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  • Interface (contract), Generics (universality), and extension methods (ease of use). Is it a right design?

    - by Saeed Neamati
    I'm trying to design a simple conversion framework based on these requirements: All developers should follow a predefined set of rules to convert from the source entity to the target entity Some overall policies should be able to be applied in a central place, without interference with developers' code Both the creation of converters and usage of converter classes should be easy To solve these problems in C# language, A thought came to my mind. I'm writing it here, though it doesn't compile at all. But let's assume that C# compiles this code: I'll create a generic interface called IConverter public interface IConverter<TSource, TTarget> where TSource : class, new() where TTarget : class, new() { TTarget Convert(TSource source); List<TTarget> Convert(List<TSource> sourceItems); } Developers would implement this interface to create converters. For example: public class PhoneToCommunicationChannelConverter : IConverter<Phone, CommunicationChannle> { public CommunicationChannel Convert(Phone phone) { // conversion logic } public List<CommunicationChannel> Convert(List<Phone> phones) { // conversion logic } } And to make the usage of this conversion class easier, imagine that we add static and this keywords to methods to turn them into Extension Methods, and use them this way: List<Phone> phones = GetPhones(); List<CommunicationChannel> channels = phones.Convert(); However, this doesn't even compile. With those requirements, I can think of some other designs, but they each lack an aspect. Either the implementation would become more difficult or chaotic and out of control, or the usage would become truly hard. Is this design right at all? What alternatives I might have to achieve those requirements?

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  • Conversion of DVC-PRO HD 1080, any free tool?

    - by Andrea Ambu
    Is there any free (as in beer, and if it's possible as in bird) tool to convert a dvd in the format DVC-PRO HD 1080 to a normal/standard dvd format so that I can play it on a normal DVD player? EDIT: I changed the wording a bit. We've a video in DVC-PRO HD 1080 but as far as I know it is a proprietary format. We'd like to create a standard dvd out of it. I'm not really in video encoding and dvd conversion. I thought I need to be more precise. VLC currently doesn't support DVC-PRO HD 1080.

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  • Conversion of DVC-PRO HD 1080, any free tool?

    - by Andrea Ambu
    Is there any free (as in beer, and if it's possible as in bird) tool to convert a dvd in the format DVC-PRO HD 1080 to a normal/standard dvd format so that I can play it on a normal DVD player? EDIT: I changed the wording a bit. We've a video in DVC-PRO HD 1080 but as far as I know it is a proprietary format. We'd like to create a standard dvd out of it. I'm not really in video encoding and dvd conversion. I thought I need to be more precise. VLC currently doesn't support DVC-PRO HD 1080.

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  • The Benefits of PSD to HTML Conversion

    In the world of web designing the current trend among the designers is to convert PSD to HTML. If one looks at the reasons for such popularity of the conversion process, he or she would come across not only but multiple reasons.

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  • Program for Format Conversion of An Image

    .NET provides extensive support for image conversion. Any image can be processed from one format to another. Most common formats to which .NET have support for are .BMP, .EMF, .GIF, .ICO, .JPG, .PNG, .TIF and .WMF....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Data Conversion with Silverlight 3

    In this conclusion to a five-part series on data binding with Silverlight 3 we will discuss data conversion. As with the other parts we ll explain when and why you need to convert data and go through a step-by-step process to show you how it s done.... Cloud Servers in Demand - GoGrid Start Small and Grow with Your Business. $0.10/hour

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  • How to Increase Conversion Rate of Your Website

    Conversion Rate is the frequency or percentage of your website visitors who were successfully converted to purchase a sale of your products or services through the use of your Calls to Action or CTA. Call to action buttons are the buttons that you, as a web designer, want all your users to click on when they land on your page. Usually they'll be a link to a download, signup or sale.

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  • Five Tips For Increasing Website Conversion Rate - SEO

    If you run a business online, you are probably aware of the many changes that take place on the World Wide Web on a daily basis. Failing to track your website conversion rate and not update your site can bring you out of the loop just as quickly as you were added. This does not, of course, mean the visibility of your site will go away, but it does mean you will not be as visible.

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  • Data Conversion in SQL Server

    Most of the time, you do not have to worry about implicit conversion in SQL expressions, or when assigning a value to a column. Just occasionally, though, you'll find that data gets truncated, queries run slowly, or comparisons just seem plain wrong. Robert Sheldon explains why you sometimes need to be very careful if you mix data types when manipulating values. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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  • Why do I need an intermediate conversion to go from struct to decimal, but not struct to int?

