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  • Is there an equivalent in Scala to Python's more general map function?

    - by wheaties
    I know that Scala's Lists have a map implementation with signature (f: (A) => B):List[B] and a foreach implementation with signature (f: (A) => Unit):Unit but I'm looking for something that accepts multiple iterables the same way that the Python map accepts multiple iterables. I'm looking for something with a signature of (f: (A,B) => C, Iterable[A], Iterable[B] ):Iterable[C] or equivalent. Is there a library where this exists or a comparable way of doing similar?

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  • AutoFac Autowiring Conventions

    - by Johannes
    StructureMap has the ability to apply conventions when scanning. Thus IFoo = Foo, without explicit registration. Is something simular available in AutoFac? Looked around and just can't find anything helpfull. Thanks,

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  • shared library in C

    - by sasayins
    Hi, I am creating a shared library in C but don't know what is the correct implementation of the source codes. I want to create an API like for example, printHello, int printHello( char * text ); This printHello function will call another function: In source file, libprinthello.c, void printHello( char * text ) { printHi(); printf("%s", text); } Since this printHello function is the interface for the user or application: In header file libprinthello.h, extern void printHello( char * text); Then in the source file of the printHi function, printhi.c void printHi() { printf("Hi\n"); } Then my problem is, since printHello is the only function that I want to expose in the user, what implementation should I do in printHi function?

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  • Jax-ws 2.2 or Metro as Tomcat runtime environment

    - by EugeneP
    I need an implementation of JAX-WS, that is RUNTIME ENVIRONMENT to use a client for Tomcat6. Which is better in your opinion? JAX-WS 2.2 https://jax-ws.dev.java.net/2.2/ Metro 2.0 https://metro.dev.java.net/2.0/ They have different installation procedures and different jars. For now I only need to be able to run a client from under Tomcat6 web apps. But later I'm planning to use ApacheCXF soap web-service, that will run on this Tomcat. As I understand, CXF is a unique implementation that does not any of mentioned runtime environments, so I guess whatever between metro & jax-ws2.2 I choose does not matter, right? Still, which one do you recommend?

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  • WPF data grid - Column Header not aligned with data rows

    - by Pawan
    Hi, I am using Datagrid in WPF. This is a very simple and basic implementation. I not using any styles. I created a simple datagrid : <dg:DataGrid x:Name="dg" > </dg:DataGrid> and populated it with data as: dg.ItemsSource = " H E L L O W O R L D!".Split(); Grid gets properly populated but the columnheader of the grid is drawn with some offset. Due to this my data and header are mis aligned. I tried searching for this over net but I haven't found anything. This seems to be a straightforward implementation which is working for everyone except me :(. Can anyone please tell me what might be going wrong? I have tried using different data sets and appyling some style to test this. Thanks in advance.

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  • StructureMap: How to register the same instance for all its interfaces

    - by George Mauer
    StructureMap newbie question. public class SomeClass: IInterface1, IInterface2 { } I would like the following test to pass: Assert.AreSameInstance( container.GetInstance<IInterface1>(), container.GetInstance<IInterface2>()); How would I do an explicit registration of this? I know in Castle Windsor I would do something like kernel.Register(Component.For(typeof(IInterface1), typeof(IInterface2)) .ImplementedBy(typeof(SomeClass)); But I don't see any equivalent API

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  • How can I find the method that called the current method?

    - by flipdoubt
    When logging in C#, how can I learn the name of the method that called the current method? I know all about System.Reflection.MethodBase.GetCurrentMethod(), but I want to go one step beneath this in the stack trace. I've considered parsing the stack trace, but I am hoping to find a cleaner more explicit way, something like Assembly.GetCallingAssembly() but for methods.

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  • What operation type invoked a trigger in SQL Server 2008?

    - by Neil Moss
    I'm contemplating a single SQL trigger to handle INSERT, UPDATE and DELETE operations as part of an auditing process. Is there any statement, function or @@ variable I can interrogate to find out which operation type launched the trigger? I've seen the following pattern: declare @type char(1) if exists (select * from inserted) if exists (select * from deleted) select @Type = 'U' else select @Type = 'I' else select @Type = 'D' but is there anything else a little more direct or explicit? Thanks, Neil.

