Search Results

Search found 2390 results on 96 pages for 'concrete inheritance'.

Page 53/96 | < Previous Page | 49 50 51 52 53 54 55 56 57 58 59 60  | Next Page >

  • Ruby tutorial for experienced programmers

    - by Skillwired
    I'm looking for a Ruby tutorial which would be usable for Java programmers with 8+ years of experience. I don't need another tutorial which explains basic programing/OOP/OOD concepts (inheritance, polymorphism, encapsulation, classes, constructors, hashes, etc.), just a fast-track tutorial (or even a reference?) which could tell us how to do specific things in Ruby.

    Read the article

  • Not finding field in polymorphic association with Doctrine2

    - by dimirc
    I have a polymorphic association (Class Table Inheritance) and I need use DQL to query entities of a specific child class wich can be done using "x INSTANCE OF Entity" in WHERE clause. Now I need to put conditions specific for that child class but I get this error: "Class Person has no association named student_field_1" Person = Parent Class Employee = Child class Student = Child class is there any way yo cast of somehow tell Doctrine that the Person is actually a Student and to allow me to put Student fields in the WHERE?

    Read the article

  • Convert a custom config class into POCO

    - by BozoJoe
    Given a set custom configuration classes based off ConfigurationElement I want to convert the custom class into a POCO object graph. Could reflection and LINQ extension methods give me an object which removes the ConfigurationElement inheritance?

    Read the article

  • StructureMap Autowiring with two different instances of the same interface

    - by Lambda
    For the last two days, i tried my best to learn something about StructureMap, using an old project of mine as an concrete implementation example. I tried to simplify my question as much as possible. While i will post my examples in vb.net, answers with examples in C# are also okay. The project includes an interfaces called IDatabase which connects itself to a Database. The important part looks like this. Public Interface IDatabase Function Connect(ByVal ConnectionSettings As ConnectionSettings) As Boolean ReadOnly Property ConnectionOpen As Boolean [... more functions...] End Interface Public Class MSSQLConnection Implements IDatabase Public Function Connect(ByVal ConnectionSettings As ConnectionSettings) As Boolean Implements IDatabase.Connect [... Implementation ...] End Function [... more implementations...] End Class ConnectionSettings is a structure that has all the information needed to connect to a Database. I want to open the Database Connection once and use it for every single connection in the project, so i register a instance in the ObjectFactory. dim foo = ObjectFactory.GetInstance(Of MSSQLConnection)() dim bar as ConnectionSettings foo.connect(bar) ObjectFactory.Configure(Sub(x) x.For(Of IDatabase).Use(foo)) Up until this part, everything works like a charm. Now, i get to a point where i hav e classes that need an additional instance of IDatabase because they connect to a second database. Public Class ExampleClass Public Sub New(ByVal SameOldDatabase as IDatabase, ByVal NewDatabase as IDatabase) [...] Magic happens here [...] End Sub End Class I want this second IDatabase to behave much like the first one. I want it to use a concrete, single instance and want to connect it to a different database invoking Connect with a different ConnectionSettings. The problem is: While i'm pretty sure it's somewhow possible, (my initial idea was registering ExampleClass with alternative constructor arguments), i actually want to do it without registering ExampleClass. This probably involves more configuration, but i have no idea how to do it. So, basically, it comes down to this question: How do i configurate the ObjectFactory in a way that the autowiring always invokes the constructor with object Database1 for the first IDatabase parameter and object Database2 for the second one (if there is one?)

    Read the article

  • What does "prototyping" mean in practice?

    - by prot
    When I recently asked about the uses of Ruby someone told me it was good for prototyping. I basically know what that means, quickly get the very base of your app up and working, see if there are conceptual problems and then add the rest. Am I right with how I understand prototyping? What would be a concrete example of prototyping a Snake game in Ruby or any other language?

    Read the article

  • Spring MVC validation with Annotations

    - by cdecker
    I'm having quite some trouble since I migrated my controllers from classical inheritance to use the annotations like @Controller and @RequestMapping. The problem is that I don't know how to plug in validation like in the old case. Are there any good tutorials about this?

    Read the article

  • how can I future-proof migration of a ADO.net local data layer to a future web based interface (web-

    - by Greg
    Hi, BACKGROUND: I am working on a .NET WinForms application now (C#) with an ADO.net database for the data layer. QUESTION: How an I develop this now such that it would be easy to migrate to a model where the data layer is abstracted via a HTTP web-service or REST interface? For example would just use of a standard C# interface with a Factory to obtain a concrete implementation of the interface where this uses ADO.net be the best? thanks

    Read the article

  • Unit of Work Pattern in .Net

    - by Jazza
    Does anyone have any concrete examples of a simple Unit of Work pattern in C# or Visual Basic that would handle the following scenario? I'm writing a WinForms application in which a customer can have multiple addresses associated with it. The user can add, edit and delete addresses belonging to the customer before the customer is saved back to the database. Therefore, at the time of saving, all the original addresses need to be deleted from the database and the new addresses added in a single transaction.

    Read the article

  • Going from a math career to a cs career: how to do it?

