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

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F# return type coercion

- by Alex

Hi, In F# I have a function that returns System.Linq.Expression instances: and System.Object with member this.ToExpression() = match this with | :? System.Int32 -> Expression.Constant(this) :> Expression | :? System.Boolean -> Expression.Constant(this) :> Expression | :? Tml.Runtime.Seq as s -> s.ToExpression() …

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How to discover Font Type?

- by Fábio

Is there a way to determine the type of a given font (TrueType, OpenType, Type 1, Bitmap) using javascript?

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Problem compiling c++ in CodeGear

- by Carlos

I have written a C++ program for a University assignment. I used Netbeans 6.8 running on my Mac and the code runs smoothly, no warnings, errors or problems/bugs. However when compiling and running on a Windows computer using CodeGear RAD Studio 2009 (C++ Builder) am getting several errors. [BCC32 Error] main.cpp(51): E2094 'operator<<' not…

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jQuery: get the file name selected from <input type="file" />

- by ConNen

This code should work in IE (don't even test it in Firefox), but it doesn't. What I want is to display the name of the attached file. Any help? <html> <head> <title>example</title> <script type="text/javascript" src="../js/jquery.js"></script> <script type="text/javascript"> …

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std::map default value for build-in type

- by Qifa Zhao

Recently, I was confused by the std::map operator[] function. In the MSDN library, it says: "If the argument key value is not found, then it is inserted along with the default value of the data type." I tryed to search much more exactly explanation for this issue. For example here: std::map default value In this page, Michael…

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Checking if Type instance is a nullable enum in C#

- by adrin

How do i check if a Type is a nullable enum in C# something like Type t = GetMyType(); bool isEnum = t.IsEnum; //Type member bool isNullableEnum = t.IsNullableEnum(); How to implement this extension method?

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C++/CLI com-Interop: Exposing a reference type property to VBA

- by Adam

After long hours of investigation on exposing C# property that accepts a reference type to VBA, I concluded that it was not possible. In brief, a C# property that is of type double[] or even an object cannot be consumed in VBA like this: ' Compile Error: Function or interface marked as restricted, ' or the function uses an…

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How To Get Type Info Without Using Generics?

- by DaveDev

Hi Guys I have an object obj that is passed into a helper method. public static MyTagGenerateTag<T>(this HtmlHelper htmlHelper, T obj /*, ... */) { Type t = typeof(T); foreach (PropertyInfo prop in t.GetProperties()) { object propValue = prop.GetValue(obj, null); string stringValue =…

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Replication - User defined table type not propogating to subscriber

- by Aamod Thakur

I created a User defined table type named tvp_Shipment with two columns (id and name) . generated a snapshot and the User defined table type was properly propogated to all the subscribers. I was using this tvp in a stored procedure and everything worked fine. Then I wanted to add one more column created_date to this…

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how to convert textbox type to password in asp.net mvc

- by Fraz Sundal

how to convert textbox type to password in asp.net mvc

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Haskell Type error

- by Jon

I am getting a Couldn't match expected type error on this code and am not sure why. Would appreciate it if someone could point me in the right direction as to fixing it. import qualified Data.ByteString.Lazy as S import Data.Binary.Get import Data.Word getBinary :: Get Word16 getBinary = do a <- getWord16be…

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Type patterns and generic classes in Haskell

- by finnsson

I'm trying to understand type patterns and generic classes in Haskell but can't seem to get it. Could someone explain it in laymen's terms? In [1] I've read that "To apply functions generically to all data types, we view data types in a uniform manner: except for basic predefined types such as Float, IO, and…

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What is Jdbc type 5 driver

- by Ranjith

What is Jdbc type 5 driver ? What are all the benfits of type 5 driver ? Can I get any links/tutorials abt type 5 driver? Thanks, Ranjith

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Possible form field types per model field type

- by Jonathan

Django's documentation specifies for each model field type the corresponding default form field type. Alas, I couldn't find in the documentation, or anywhere else, what form field types are possible per model field type. Not all combinations are possible, right? Same question for widgets...

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Create xml type with no body

- by Pace

Hopefully this is an easy question. How can I define an XML type such that the type doesn't have a body. As an example I can define the Foo type as follows... <xs:complexType name="Foo"> <xs:simpleContent> <xs:extension base="xs:string"> <xs:attribute name="id"…

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Using C# Type as generic

- by I Clark

I'm trying to create a generic list from a specific Type that is retrieved from elsewhere: Type listType; // Passed in to function, could be anything var list = _service.GetAll<listType>(); However I get a build error of: The type or namespace name 'listType' could not be found (are you missing a…

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Error loading SQL_VARIANT data type using Python

- by Brett D

I am using Python and SQLAlchemy to query a database that I did not create. I have run into a problem querying a table that contains the SQL_VARIANT data type. I get the error: sqlalchemy.exc.DBAPIError: (Error) ('ODBC data type -150 is not supported. Cannot read column Value.', 'HY000') I…

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.NET generic class instance - passing a variable data type

- by FerretallicA

As the title suggests, I'm tyring to pass a variable data type to a template class. Something like this: frmExample = New LookupForm(Of Models.MyClass) 'Works fine Dim SelectedType As Type = InstanceOfMyClass.GetType() 'Works fine frmExample = New LookupForm(Of SelectedType) 'Ba-bow! frmExample =…

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$_POST goes empty after adding a new input type "file"

- by heldrida

Hi, I'm not finding a way to understand and fix this and I've done a lot. I've got a script, wish is a simple form, that sends a file trough POST. The second file, process the info. By default, I give to the user a few fields, one of them being a input field of type "file" and there's also, a…

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How to create a dependency property of type Type, and assign it in the XAML ?

- by Nicolas Dorier

I'd like to know how I can assign in XAML a dependency property of type Type in Silverlight since the markup extension {x:Type} does not exist ? Thanks,

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Design Patterns: What is a type

- by contactmatt

A very basic question, but after reading the "Design Patterns: Elements of reusable OO Software" book, I'm a little confused. The book states, "An object's type only refers to its interface-the set of request to which it can respond. An object can have many types, and objects of…

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'Lexical' scoping of type parameters in C#

- by leppie

I have 2 scenarios. This fails: class F<X> { public X X { get; set; } } error CS0102: The type 'F' already contains a definition for 'X' This works: class F<X> { class G { public X X { get; set; } } } The only logical explanation is that in the second snippet…

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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…

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How to implement table-per-concrete-type strategy using entity framework

- by SDReyes

Hello Guys! I'm mapping a set of tables that share a common set of fields: So as you can see I'm using a table-per-concrete-type strategy to map the inheritance. But... I have not could to relate them to an abstract type containing these common properties. It's possible to do it…

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I can't change HTTP request header Content-Type value using jQuery

- by Matt

Hi I tried to override HTTP request header content by using jQuery's AJAX function. It looks like this $.ajax({ type : "POST", url : url, data : data, contentType: "application/x-www-form-urlencoded;charset=big5", beforeSend: function(xhr) { …

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