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  • Lazy/deferred loading of a CollectionViewSource?

    - by Shimmy
    When you create a CollectionViewSource in the Resources section, is the set Source loaded when the resources are initalized (i.e. when the Resources holder is inited) or when data is bound? Is there a xamly way to make a CollectionViewSource lazy-load? deferred-load? explicit-load?

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  • Including hibernate jar dependencies in ant build

    - by Patrick
    Hi, I'm trying to compile a runnable jar-file for a project that makes use of hibernate. I'm trying to construct an ant build.xml file to streamline my build process, but I'm having troubles with the inclusion of the hibernate3.jar inside the final jar-file. If I run the ant script I manage to include all my library jars, and they are put in the final jar-file's root. When I run the jar-file I get a java.lang.NoClassDefFoundError: org/hibernate/Session error. If I make use of the built-in export to jar in Eclipse, it works only if I choose "extract required libraries into jar". But that bloats the jar, and includes too much of my project (i.e. unit tests). Below is my generated manifest: Manifest-Version: 1.0 Main-Class: main.ServerImpl Class-Path: ./ antlr-2.7.6.jar commons-collections-3.1.jar dom4j-1.6.1.jar hibernate3.jar javassist-3.9.0.GA.jar jta-1.1.jar slf4j-api-1.5.11.jar slf4j-simple-1.5.11.jar mysql-connector-java-5.1.12-bin.jar rmiio-2.0.2.jar commons-logging-1.1.1.jar And the part of the build.xml looks like this: <target name="dist" depends="compile" description="Generates the Distribution Jar(s)"> <mkdir dir="${dist.dir}" /> <jar destfile="${dist.dir}/${dist.file.name}.jar" basedir="${build.prod.dir}" filesetmanifest="mergewithoutmain"> <manifest> <attribute name="Main-Class" value="${main.class}" /> <attribute name="Class-Path" value="./ ${manifest.classpath} " /> <attribute name="Implementation-Title" value="${app.name}" /> <attribute name="Implementation-Version" value="${app.version}" /> <attribute name="Implementation-Vendor" value="${app.vendor}" /> </manifest> <zipfileset refid="hibernatefiles" /> <zipfileset refid="slf4jfiles" /> <zipfileset refid="mysqlfiles" /> <zipfileset refid="commonsloggingfiles" /> <zipfileset refid="rmiiofiles" /> </jar> </target> The refids' for the zipfilesets point to the directories in a library directory lib in the root of the project. The manifest.classpath-variable takes the classpath of all those library jar-files, and flattens them with pathconvert and mapper. I've also tried to set the manifest classpath to ".", "./" and only the library jar, but to no difference at all. I'm hoping there's a simple remedy to my problems...

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  • Casting and dynamic vs static type in Java

    - by XpdX
    I'm learning about static vs dynamic types, and I am to the point of understanding it for the most part, but this case still eludes me. If class B extends A, and I have: A x = new B(); Is the following allowed?: B y = x; Or is explicit casting required?: B y = (B)x; Thanks!

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  • resharper "cleanup code" vs. 'var' keyword

    - by bitbonk
    I have an odd behavior with code clean up for c# in visual studio 2008 Team Developer Edition. Whenever I clean up my code using "Full Cleanup" it replaces all var declaration with explicit type declarations. But I have set the appropriate settings under "Inspection Severity" "Use var keyword when initializer explictly declares type" and "use var keyword when possible" to "Show as Error" Is there any other setting I need to set or is this a known bug?

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  • SQL join: where clause vs. on clause

    - by BCS
    After reading it, this is not a duplicate of Explicit vs Implicit SQL Joins. The answer may be related (or even the same) but the question is different. What is the difference and what should go in each? If I understand the theory correctly, the query optimizer should be able to use both interchangeably.

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  • How do I create a reusable WF sequential workflow?