    - by Jesse McGrew
    I have a struct like this, with an explicit conversion to float: struct TwFix32 { public static explicit operator float(TwFix32 x) { ... } } I can convert a TwFix32 to int with a single explicit cast: (int)fix32 But to convert it to decimal, I have to use two casts: (decimal)(float)fix32 There is no implicit conversion from float to either int or decimal. Why does the compiler let me omit the intermediate cast to float when I'm going to int, but not when I'm going to decimal?

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  • warning: incompatible implicit declaration of built-in function ‘xyz’

    - by Alex Reynolds
    I'm getting a number of these warnings when compiling a few binaries: warning: incompatible implicit declaration of built-in function ‘strcpy’ warning: incompatible implicit declaration of built-in function ‘strlen’ warning: incompatible implicit declaration of built-in function ‘exit’ To try to resolve this, I have added #include <stdlib.h> at the top of the C files associated with this warning, in addition to compiling with the following flags: CFLAGS = -fno-builtin-exit -fno-builtin-strcat -fno-builtin-strncat -fno-builtin-strcpy -fno-builtin-strlen -fno-builtin-calloc I am using GCC 4.1.2: $ gcc --version gcc (GCC) 4.1.2 20080704 What should I do to resolve these warnings? Thanks for your advice.

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  • Why do Java and C# not have implicit conversions to boolean?

    - by Shaun
    Since I started Java it's been very aggravating for me that it doesn't support implicit conversions from numeric types to booleans, so you can't do things like: if (flags & 0x80) { ... } instead you have to go through this lunacy: if ((flags & 0x80) != 0) { ... } It's the same with null and objects. Every other C-like language I know including JavaScript allows it, so I thought Java was just moronic, but I've just discovered that C# is the same (at least for numbers, don't know about null/objects): http://msdn.microsoft.com/en-us/library/c8f5xwh7(VS.71).aspx Microsoft changed it on purpose from C++, so why? Clearly I'm missing something. Why change (what I thought was) the most natural thing in the world to make it longer to type? What on Earth is wrong with it?

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  • What is the rationale to not allow overloading of C++ conversions operator with non-member function

    - by Vicente Botet Escriba
    C++0x has added explicit conversion operators, but they must always be defined as members of the Source class. The same applies to the assignment operator, it must be defined on the Target class. When the Source and Target classes of the needed conversion are independent of each other, neither the Source can define a conversion operator, neither the Target can define a constructor from a Source. Usually we get it by defining a specific function such as Target ConvertToTarget(Source& v); If C++0x allowed to overload conversion operator by non member functions we could for example define the conversion implicitly or explicitly between unrelated types. template < typename To, typename From > operator To(const From& val); For example we could specialize the conversion from chrono::time_point to posix_time::ptime as follows template < class Clock, class Duration> operator boost::posix_time::ptime( const boost::chrono::time_point<Clock, Duration>& from) { using namespace boost; typedef chrono::time_point<Clock, Duration> time_point_t; typedef chrono::nanoseconds duration_t; typedef duration_t::rep rep_t; rep_t d = chrono::duration_cast<duration_t>( from.time_since_epoch()).count(); rep_t sec = d/1000000000; rep_t nsec = d%1000000000; return posix_time::from_time_t(0)+ posix_time::seconds(static_cast<long>(sec))+ posix_time::nanoseconds(nsec); } And use the conversion as any other conversion. For a more complete description of the problem, see here or on my Boost.Conversion library.. So the question is: What is the rationale to non allow overloading of C++ conversions operator with non-member functions?

