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Search found 1868 results on 75 pages for 'cast'.

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• C++: Can virtual inheritance be detected at compile time?

  - by Tim

  I would like to determine at compile time if a pointer to Derived can be cast from a pointer to Base without dynamic_cast<. Is this possible using templates and metaprogramming? This isn't exactly the same problem as determining if Base is a virtual base class of Derived, because Base could be the super class of a virtual base class of Derived. Thanks, Tim

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• How do I convert the Cookies collection to a generic list? Easily

  - by Naeem Sarfraz

  Anyone know how I can convert Request.Cookies into a List<HttpCookie>? The following didn't work as it throws an exception. List<HttpCookie> lstCookies = new List<HttpCookie>( Request.Cookies.Cast<HttpCookie>());

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• Loading and saving a class to a binary file

  - by user146780

  I don't know if this is possible but, I have a class and I'v made an instance of it. I also put things in it. It has vectors and other things. I was wondering if I could save its contents (the instance) to a binary file, then reload it and cast it in from the file. Thanks

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• Java; casting base class to derived class

  - by incrediman

  Why can't I cast a base class instance to a derived class? For example, if I have a class B which extends a class C, why can't I do this? B b=(B)(new C()); or this? C c=new C(); B b=(B)c;

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• mapping Field with variable type using Hibernate Annotaion

  - by Zahra

  Hi. how can I have a field with variable type in my class? I use hibernate annotation for mapping to DB. I tried to use java.io.Serializable as field's type, but it mapped to database as a 01 amount which is true if I get it's object and cast it to it's true type. but I need to run a query on this objects that needs true amount of field.(right now I can't compare an integer field with a number) Does anyone have any idea how can I do this? Thanks in advance.

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• Getting following warning while compiling

  - by thetna

  warning: passing argument 1 of 'bsearch' makes pointer from integer without a cast and the corresponding code is Parent =bsearch((const size_t)ParentNum, ClauseVector, Size, sizeof(CLAUSE),pcheck_CompareNumberAndClause); the compilar is gcc. here CLAUSE is defined as *CLAUSE.

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• Converting contents of HtmlTextWriter to a string

  - by Tony_Henrich

  I have a third party tool that creates an img tag through code using HtmlTextWriter's RenderBeginTag, RenderEndTag & AddAttribute methods. I want to get the resulting HTML into a string. I tried the reflection method mentioned here but I get a error "Unable to cast object of type 'System.Web.HttpWriter' to type 'System.IO.StringWriter". The InnerWriter type of the HtmlTextWriter is of type HttpWriter. Any ideas on how to copy the output html into a string?

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• Converting 'x' value of a CGPoint ivar to NSTimeInterval?

  - by eco_bach

  Hi I have a velocity ivar defined as a CGPoint. I need to somehow extract just the 'x' value of velocity, and then use this to call-send a message to the following method signature -(void) adjustTimer:(NSTimeInterval*)newInterval How do I obtain just the 'x' value of a CGPoint? Do I then need to convert or cast this result before calling my adjustTimer method?

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• Type problem with Observable.Create from Boo

  - by Tristan

  I'm trying to use Reactive Extensions from Boo and am running into type problems. Here's the basic example: def OnSubscribe(observer as IObservable[of string]) as callable: print "subscribing" def Dispose(): print "disposing" return Dispose observable = System.Linq.Observable.Create[of string](OnSubscribe) observer = System.Linq.Observer.Create[of string]({x as string | print x}) observable.Subscribe(observer) The Subscribe here gives a System.InvalidCastException: Cannot cast from source type to destination type. The issue appears to be with how I'm creating the observable, but I've struggled to see where the type problem arises from. Ideas?

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• Help with data retrieval MACRO

  - by Andrei Ciobanu

  Hello, given the following structure: struct nmslist_elem_s { nmptr data; struct nmslist_elem_s *next; }; typedef struct nmslist_elem_s nmslist_elem; Where: typedef void* nmptr; Is it possible to write a MACRO that retrieves the data from the element and cast it to the right type: MACRO(type, element) that expands to *((type*)element->data). For example for int, i would need something like this: *((int*)(element->data)) .

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• Most optimal way to convert to date

  - by IMHO

  I have legacy system where all date fields are maintained in YMD format. Example: 20101123 this is date: 11/23/2010 I'm looking for most optimal way to convert from number to date field. Here is what I came up with: declare @ymd int set @ymd = 20101122 select @ymd, convert(datetime, cast(@ymd as varchar(100)), 112) This is pretty good solution but I'm wandering if someone has better way doing it

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• What are the reasons for casting a void pointer?

  - by Maulrus

  I'm learning C++ from scratch, and as such I don't have an expert understanding of C. In C++, you can't cast a void pointer to whatever, and I understand the reasons behind that. However, I know that in C, you can. What are the possible reasons for this? It just seems like it's be a huge hole in type safety, which (to me) seems like a bad thing.