    - by djgiard
    I have two customers that have the same workflow (Create file -transport file - wait for response - send response to internal team); however the implementation of each step is different for each customer. For example, one customer requires a flat file to be sent via SFTP, while the other customer requires an XML file to be sent via FTP. I'd like to create a sequential workflow, using Microsoft Workflow Foundation (WF) and reuse this workflow for multiple vendors. Each action's call to an external module can use the same interface, but a different concrete implementation. However, I'm unfamiliar with WF and I'm not sure how to implement this. Can someone point me to the proper way to use this pattern? Will it make a difference whether I choose WF 3.5 or WF 4.0? Thank you.

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  • How do Scala parser combinators compare to Haskell's Parsec?

    - by artif
    I have read that Haskell parser combinators (in Parsec) can parse context sensitive grammars. Is this also true for Scala parser combinators? If so, is this what the "into" (aka "") function is for? What are some strengths/weaknesses of Scala's implementation of parser combinators, vs Haskell's? Do they accept the same class of grammars? Is it easier to generate error messages or do other miscellaneous useful things with one or the other? How does packrat parsing (introduced in Scala 2.8) fit into this picture? Is there a webpage or some other resource that shows how different operators/functions/DSL-sugar from one language's implementation maps onto the other's?

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  • Using Cepstrum for PDA

    - by CziX
    Hey, I am currently deleveloping a algorithm to decide wheather or not a frame is voiced or unvoiced. I am trying to use the Cepstrum to discriminate between these two situations. I use MATLAB for my implementation. I have some problems, saying something generally about the frame, but my currently implementation looks like (I'm award of the MATLAB has the function rceps, but this haven't worked for either): ceps = abs(ifft(log10(abs(fft(frame.*window')).^2+eps))); Can anybody give me a small demo, that will convert the frame to the power cepstrum, so a single lollipop at the pitch frequency. For instance use this code to generate the frequency. fs = 8000; timelength = 25e-3; freq = 500; k = 0:1/fs:timelength-(1/fs); s = 0.8*sin(2*pi*freq*k); Thanks.

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  • Python Bitstream implementations

    - by Danielb
    I am writing a huffman implementation in Python as a learning exercise. I have got to the point of writing out my variable length huffman codes to a buffer (or file). Only to find there does not seem to be a bitstream class implemented by Python! I have had a look at the array and struct modules but they do not seem to do what I need without extra work. A bit of goggling turned up this bitstream implementation, which is more like what I am wanting. Is there really no comparable bitstream class in the Python standard library?

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  • Is this a correct way to host a WCF service?

    - by mafutrct
    For some testing code, I'd like to be able to host a WCF service in only a few lines. I figured I'd write a simple hosting class: public class WcfHost : IDisposable where Implementation : class where Contract : class { public readonly string Address = "net.tcp://localhost:8000/"; private ServiceHost _Host; public WcfHost () { _Host = new ServiceHost (typeof (Implementation)); var binding = new NetTcpBinding (); var address = new Uri (Address); _Host.AddServiceEndpoint ( typeof (Contract), binding, address); _Host.Open (); } public void Dispose () { ((IDisposable) _Host).Dispose (); } } That can be used like this: using (var host = new WcfHost<ImplementationClass, ContractClass> ()) { Is there anything wrong with this approach? Is there a flaw in the code (esp. about the disposing)?

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  • Fast partial sorting algorithm

    - by trican
    I'm looking for a fast way to do a partial sort of 81 numbers - Ideally I'm looking to extract the lowest 16 values (its not necessary for the 16 to be in the absolutely correct order). The target for this is dedicated hardware in an FPGA - so this slightly complicated matters as I want the area of the resultant implementation as small as possible. I looked at and implemented the odd-even merge sort algorithm, but I'm ideally looking for anything that might be more efficient for my needs (trade algorithm implementation size for a partial sort giving lowest 16, not necessarily in order as opposed to a full sort) Any suggestions would be very welcome Many thanks

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  • How to stop IE7 clearing floats because of width property

    - by Andy Hume
    I have a containing element with a number of floated elements in it. That containing element also has a percentage width value applied to it. In IE7, content following the element containing the floats is cleared because of the width value which gives it hasLayout (I think!). I don't want the containing element to haveLayout, but I do need it to have an explicit width. Is there a way of working around this problem in IE7, effectively forcing hasLayout=false.

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