detect variance on its generic type parameters and return types? In other words, can I use reflection to differentiate between the two interfaces: interface IVariant<out R, in A> { R DoSomething(A arg); } interface IInvariant<R, A> { R DoSomething(A arg); } The IL for both looks the same.

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• Table per Type Inhertiance and Data Genertion Plans

  - by CodeGrue

  I have an Entity Framework model using Table per Type Inheritance, but when I use a VS Data Generation Plan it produces duplicate keys in the child tables, which is a problem for EF. Does anyone know of a way to get this to work, so that the child tables do not have overlapping keys?

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• Most common applications of the C# 4.0 dynamic type

  - by David Neale

  Now that people have been using C# 4.0 for a while I thought I'd see how people were most often using the type 'dynamic' and why has this helped them solve their problem better than they may have done previously?

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• Template function in C# - Return Type?

  - by LifeH2O

  It seems that c# does not support c++ like templates. template <class myType> myType GetMax (myType a, myType b) { return (a>b?a:b); } I want my function to have return type based on its parameters, how can i achieve this in c#? How to use templates in C#

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• Detect network connection type on Android

  - by hgpc

  How do you detect the network connection type on Android? Is it through ConnectivityManager.getActiveNetworkInfo().getType(), and the answer is limited to Wifi and mobile?

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• what's Static type safety ?

  - by symfony

  Static type safety – an integral property of languages of the family to which C++ belongs and valuable both for guaranteeing properties of a design and for providing runtime and space efficiency. Can someone illustrate by a demo? Thanks

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• Postgresql 9.1: ERROR: type "citext" does not exist

  - by gotuskar

  I am trying to execute following query through PgAdmin utility. CREATE TABLE svcr."EventLogs" ("eventId" BIGINT NOT NULL, "eventTime" TIMESTAMP WITH TIME ZONE NOT NULL, "userid" CITEXT, "realmid" CITEXT NOT NULL, "onUserid" CITEXT, "description" TEXT, CONSTRAINT eventlogs_pkey PRIMARY KEY ("eventId")); And I get following error - ERROR: type "citext" does not exist SQL state: 42704 Character: 120 However, following query runs fine - CREATE TABLE svcr."CategoryMap" ("category" INT NOT NULL, "userData" INT NOT NULL); What is wrong with the first query?

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• Check for type of file system in an MSI package

  - by Hugo

  In my MSI package I need to set user rights to a directory using cacls.exe. It works fine in an NTFS environment but fails when run on a Fat32 file system. Is there a method to determine the type of file system of the drive the software is installed to? I'm using WiX 3 to create my MSI package but any hint pointing to the MSI database would help as well. Many thanks in advance.

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• Better way to ignore exception type: multiple catch block vs. type querying

  - by HuBeZa

  There are situations that we like to ignore a specific exception type (commonly ObjectDisposedException). It can be achieved with those two methods: try { // code that throws error here: } catch (SpecificException) { /*ignore this*/ } catch (Exception ex) { // Handle exception, write to log... } or try { // code that throws error here: } catch (Exception ex) { if (ex is SpecificException) { /*ignore this*/ } else { // Handle exception, write to log... } } What are the pros and cons of this two methods (regarding performance, readability, etc.)?

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• implementing java interface with scala class - type issue

  - by paintcan

  Why on earth won't this compile? Scala 2.8.0RC3: Java public interface X { void logClick(long ts, int cId, String s, double c); } Scala class Y extends X { def logClick(ts: Long, cId: Int,sid: java.lang.String,c: Double) : Unit = { ... } } Error class Y needs to be abstract, since method logClick in trait X of type (ts: Long,cId: Int,s: java.lang.String,c: Double)Unit is not defined

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• Grails/Hibernate max for string type

  - by bsreekanth

  Hello, In my table I have a serial number field, which is represneted by string.. It has a prefix and some numbers follow. Eg: ABC1234, ABC2345 etc. How to retrieve the largest value (max equivalent of int type) from this column. In my case it would be ABC2345. I probably could retrieve all the data,, sort it and get the same, but that would be slow. thanks in advance..

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