    - by Joseph
    Hey, I'm looking for some advice on how to successfully make the transition from mathematics to CS. My academic background is in mathematics (BS and MSc), and I've taken loads of math courses as well. You name it, and I took it: Measure Theory, Algebra, PDES, Manifolds, Complex Analysis, etc. I progressed quite far along this track, and at one point, I thought I would be a professional mathematician...But around the time I was finishing my MSc, I really got sick of it. Studying very abstract mathematics was fun, but it really lost it's appeal to me. Outside of a couple hundred people, I'm not sure if anybody would understand my research. I did not want to be 60 years old and say that my only contribution to the world consisted of published papers. Anyways, I've been an off and on hobbyist programmer since 2002. I've programmed in C and Java (just small projects), and I really started to be drawn to the area as time passed. There's a real appeal to CS work because, well, it actually means something to other people out there! I enjoy all parts of it: designing webpages (a real artistic appeal). On the other end, I do enjoy toying with compilers and more nitty-gritty stuff as well. Suffice to say, I have broad interests out there. Anyways, I know it's a bit late, but I was wondering if there were other folks out there who made the change, and if so, how I could do so. I know I have some fairly big gaps to fill in terms of data structures, lack of internship experience, etc. But I really would like to make this work. So my question is simply: How can I make the switch from math to CS? To pay the bills, I'll be doing financial analysis for a company, but I'd like to eventually transition into a developer type position. I've been reading "Algorithm Design" by Tardos and doing all the problems. It's not hard to make progress since the problems are far more concrete than the stuff I've been doing the past six years. I feel I can make fairly rapid progress in picking up all the materials from data structures, etc. but none of it can substitute the past several years I've lost. Anyways, I'm eager to learn but would love some advice/concrete direction. Thanks, Joseph

    Read the article

  • Is html font size using em still important

    - by JohnnyHTML
    In a web LOB web based SaaS product we are developing that we explicitly not support IE 6, only IE7/8, FF 3, Chrome, Opera, WebKit etc... which allow px resize as standard, is it still important to use em rather than px? Its a lot more work to consider the compute font size (size em are computed from their inheritance chain) especially when nesting html reuse components where a font-size has already been specified in an outer container.

    Read the article

  • What's the keychain service in iPhone?

    - by hgpc
    What's the keychain service (kSecAttrService) in iPhone? I haven't found a concrete definition of "service" in the docs. Is it just a category for keychain items inside my app? Does the value matter other than categorizing items inside my app? Thanks.

    Read the article

  • Matrices of "long"s in Java/COLT?

    - by Darren Wilkinson
    I'm very new to Java/COLT so apologies if this is a dumb question... But, is it possible to define (2d) matrices of type "long" using the cern.colt.matrix stuff? If so, how?! I can find an abstract class for "Object" and a concrete implementation for "double", but then I am stuck... Thanks,

    Read the article

  • OCaml: Currying without defined values

    - by nicotine
    I have two functions f and g and I am trying to return f(g(x)) but I do not know the value of x and I am not really sure how to go about this. A more concrete example: if I have functions f = x + 1 and g = x * 2 and I am trying to return f(g(x)) I should get a function equal to (x*2) + 1

    Read the article

  • defining class relationships in c# and visual studio 2010

    - by andy
    Hey guys, in Visual Studio 2010 I can point to a bunch of classes and create a diagram. However, the diagram by default doesn't recognize any relationships between the classes, except inheritance and implementations. Is there a way, ideally by using Attributes, to define class and property relationships and associations in such a way that it is picked up by a new Class Diagram automatically? cheers!

    Read the article

  • Abstract class reference

    - by AlgoMan
    Can i have a class Class Room{ ~Room(); virtual cost() =0; } Class Hotel{ map rooms; /* */ }; will my hotel become abstract ? Can it hold the list of concrete Room objects that are derived from Room ?

    Read the article

  • question about books

    - by davit-datuashvili
    i have question how good is this book? http://www.amazon.com/Concrete-Mathematics-Foundation-Computer-Science/dp/0201558025/ ? and can anybody advise good books about bit manipulations? for example how good is this book? http://www.amazon.com/Hackers-Delight-Henry-S-Warren/dp/0201914654/

    Read the article

  • Simple haskell string manage

    - by paurullan
    Theres is a little problem I want to solve with Haskell: let substitute a function that change all of the wildcards in a string for one concrete parameter. The function has de signature of: subs :: String -> String -> String -> String -- example: -- subs 'x' "x^3 + x + sin(x)" "6.2" will generate -- "6.2^3 + 6.2 + sin(6.2)"

    Read the article

  • Why does Microsoft Windows' performance appear to degrade over time?

    - by Ben Aston
    Windows XP/2k3 and earlier (can't attest to Vista, but suspect it's the same) all appear to become more sluggish over time as applications are installed and uninstalled. This is not a scientifically tested observation, but more of a learned-through-experience piece of wisdom. (I've always suspected the registry as being behind the issue.) Does anyone have any concrete evidence of this degradation occurring, or it just an invalid perception of mine?

    Read the article

  • Call WCF service host directly

    - by Steven
    I'm hosting a WCF service inside a winform app. I want to monitor when somebody calls the service to a textbox on the form like: 2:23 Method X called params(x, y) 2:24 Method Y called params(z) I am using a service host for WCF and inside my concrete class I have created some delegates and events. I just cant seem to wire the events up because my object is of type ServiceHost not my object. Any help

    Read the article

< Previous Page | 49 50 51 52 53 54 55 56 57 58 59 60  | Next Page >