Search Results

Search found 101527 results on 4062 pages for 'user defined types'.

Page 288/4062 | < Previous Page | 284 285 286 287 288 289 290 291 292 293 294 295  | Next Page >

• How to create a container that holds different types of function pointers in C++?

  - by Alex

  I'm doing a linear genetic programming project, where programs are bred and evolved by means of natural evolution mechanisms. Their "DNA" is basically a container (I've used arrays and vectors successfully) which contain function pointers to a set of functions available. Now, for simple problems, such as mathematical problems, I could use one type-defined function pointer which could point to functions that all return a double and all take as parameters two doubles. Unfortunately this is not very practical. I need to be able to have a container which can have different sorts of function pointers, say a function pointer to a function which takes no arguments, or a function which takes one argument, or a function which returns something, etc (you get the idea)... Is there any way to do this using any kind of container ? Could I do that using a container which contains polymorphic classes, which in their turn have various kinds of function pointers? I hope someone can direct me towards a solution because redesigning everything I've done so far is going to be painful.

  Read the article

• Can the behaviour of new HTML5 form types be overridden?

  - by Mark Perkins

  I was wondering if anyone knew if it were possible to override the default behaviour of browsers that support the new HTML input types such as type="email" and type="date"? I appreciate that I could test if a browser supports an input type and provide a fallback for those browsers that don't, but what I want to know is is there any way to prevent that default behaviour from happening in browsers that do support it? For instance, if in Opera I want to use the date input type, but I don't want Opera to display the native datepicker (i.e. I want to replace it with my own custom one) is that possible? Are there any DOM events triggered like onDatePickerShow that one can hook into? I don't believe that this is possible, but if anyone knows for sure one way or the other I would love to hear from you.

  Read the article

• SSIS - How do I see/set the field types in a Recordset?

  - by thursdaysgeek

  I'm looking at an inherited SSIS package, and a stored procedure is sending records to a recordset called USER:NEW_RECORDS. It's of type Object, and the value is System.Object. It is then used for inputting that data to a SQL table. We're getting an error, because it seems that the numeric results of the stored procedure are being put in a DT_WSTR field, and then failing when it is then put into a decimal field in the database. Most of the records are working, but one, which happens to have a longer number of decimal digits, is failing. I want to see exactly what my SSIS recordset field types are, and probably change them, so I can force the data to be truncated properly and copied. Or, perhaps, I'm not even looking at this correctly. The data is put into the recordset using a SQL Task that executes the stored procedure.

  Read the article

• What is the basic design idea behind the Scala for-loop implicit box/unboxing of numerical types?

  - by IODEV

  I'm trying to understand the behavior of Scala for-loop implicit box/unboxing of "numerical" types. Why does the two first fail but not the rest? 1) Fails: scala for (i:Long <- 0 to 10000000L) {} <console>:19: error: type mismatch;<br> found : Long(10000000L) required: Int for (i:Long <- 0 to 10000000L) {} ^ 2 Fails: scala for (i <- 0 to 10000000L) {} <console>:19: error: type mismatch; found : Long(10000000L) required: Int for (i <- 0 to 10000000L) {} ^ 3) Works: scala for (i:Long <- 0L to 10000000L) {} 4) Works: scala for (i <- 0L to 10000000L) {}

  Read the article

• Saving Types generated via Reflection.Emit as code file (.cs) instead of saving it in .dll files

  - by Manish Sinha

  Before start let me tell my experience: I am experienced with C#.NET, web services, XML part and few more. Reflection is something new to me, though I have read extensively on it and tried out some experimental code, but haven't made anything great using reflection I checked out many examples of how we can create Type at runtime and then which can be saved in an assembly (.dll) files. Of all the examples I have seen is about saving the created types in the .dll files instead of code file. Isn't there any way to create the code file out of reflection? I need to create code file since I want to distribute code instead of compiled assemblies. What I want to do is something like xsd.exe does, either spit out a .dll or the code file(in any language). Isn't there any way to create a code file, since most of the place I can find is AssemblyBuilder ab = System.AppDomain.CurrentDomain.DefineDynamicAssembly(an, AssemblyBuilderAccess.Save); and then lastly ab.Save("QuoteOfTheDay.dll");

  Read the article

• Everytime user types , in my text box i want it to become ',' or help me do it using a parameter