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  • Cocos2d-x v3 invalid conversion from 'cocos2d::Layer* [on hold]

    - by Hammerh5
    Hello guys I'm learning cocos2d-x v3 right but most of the code that I can find is to the version 2. My specific error is this one, when I try to compile my cocos2s-x 3 project this error shows. invalid conversion from 'cocos2d::Layer to Game* [-fpermisive]* What I want to do is create a new game scene in the following code: //Game.cpp #include "Game.h" Scene* Game::scene() { scene *sc = CCScene::create(); sc->setTag(TAG_GAME_SCENE); const Game *g = Game::create(); //Here is where the conversions fails. sc->addChild(g, 0, TAG_GAME_LAYER); return sc; } Of course this is my header file //Game.h #include "cocos2d.h" #include "Mole.h" #include "AppDelegate.h" using namespace cocos2d; class Game: public cocos2d::Layer { cocos2d::CCArray *moles; float timeBetweenMoles, timeElapsed, increaseMolesAtTime, increaseElapsed, lastMoleHiTime; int molesAtOnce; cocos2d::CCSize s; bool isPaused; public: CCString *missSound, *hitSound; static cocos2d::Scene* scene(); virtual bool init(); void showMole(); void initializeGame(); void onEnterTransitionDidFinish(); void onExit(); void onTouchesBegan(const std::vector<cocos2d::Touch *> &touches, cocos2d::Event *event); void tick(float dt); cocos2d::CCArray* getMoles(bool isUp); //LAYER_CREATE_FUNC(Game); }; #endif /* GAME_H_ */ I don't know what's wrong I suppose this code works fine in Cocos2d-x v2. It's maybe some changes in the C++ version ?

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  • Implicit Lazy Loading vs Explicit Lazy Loading

    - by Tarik
    I've been reading Entity Framework and people were crying over why there was not implicit lazy loading or something. Basically I've been searching things about Lazy Loading and now I know what it is : It is a design pattern which allows us to load objects when they are really needed. But what is the difference between Explicit Lazy Loading and Implicit Lazy Loading. Thanks in advance...

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  • Visual Studio macro to read compilation errors and fix implicit conversions automatically in VB.NET

    - by eckesicle
    I am converting a large project in VB.NET that is using Option Strict Off into Option Strict On Naturally I am running into the same compilation error over and over. Strict On does not allow implicit conversion from Object to String/Integer/Double Is it possible to to access the compilation errors with a macro and automatically append .ToString() to the erroneous implicit conversion. Essentially my question is a duplicate off http://stackoverflow.com/questions/2532340/tools-to-convert-option-strict-off-code-into-option-strict-on but that question had no answers. Cheers.

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  • What exactly are administrative redexes after CPS conversion?

    - by eljenso
    In the context of Scheme and CPS conversion, I'm having a little trouble deciding what administrative redexes (lambdas) exactly are: all the lambda expressions that are introduced by the CPS conversion only the lambda expressions that are introduced by the CPS conversion but you wouldn't have written if you did the conversion "by hand" or through a smarter CPS-converter If possible, a good reference would be welcome.

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  • Raw Audio Conversion

    - by Walidix
    While, I'm reading gstreamer document I found this: " Audioconvert converts raw audio buffers between various possible formats. It supports integer to float conversion, width/depth conversion, signedness and endianness conversion and channel transformations." I only understand "depth" (bit number per sample) "signedness and endianness" (for data representation) And now, I'm looking for explanations of : "integer to float conversion" "width" "channel transformations" Thanks in advance

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  • implicit declaration of

    - by gcc
    int i=0; char **mainp; for(i=0;i<2;++i) { mainp[i]=malloc(sizeof(char)*200); if(!scanf("%[^#],#",mainp[i])) break; if(i<2) scanf("%[^#],#",mainp[i]); } why does gcc send me that warnings warning: implicit declaration of function ‘scanf’ warning: incompatible implicit declaration of built-in function ‘scanf’ warning: ‘mainp’ may be used uninitialized in this function

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  • "Implicit declaration" warning

    - by gcc
    For this code: int i=0; char **mainp; for(i=0;i<2;++i) { mainp[i]=malloc(sizeof(char)*200); if(!scanf("%[^#],#",mainp[i])) break; if(i<2) scanf("%[^#],#",mainp[i]); } GCC emits the warnings: warning: implicit declaration of function ‘scanf’ warning: incompatible implicit declaration of built-in function ‘scanf’ warning: ‘mainp’ may be used uninitialized in this function And I get a segmentation fault at runtime

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  • Implicit conversion causes stack overflow

    - by user44242
    The following code snippet worked perfectly, then after some code changes in different files, I've started getting stack overflows resulting from recursive invocation of the implicit conversion. Has this ever happened to anyone, and if so what's the fix. implicit def comparable2ordered[A <: Comparable[_]](x: A): Ordered[A] = new Ordered[A] with Proxy { val self = x def compare(y: A): Int = { self.compareTo(y) } }

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