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  • When to address managed heap fragmentation

    - by emddudley
    I was reading a blog entry by Josh Smith where he used a cache mechanism in order to "reduce managed heap fragmentation". His caching reduces the number of short-lived objects being created at the cost of slightly slower execution speed. How much of a problem is managed heap fragmentation in a managed language like C#? How can you diagnose if it's an issue? In what situations would you typically need to address it?

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  • generating program structure (nodes) using bison and flex

    - by gruszczy
    I would like to write myself a pretty printer for java using bison and flex. I have written a pretty printer for a script language, but I was only writing visitors, which made the printing. How can I turn a program using my formal grammar into a tree of nodes (made using C++ classes), that afterwards I could visit using my visitor? Maybe you could give me some link with an example of this? What i need to put into flex/bison files?

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  • Deserializing classes from XML generated using XSD.exe

    - by heap
    I have classes generated (using xsd.exe) from an .xsd that I can serialize just fine, but when I try and deserialize it, I get the error: {"<XMLLanguages xmlns='http://tempuri.org/XMLLanguages.xsd'> was not expected."} I've searched for a couple of hours and found most peoples problems lie in not declaring namespaces in their xsd/xml, not defining namespaces in their classes, etc, but I can't find a solution for my problem. Here are code snippets for the relevant classes. <?xml version="1.0" encoding="utf-8"?> <xs:schema id="SetupData" targetNamespace="http://tempuri.org/XMLLanguages.xsd" elementFormDefault="qualified" xmlns="http://tempuri.org/XMLLanguages.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema" > <xs:element name="XMLLanguages"> <xs:complexType> <xs:sequence> <xs:element name="Tier" minOccurs="1" maxOccurs="unbounded"> <xs:complexType> <xs:sequence> <xs:element name="L" minOccurs="1" maxOccurs="unbounded" type="Language"/> </xs:sequence> <xs:attribute name="TierID" type="xs:int"/> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element> <xs:complexType name="Language"> <xs:sequence> <xs:element name="LangID" type="xs:int"/> <xs:element name="Tier" type="xs:int"/> <xs:element name ="Name" type="xs:string"/> </xs:sequence> <xs:attribute name ="PassRate" type="xs:int"/> </xs:complexType> </xs:schema> And the class: /// <remarks/> [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "4.0.30319.1")] [System.SerializableAttribute()] [System.Diagnostics.DebuggerStepThroughAttribute()] [System.ComponentModel.DesignerCategoryAttribute("code")] [System.Xml.Serialization.XmlTypeAttribute(Namespace = "http://tempuri.org/XMLLanguages.xsd")] [System.Xml.Serialization.XmlRootAttribute(Namespace = "http://tempuri.org/XMLLanguages.xsd", IsNullable = false)] public partial class XMLLanguages { private List<XMLLanguagesTier> tierField; /// <remarks/> [System.Xml.Serialization.XmlElementAttribute("Tier")] public List<XMLLanguagesTier> Tiers { get { return this.tierField; } set { this.tierField = value; } } } And a the line in XML causing the error: <XMLLanguages xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://tempuri.org/XMLLanguages.xsd">

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  • how to display formatted text but have the actual text

    - by Behrooz
    hello I have my own textbox witch inherits System.Windows.Forms.TextBox I am trying to display texts like 5000000 formatted == 5,000,000 but the problem is that Control.Text should return 5000000 but it should display 5,000,000. I know it is WTF, but i really need it and i couldn't Google a lot because my native language is not English(and anyone can get it from my grammar and Im sorry for that).

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  • how to use quad core CPU in application

    - by Mayank
    For using all the cores of a quad core processor what do I need to change in my code is it about adding support of multi threading or is it which is taken care by OS itself. I am having FreeBSD and language I am using is C++. I want to give complete CPU cycles to my application at least 90%.

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  • Allocated memory address clash

    - by Louis
    Hi, i don't understand how this happen. This is portion of my code.. int isGoal(Node *node, int startNode){ int i; . . } When i debug this using gdb i found out that 'i' was allocated at the memory address that have been previously allocated. (gdb)print &node->path->next $26 = (struct intNode **) 0xffbff2f0 (gdb) print &i $22 = (int *) 0xffbff2f0 node-path-next has been already defined outside this function. But as u can see they share the same address which at some point make the pointer point to another place when the i counter is changed. I compiled it using gcc on solaris platform Any helps would be really appreciated..

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  • GCD function in matlab

    - by SalemFayad
    hi, i am looking for a way to implement the "gcd" function used in matlab in another language but i really cant understand the way it functions. it says in http://www.mathworks.com/access/helpdesk/help/techdoc/ref/gcd.html that: "[G,C,D] = gcd(A,B) returns both the greatest common divisor array G, and the arrays C and D, which satisfy the equation: A(i).*C(i) + B(i).*D(i) = G(i)." but it says nothing about how it calculates C and D. i would be grateful if someone has a clearer idea about this subject! thanks:)

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  • How to set up Flex Unit 4

    - by macke
    Does anyone know of any guides or any sort of documentation on how to set up the new Flex Builder 4 beta? I've been pulling my hair all day long, none of my tests are executed and I can't for the life of me understand what's wrong. There are no errors at all. It's as if the metadata tags are not recognized, is there some special compiler argument to recognize them? I seem to remember that this is not necessary as long as the swc files that are included were compiled with said arguments. I'm using Beta 1 of Flex Unit 4 which can be found here: http://opensource.adobe.com/wiki/display/flexunit/FlexUnit+4+feature+overview I'm actually using the very same code that is included with that package to run the tests, but no tests are executed. Neither mine nor the ones included in the FU4 package. The lack of documentation certainly doesn't help much...