  - by MyHeadHurts

  I am using a vb.net textbox to become part of my IN sql statement in my program I tryed to use a parameter and it didn't work here is my code TextBox1.Text = "'Cruises','Caribbean and Mexico','CentralSouth America', 'Europe','Far East','France','Italy','London/UK','Middle East/Africa','South Pacific','Spain/Portugal','USA/Canada'" the default value of my textbox although the user can edit the textbox, but they would need to type the ',' which i would rather them just type , . and my other code is If RadioButtonList1.SelectedValue = "Sales" And CheckBox1.Checked = False Then 'saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, dbo.B605SaleAsOfAdvancedMaster.AsOFSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, dbo.B605SaleAsOfAdvancedMaster.YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, dbo.B604SalesAsOfAdvanced.Sales AS CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =" & DropDownList1.SelectedValue & ") AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) order by B605SaleAsOfAdvancedMaster.SDESCR" saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, dbo.B605SaleAsOfAdvancedMaster.AsOFSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, dbo.B605SaleAsOfAdvancedMaster.YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, dbo.B604SalesAsOfAdvanced.Sales AS CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in ('Cruises','Caribbean and Mexico','CentralSouth America', 'Europe','Far East','France','Italy','London/UK','Middle East/Africa','South Pacific','Spain/Portugal','USA/Canada') order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Sales" ElseIf RadioButtonList1.SelectedValue = "NetSales" And CheckBox1.Checked = False Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, (ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFNET,0) + (ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFOther,0))) as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, (ISNULL(dbo.B605SaleAsOfAdvancedMaster.YENET,0) + (ISNULL(dbo.B605SaleAsOfAdvancedMaster.YEOther,0))) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, (ISNULL(dbo.B604SalesAsOfAdvanced.netSales,0) + (ISNULL(dbo.B604SalesAsOfAdvanced.OtherSales,0))) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in ('Cruises','Caribbean and Mexico','CentralSouth America', 'Europe','Far East','France','Italy','London/UK','Middle East/Africa','South Pacific','Spain/Portugal','USA/Canada') order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Net Sales" ElseIf RadioButtonList1.SelectedValue = "INSSales" And CheckBox1.Checked = False Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFINS,0)as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, ISNULL(dbo.B605SaleAsOfAdvancedMaster.YEINS,0) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, ISNULL(dbo.B604SalesAsOfAdvanced.INSSales,0) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in ('Cruises','Caribbean and Mexico','CentralSouth America', 'Europe','Far East','France','Italy','London/UK','Middle East/Africa','South Pacific','Spain/Portugal','USA/Canada') order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Insurance Sales" ElseIf RadioButtonList1.SelectedValue = "CXSales" And CheckBox1.Checked = False Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFCX,0)as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, ISNULL(dbo.B605SaleAsOfAdvancedMaster.YECX,0) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, ISNULL(dbo.B604SalesAsOfAdvanced.CXSales,0) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in ('Cruises','Caribbean and Mexico','CentralSouth America', 'Europe','Far East','France','Italy','London/UK','Middle East/Africa','South Pacific','Spain/Portugal','USA/Canada') order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Canceled Sales" ElseIf RadioButtonList1.SelectedValue = "Sales" And CheckBox1.Checked = True Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, dbo.B605SaleAsOfAdvancedMaster.AsOFSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, dbo.B605SaleAsOfAdvancedMaster.YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, dbo.B604SalesAsOfAdvanced.Sales AS CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in (" & TextBox1.Text & ") order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Sales" ElseIf RadioButtonList1.SelectedValue = "NetSales" And CheckBox1.Checked = True Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, (ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFNET,0) + (ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFOther,0))) as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, (ISNULL(dbo.B605SaleAsOfAdvancedMaster.YENET,0) + (ISNULL(dbo.B605SaleAsOfAdvancedMaster.YEOther,0))) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, (ISNULL(dbo.B604SalesAsOfAdvanced.netSales,0) + (ISNULL(dbo.B604SalesAsOfAdvanced.OtherSales,0))) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in (" & TextBox1.Text & ") order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Net Sales" ElseIf RadioButtonList1.SelectedValue = "INSSales" And CheckBox1.Checked = True Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFINS,0)as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, ISNULL(dbo.B605SaleAsOfAdvancedMaster.YEINS,0) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, ISNULL(dbo.B604SalesAsOfAdvanced.INSSales,0) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in (" & TextBox1.Text & ") order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Insurance Sales" ElseIf RadioButtonList1.SelectedValue = "CXSales" And CheckBox1.Checked = True Then saocmd1.CommandText = "SELECT dbo.B605SaleAsOfAdvancedMaster.SDESCR, dbo.B605SaleAsOfAdvancedMaster.DYYYY, ISNULL(dbo.B605SaleAsOfAdvancedMaster.AsOFCX,0)as AsofSales, dbo.B605SaleAsOfAdvancedMaster.ASOFPAX, ISNULL(dbo.B605SaleAsOfAdvancedMaster.YECX,0) as YESales, dbo.B605SaleAsOfAdvancedMaster.YEPAX, ISNULL(dbo.B604SalesAsOfAdvanced.CXSales,0) as CurrentSales, dbo.B604SalesAsOfAdvanced.PAX AS CurrentPAX FROM B604SalesAsOfAdvanced INNER JOIN B605SaleAsOfAdvancedMaster ON dbo.B605SaleAsOfAdvancedMaster.SDESCR = B604SalesAsOfAdvanced.SDESCR WHERE (B605SaleAsOfAdvancedMaster.DYYYY =@Dyyyy) AND (B604SalesAsOfAdvanced.DYYYY = (DatePart(year, GetDate()) +1)) and dbo.B605SaleAsOfAdvancedMaster.SDESCR in (" & TextBox1.Text & ") order by B605SaleAsOfAdvancedMaster.SDESCR" Label2.Text = "Canceled Sales" End If Basically what is happening is, if a certain radio button is selected and the user didn't click the checkbox the default regions are included and they are hardcoded because the query runs much faster. if the user did click the checkbox then the textbox where they type the specific regions shows up and it will run the query that includes the dbo.B605SaleAsOfAdvancedMaster.SDESCR in (" & TextBox1.Text & ") If you can somehow do this using parameters and not with the textbox1.text in the query it will run much faster for me thanks for your help