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• How to find out if an object is of <type> or a decendant of <type>

  - by Vaccano

  I have the following code: foreach (var control in this.Controls) { } I want to do something like control.Hide() in there. But the items in the this.Controls collection are not of type Control (they are Object). I can't seem to remember the safe way to cast this to call hide if it is really of type Control and do nothing otherwise. (I am a transplanted delphi programmer and I keep thinking something like control is Control.)

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• How to record user interaction in Flash app?

  - by Trung Vu

  I am looking for a way to capture the user interactions with a text input control in Flash over a period of time (not a screen cast)? For example: If the user enter some text, then delete, then enter something, I would be able to store that interaction as it happens and replay that later. Any help would be extremely useful Thanks

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• Java method get the inheriting type

  - by DrDro

  I have several classes that extend C and I would need a method that accepts any argument of type C. But in this method I would like to know if I'm dealing with A or B. * public A extends C public B extends C public void goForIt(C c)() If I cast how can I retrieve the type in a clean way (I just read using getClass or instanceof is often not the best way). PS: Fell free to edit an explicit title. *Sorry but I can't type closing braces

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• Ado.net entity model problem

  - by ognjenb

  public ActionResult Index() { using (testEntities korisnici = new testEntities()) { my_aspnet_users user = new my_aspnet_users(); user = from i in korisnici.my_aspnet_users select i; return View(user); } } Error: Cannot implicitly convert type 'System.Linq.IQueryable' to 'MyApp.Models.my_aspnet_users'. An explicit conversion exists (are you missing a cast?)

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• Why do you have to mark a class with the attribute [serializable] ?

  - by Blankman

  Seeing as you can convert any document to a byte array and save it to disk, and then rebuild the file to its original form (as long as you have meta data for its filename etc.). Why do you have to mark a class with [Serializable] etc? Is that just the same idea, "meta data" type information so when you cast the object to its class things are mapped properly?

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• Sum function doesn't work :/

  - by StackedCrooked

  A while ago this code seemed to work, but now it doesn't anymore. Is there something wrong with it? user=> (defn sum [a b] (a + b)) #'user/sum user=> (sum 3 4) java.lang.ClassCastException: java.lang.Integer cannot be cast to clojure.lang.IFn (NO_SOURCE_FILE:0) user=> It's probably time to take a break :)

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• sql - get the latest date of two columns

  - by stacker

  table1 - date1 datetime not null - date2 nvarchar null I want to get the latest date of this two. select date1, date2, (CASE WHEN date1 > CAST(date2 as DateTime) THEN date1 ELSE date2 END) as DateTime) as LatestDate from table1 please note that date2 can be null. in this case, date1 win.

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• Java method: retrieve the inheriting type

  - by DrDro

  I have several classes that extend C and I would need a method that accepts any argument of type C. But in this method I would like to know if I'm dealing with A or B. * public A extends C public B extends C public void goForIt(C c)() If I cast how can I retrieve the type in a clean way (I just read using getClass or instanceof is often not the best way). *Sorry but I can't type closing braces

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• Does casting an IList<T> to an array of type T[] cause enumeration?

  - by Brian Triplett

  I have a method that looks like: T[] field; public Method(IList<T> argument) { this.field = (T[])argument; } When the body of the method is executed does enumeration take place during the cast? Would that change if the underlying type was different?

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• Silverlight Custom TabItem?

  - by PlayKid

  Hi all, I tried to create a custom tabitem on Silverlight, but when i run it, it's complaining Unable to cast CustomTab to TabItem. I am not sure how to fix that, any idea? Thanks alot

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• Parse multiple filters in SQL

  - by Jeff Meatball Yang

  I have a problem parsing a stored procedure parameter in the form: declare @S varchar(100) set @S = '4=2,24=1534' Here's the query: select cast(idx as varchar(100)) 'idx' , value , SUBSTRING(value, 1, charindex(value, '=')+1) 'first' , SUBSTRING(value, charindex(value, '=')+1, LEN(value)-charindex(value, '=')-1) 'second' from Common.SplitToTable(@S, ',') -- returns (idx int, value varchar(max)) where len(value) > 0 But here is the result I get: idx value first second 0 4=2 4 4= 1 24=1534 2 24=153 Here's what I expected: idx value first second 0 4=2 4 2 1 24=1534 2 1534 Help?

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• Char and Chr in Delphi

  - by JamesB

  The difference between Chr and Char when used in converting types is that one is a function and the other is cast So: Char(66) = Chr(66) I don't think there is any performance difference (at least I've never noticed any, one probably calls the other).... I'm fairly sure someone will correct me on this! Which do you use in your code and why?

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• How to maintain precision using DateTime.Now.Ticks in C#

  - by nmr

  I know that when I use DateTime.Now.Ticks in C# it returns a long value but I need to store it in an int variable and I am confused as to whether or not I can maintain that precision. As of right now I just have a cast int timeStampValue = (int)DateTime.Now.Ticks; Any suggestions or advice on how to maintain the precision, if possible, would be much appreciated.

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