  Read the article

• XNA Class Design with Structs as Properties and issues because they are value types and not referenc

  - by Nate Bross

  I'm wondering how you'd recommend designin a class, given the fact that XNA Framework uses Struct all over the place? For example, a spite class, which may require a Vector2 and a Rectangle (both defined as Struct) to be accessed outside of the class. The issue come in when you try to write code like this: class Item { public Vetor2 Position {get; set;} public Item() { Position = new Vector2(5,5); } } Item i = new Item(); i.Positon.X = 20; // fails with error 'Cannot modify the return value of Item because it is not a variable.' // you must write code like this var pos = i.Position; pos.X++; i.Position = pos; The second option compiles and works, but it is just butt ugly. Is there a better way?

  Read the article

• Why bother to limit the types imported from a python package?

  - by Fast Fish

  When using many IDEs that support autocompletion with Python, things like this will show warnings, which I find annoying: from eventlet.green.httplib import BadStatusLine When switching to: rom eventlet.green.httplib * The warnings go away. What's the benefit to limiting imports to a specific set of types you'll use? Is the parsing faster? Reduces collisions? What other point is there? It seems the state of python IDEs and the nature of the typing system makes it hard for many IDEs to fully get right when a type import works and when it doesn't.

  Read the article

• Visual Studio: How to override the default "Build Action" for certain extension types per project or solution?

  - by Lukasz Podolak

  I'm serving my asp.net mvc views from many assemblies and copying views to the main application on post-build event. This works, however, I realized, that when I change something in view and just hit F5, changes are not included. What I have to do to see changes is to: save, build<- explicitly clicking, and then hit F5. However, it's pretty annoying solution. I discovered that setting Build action to "Embedded Resource" on view solves the problem as well, however other devs may not remember that they have to do this after adding every view to the solution. Is there a way to override the default build action for certain file extensions, such as: *.aspx, *.ascx in project or (better) in solution ? What I've found is an ability to add this setting globally, per machine, but I do not want to do that (link: http://blog.andreloker.de/post/2010/07/02/Visual-Studio-default-build-action-for-non-default-file-types.aspx) Any ideas ?

  Read the article

• Why are types found on an imported namepace but not on a fully qualified namespace after retargeting the framework?

  - by Paul Ferguson

  We've just re-targeted a VB.NET project from .Net 2.0 to 3.5. Various framework types are now missing from our project. Wherever the type is referenced using a fully qualified namespace it's missing. If the relevant namespace is imported for the type; it's found. For example, this doesn't find the type Object, with compiler error "System.Object is not defined.": Public Class Foo Inherits System.Object End Class However, this works ok: Imports System Public Class Foo Inherits [Object] End Class I've already tried re-opening the solution with no success.

  Read the article

• Should GSON ignore varying types if they're not used in a class?

  - by loeschg

  I'm making an API call that returns JSON which has a particular field which either returns false or a map depending on content. It's a field that I don't care about. I expected GSON to ignore this particular field, though it doesn't seem to be. The object generation fails with the following message: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected a string but was BEGIN_OBJECT at line 1 column 403560 I've seen this particular question (Gson deserialize json with varying value types). I want to make sure I need to make a custom deserializer before doing so. I'm wondering if I may have another issue. edit: Example: "anonymous_flag": { } vs "anonymous_flag": "yes" Another Edit: I actually had the field in my model object... I was referencing the wrong class. Judge away :)

  Read the article

• How can I check the type of an object against a list of types?

  - by RookieRick

  Given a collection IEnumerable<Type> supportedTypes What's the best way to check whether a given object is one of those types (or a derived type)? My first instinct was to do something like: // object target is a parameter passed to the method in which I'm doing this. if (supportedTypes.Count( supportedType => target is supportedType ) > 0) { // Yay my object is of a supported type!!! } ..but that doesn't seem to be working. Can I not use the "is" keyword in a lambda expression like this?

  Read the article

• How to accomplish covariant return types when returning a shared_ptr?

  - by Kyle

  using namespace boost; class A {}; class B : public A {}; class X { virtual shared_ptr<A> foo(); }; class Y : public X { virtual shared_ptr<B> foo(); }; The return types aren't covariant (nor are they, therefore, legal), but they would be if I was using raw pointers instead. What's the commonly accepted idiom to work around this, if there is one?

  Read the article

• why do we have to send the const " type " reference instead of just the types name to the constructo

  - by hamza

  i m trying to make a simple program ( & yes , it is a homework ) that can generate Dates , & like most of normal people : i made my Class attributes private , i tried to send the same type that i m working on to the constructor but the complier have not accept it , i did some research & i found out that in cases like that people generously send a const "type" reference to the constructor witch meant to me that have not understand OOP well so why do we have to send the const " type " reference instead of just the types name to the constructor ? & please give me some links or websites for beginners PS : sorry for my English

  Read the article

• How to maintain fixed size of C variable types over different machines?

  - by Alex

  I've all this kind of functions. ssize_t fuc1(int var1, void *buf, size_t count); int func2(char *charPtr, int mode, int dev); short func3( long var2); problem is that data types in C has different sizes when compiled on different machines(64bit & 32bit). This is true for even void*. For some reasons. I need to ensure that these sizes all are same on every machine(64bit & 32bit). So, how should I modify these ?

  Read the article

• SvcUtil and /dconly generates XSD's for data types NOT marked with the DataContract attribute.

  - by Bellerephon

  Has anyone ever encountered a problem with Svcutil and the /dconly option where it generates metadata for EVERY data type in an Assembly, even if it is NOT marked with with the [DataContract()] attribute? It also appears to be generating metadata for types only referenced in the code, such as XmlDictionaryReaderQuotas even though these are not a part of the physical assembly that I generated metadata on. Some info: Using the .NET 4.0 version of SvcUtil. Does not matter if class is empty or not. No references are specified in the command line for SvcUtil. Command line: "C:\In Progress Work (Prospective)\Prospective Server\Prospective Server\Management\Prospective.Server.Server.NET40.Debug.AnyCPU.dll" /nologo /t:metadata /d:"C:\In Progress Work (Prospective)\Prospective Server\Prospective Server\Management" /dconly

  Read the article

• Why are Java primitive types' modifiers `public`, `abstract`, & `final`?

  - by oconnor0

  In the process of doing some reflection on Java types, I came across an oddity that I do not understand. Inspecting int for its modifiers returns public, abstract, and final. I understand public and final, but the presence of abstract on a primitive type is non-obvious to me. Why is this the case? Edit: I am not reflecting on Integer but on int: import java.lang.reflect.Modifier; public class IntegerReflection { public static void main(final String[] args) { System.out.println(String.format("int.class == Integer.class -> %b", int.class == Integer.class)); System.out.println(String.format("int.class modifiers: %s", Modifier.toString(int.class.getModifiers()))); System.out.println(String.format("Integer.class modifiers: %s", Modifier.toString(Integer.class.getModifiers()))); } } The output when run: int.class == Integer.class -> false int.class modifiers: public abstract final Integer.class modifiers: public final

  Read the article

• Would it be useful to change java to support both static and dynamic types?

  - by James A. N. Stauffer

  What if a Java allow both static and dynamic types. That might allow the best of both worlds. i.e.: String str = "Hello"; var temp = str; temp = 10; temp = temp * 5; Would that be possible? Would that be beneficial? Do any languages currently support both and how well does it work out? Here is a better example (generics can't be used but the program does know the type): var username = HttpServletRequest.getSession().getAttribute("username");//Returns a String if(username.length() == 0) { //Error }

  Read the article

• Which file types are worth compressing (zipping) for remote storage? For which of them the compresse

  - by user193655

  I am storing documents in sql server in varbinary(max) fileds, I use filestream optionally when a user has: (DB_Size + Docs_Size) ~> 0.8 * ExpressEdition_Max_DB_Size I am currently zipping all the files, anyway this is done because the Document Read/Write work was developed 10 years ago where Storage was more expensive than now. Many files when zipped are almost as big as the original (a zipped pdf is about 95% of original size). And anyway unzipping has some overhead, that becomes twice when I need also to "Check-in"/Update the file because I need to zip it. So I was thinking of giving to the users the option to choose whether the file type will be zipped or not by providing some meaningful default values. For my experience I would impose the following rules: 1) zip by default: txt, bmp, rtf 2) do not zip by default: jpg, jpeg, Microsoft Office files, Open Office files, png, tif, tiff Could you suggest other file types chosen among the most common or comment on the ones I listed here?

  Read the article

• Java: Is it possible to have a generic class that only takes types that can be compared?

  - by mr popo

  I wanted to do something along the lines of: public class MyClass<T implements Comparable> { .... } But I can't, since, apparently, generics only accept restrictions with subclasses, and not interfaces. It's important that I'm able to compare the types inside the class, so how should I go about doing this? Ideally I'd be able to keep the type safety of Generics and not have to convert the T's to Object as well, or just not write a lot of code overall. In other words, the simplest the better.

  Read the article

• EntityFramework 4.0: can you return different types depending on data in the database?

  - by user200341

  I have a Media table in the database. I also have an IMedia interface. I have two different media types that implements the same interface: 1) AudioMedia 2) PictureMedia What I wonder here, is if I can use EntityFramework (I'm using an EDMX file but I have my models in a separate library, with automatic code generation turned off), and depending on the data in the database, select what type to get (AutioMedia or PictureMedia). Since they are both implementing the same interface (could be changed to an abstract class if needed I suppose), I'm thinking that somewhere along the way you could specify what class it should be. I should perhaps point out that I have a class that inherits from ObjectContext to access the objects. Perhaps there is something that that can be done?

  Read the article

• Is it possible to have file filters for multiple extension types?

  - by Jon Cage

  I'm using a standard Windows FileDialog to allow the user to select some files. I'd like to filter out only the file types I'm interested in though (lets call them *.a and *.b). Is there any way to do this without using *.*? I've tried the following but it fails to match any files at all: this->openFileDialog1->DefaultExt = L"*.a,*.b"; this->openFileDialog1->FileName = L"openFileDialog1"; this->openFileDialog1->Filter = L"My Data Files (*.a,*.b)|*.a,*.b";

  Read the article

• How does make_pair know the types of its args?

  - by bobobobo

  The definition for make_pair in the MSVC++ "utility" header is: template<class _Ty1, class _Ty2> inline pair<_Ty1, _Ty2> make_pair(_Ty1 _Val1, _Ty2 _Val2) { // return pair composed from arguments return (pair<_Ty1, _Ty2>(_Val1, _Val2)); } I use make_pair all the time though without putting the argument types in angle brackets: map<string,int> theMap ; theMap.insert( make_pair( "string", 5 ) ) ; Shouldn't I have to tell make_pair that the first argument is std::string and not char* ? How does it know?

  Read the article

• The Faces in the Crowdsourcing

  - by Applications User Experience

  By Jeff Sauro, Principal Usability Engineer, Oracle Imagine having access to a global workforce of hundreds of thousands of people who can perform tasks or provide feedback on a design quickly and almost immediately. Distributing simple tasks not easily done by computers to the masses is called "crowdsourcing" and until recently was an interesting concept, but due to practical constraints wasn't used often. Enter Amazon.com. For five years, Amazon has hosted a service called Mechanical Turk, which provides an easy interface to the crowds. The service has almost half a million registered, global users performing a quarter of a million human intelligence tasks (HITs). HITs are submitted by individuals and companies in the U.S. and pay from $.01 for simple tasks (such as determining if a picture is offensive) to several dollars (for tasks like transcribing audio). What do we know about the people who toil away in this digital crowd? Can we rely on the work done in this anonymous marketplace? A rendering of the actual Mechanical Turk (from Wikipedia) Knowing who is behind Amazon's Mechanical Turk is fitting, considering the history of the actual Mechanical Turk. In the late 1800's, a mechanical chess-playing machine awed crowds as it beat master chess players in what was thought to be a mechanical miracle. It turned out that the creator, Wolfgang von Kempelen, had a small person (also a chess master) hiding inside the machine operating the arms to provide the illusion of automation. The field of human computer interaction (HCI) is quite familiar with gathering user input and incorporating it into all stages of the design process. It makes sense then that Mechanical Turk was a popular discussion topic at the recent Computer Human Interaction usability conference sponsored by the Association for Computing Machinery in Atlanta. It is already being used as a source for input on Web sites (for example, Feedbackarmy.com) and behavioral research studies. Two papers shed some light on the faces in this crowd. One paper tells us about the shifting demographics from mostly stay-at-home moms to young men in India. The second paper discusses the reliability and quality of work from the workers. Just who exactly would spend time doing tasks for pennies? In "Who are the crowdworkers?" University of California researchers Ross, Silberman, Zaldivar and Tomlinson conducted a survey of Mechanical Turk worker demographics and compared it to a similar survey done two years before. The initial survey reported workers consisting largely of young, well-educated women living in the U.S. with annual household incomes above $40,000. The more recent survey reveals a shift in demographics largely driven by an influx of workers from India. Indian workers went from 5% to over 30% of the crowd, and this block is largely male (two-thirds) with a higher average education than U.S. workers, and 64% report an annual income of less than $10,000 (keeping in mind $1 has a lot more purchasing power in India). This shifting demographic certainly has implications as language and culture can play critical roles in the outcome of HITs. Of course, the demographic data came from paying Turkers $.10 to fill out a survey, so there is some question about both a self-selection bias (characteristics which cause Turks to take this survey may be unrepresentative of the larger population), not to mention whether we can really trust the data we get from the crowd. Crowds can perform tasks or provide feedback on a design quickly and almost immediately for usability testing. (Photo attributed to victoriapeckham Flikr While having immediate access to a global workforce is nice, one major problem with Mechanical Turk is the incentive structure. Individuals and companies that deploy HITs want quality responses for a low price. Workers, on the other hand, want to complete the task and get paid as quickly as possible, so that they can get on to the next task. Since many HITs on Mechanical Turk are surveys, how valid and reliable are these results? How do we know whether workers are just rushing through the multiple-choice responses haphazardly answering? In "Are your participants gaming the system?" researchers at Carnegie Mellon (Downs, Holbrook, Sheng and Cranor) set up an experiment to find out what percentage of their workers were just in it for the money. The authors set up a 30-minute HIT (one of the more lengthy ones for Mechanical Turk) and offered a very high $4 to those who qualified and $.20 to those who did not. As part of the HIT, workers were asked to read an email and respond to two questions that determined whether workers were likely rushing through the HIT and not answering conscientiously. One question was simple and took little effort, while the second question required a bit more work to find the answer. Workers were led to believe other factors than these two questions were the qualifying aspect of the HIT. Of the 2000 participants, roughly 1200 (or 61%) answered both questions correctly. Eighty-eight percent answered the easy question correctly, and 64% answered the difficult question correctly. In other words, about 12% of the crowd were gaming the system, not paying enough attention to the question or making careless errors. Up to about 40% won't put in more than a modest effort to get paid for a HIT. Young men and those that considered themselves in the financial industry tended to be the most likely to try to game the system. There wasn't a breakdown by country, but given the demographic information from the first article, we could infer that many of these young men come from India, which makes language and other cultural differences a factor. These articles raise questions about the role of crowdsourcing as a means for getting quick user input at low cost. While compensating users for their time is nothing new, the incentive structure and anonymity of Mechanical Turk raises some interesting questions. How complex of a task can we ask of the crowd, and how much should these workers be paid? Can we rely on the information we get from these professional users, and if so, how can we best incorporate it into designing more usable products? Traditional usability testing will still play a central role in enterprise software. Crowdsourcing doesn't replace testing; instead, it makes certain parts of gathering user feedback easier. One can turn to the crowd for simple tasks that don't require specialized skills and get a lot of data fast. As more studies are conducted on Mechanical Turk, I suspect we will see crowdsourcing playing an increasing role in human computer interaction and enterprise computing. References: Downs, J. S., Holbrook, M. B., Sheng, S., and Cranor, L. F. 2010. Are your participants gaming the system?: screening mechanical turk workers. In Proceedings of the 28th international Conference on Human Factors in Computing Systems (Atlanta, Georgia, USA, April 10 - 15, 2010). CHI '10. ACM, New York, NY, 2399-2402. Link: http://doi.acm.org/10.1145/1753326.1753688 Ross, J., Irani, L., Silberman, M. S., Zaldivar, A., and Tomlinson, B. 2010. Who are the crowdworkers?: shifting demographics in mechanical turk. In Proceedings of the 28th of the international Conference Extended Abstracts on Human Factors in Computing Systems (Atlanta, Georgia, USA, April 10 - 15, 2010). CHI EA '10. ACM, New York, NY, 2863-2872. Link: http://doi.acm.org/10.1145/1753846.1753873

  Read the article

• How do you handle authentication across domains?

  - by William Ratcliff

  I'm trying to save users of our services from having to have multiple accounts/passwords. I'm in a large organization and there's one group that handles part of user authentication for users who are from outside the facility (primarily for administrative functions). They store a secure cookie to establish a session and communicate only via HTTPS via the browser. Sessions expire either through: 1) explicit logout of the user 2) Inactivity 3) Browser closes My team is trying to write a web application to help users analyze data that they've taken (or are currently taking) while at our facility. We need to determine if a user is 1) authenticated 2) Some identifier for that user so we can store state for them (what analysis they are working on, etc.) So, the problem is how do you authenticate across domains (the authentication server for the other application lives in a border region between public and private--we will live in the public region). We have come up with some scenarios and I'd like advice about what is best practice, or if there is one we haven't considered. Let's start with the case where the user is authenticated with the authentication server. 1) The authentication server leaves a public cookie in the browser with their primary key for a user. If this is deemed sensitive, they encrypt it on their server and we have the key to decrypt it on our server. When the user visits our site, we check for this public cookie. We extract the user_id and use a public api for the authentication server to request if the user is logged in. If they are, they send us a response with: response={ userid :we can then map this to our own user ids. If necessary, we can request additional information such as email-address/display name once (to notify them if long running jobs are done, or to share results with other people, like with google_docs). account_is_active:Make sure that the account is still valid session_is_active: Is their session still active? If we query this for a valid user, this will have a side effect that we will reset the last_time_session_activated value and thus prolong their session with the authentication server last_time_session_activated: let us know how much time they have left ip_address_session_started_from:make sure the person at our site is coming from the same ip as they started the session at } Given this response, we either accept them as authenticated and move on with our app, or redirect them to the login page for the authentication server (question: if we give an encrypted portion of the response (signed by us) with the page to redirect them to, do we open any gaping security holes in the authentication server)? The flaw that we've found with this is that if the user visits evilsite.com and they look at the session cookie and send a query to the public api of the authentication server, they can keep the session alive and if our original user leaves the machine without logging out, then the next user will be able to access their session (this was possible before, but having the session alive eternally makes this worse). 2) The authentication server redirects all requests made to our domain to us and we send responses back through them to the user. Essentially, they act as a proxy. The advantage of this is that we can handshake with the authentication server, so it's safe to be trusted with the email address/name of the user and they don't have to reenter it So, if the user tries to go to: authentication_site/mysite_page1 they are redirected to mysite. Which would you choose, or is there a better way? The goal is to minimize the "Yet Another Password/Yet another username" problem... Thanks!!!!

  Read the article

< Previous Page | 284 285 286 287 288 289 290 291 292 293 294 295  | Next Page >