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  • Catching typos in scripting languages

    - by Geo
    If your scripting language of choice doesn't have something like Perl's strict mode, how are you catching typos? Are you unit testing everything? Every constructor, every method? Is this the only way to go about it?

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  • SQL CE not loading from network share

    - by David Veeneman
    I installed VS 2010 RC yesterday, and suddenly, SQL Server CE isn't loading files from a network share. In projects compiled with VS 2008, if I try to open a SQL CE file located on a network share, I get an error that reads like this: Internal error: Cannot open the shared memory region. If I try to create a data connection in VS 2010 to a SQL CE file on a network share, I get this error: SQL Server Compact does not support opening database files on a network share. Can anyone shed any light on what's going on? Thanks.

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  • what is the difference between declarative and imperative programming

    - by Brad
    I have been searching the web looking for a definition for declarative and imperative programming that would shed some light for me. However the language used at some of the resources that I have found is daunting - for instance at wikipedia. Does any one have a real world example that they could show me that might bring some perspective to this subject...perhaps in c# thanks

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  • Enable PostBack for a ASP.NET User Control

    - by Steven
    When I click my "Query" the values for my user controls are reset. How do I enable PostBack for my user control? myDatePicker.ascx <%@ Control Language="vb" CodeBehind="myDatePicker.ascx.vb" Inherits="Website.myDate" AutoEventWireup="false" %> <%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="asp" %> <asp:TextBox ID="DateTxt" runat="server" ReadOnly="True" /> <asp:Image ID="DateImg" runat="server" ImageUrl="~/Calendar_scheduleHS.png" EnableViewState="True" EnableTheming="True" /> <asp:CalendarExtender ID="DateTxt_CalendarExtender" runat="server" Enabled="True" TargetControlID="DateTxt" PopupButtonID="DateImg" DefaultView="Days" Format="ddd MMM dd, yyyy" EnableViewState="True"/> myDatePicker.ascx Partial Public Class myDate Inherits System.Web.UI.UserControl Public Property SelectedDate() As Date? Get Dim o As Object = ViewState("SelectedDate") If o = Nothing Then Return Nothing End If Return Date.Parse(o) End Get Set(ByVal value As Date?) ViewState("SelectedDate") = value End Set End Property End Class Default.aspx <%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="Website._Default" EnableEventValidation="false" EnableViewState="true" %> <%@ Register TagPrefix="my" TagName="DatePicker" Src="~/myDatePicker.ascx" %> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajax" %> <%@ Register Assembly="..." Namespace="System.Web.UI.WebControls" TagPrefix="asp" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> ... <body> <form id="form1" runat="server"> <div class="mainbox"> <div class="query"> Start Date<br /> <my:DatePicker ID="StartDate" runat="server" EnableViewState="True" /> End Date <br /> <my:DatePicker ID="EndDate" runat="server" EnableViewState="True" /> ... <div class="query_buttons"> <asp:Button ID="Button1" runat="server" Text="Query" /> </div> </div> <asp:GridView ID="GridView1" ... > </form> </body> </html> Default.aspx.vb Imports System.Web.Services Imports System.Web.Script.Services Imports AjaxControlToolkit Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles Me.Load End Sub Partial Public Class _Default Inherits System.Web.UI.Page Protected Sub Button1_Click(ByVal sender As Object, _ ByVal e As EventArgs) Handles Button1.Click GridView1.DataBind() End Sub End Class

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  • How to start on programming?

    - by Stustu
    At an old age I decided to start programming. I'm fascinated with graphics and web development. I understand general concepts of programming, like loops, functions etc. Which is the language to learn? How to start?

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  • How to Retrieve Method's Signature in Squeak

    - by Artium
    printThisMethodSig: aSomething stack := thisContext stackOfSize: 2. Transcript show: (stack at: 2); cr. stack at: 2 returns the method context of the current method. It is possible to retrieve the compiled method of the current method using method message. I want to be able to print the whole signature of the method, for example: from:to:. I looked at both MethodContext and CompiledMethod classes but could not find out how to do it. Thank you.

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  • RubyCocoa, what's the point?

    - by totocaster
    I was wondering what's the point of using Ruby (or even Python) in Cocoa application development other that not learning Objective-C (which is pretty simple language and will not take to more than few days to learn). I'm new to this and I'm interested why people do this? What are Pros and Cons.

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  • How to get Netty websocket client example working

    - by Paul Butcher
    I'm struggling to get the netty example websocket client working. I've compiled successfully with 4.0.0.Alpha8, but when I try to connect to a server (also a netty example) I get: Exception in thread "main" io.netty.handler.codec.http.websocketx.WebSocketHandshakeException: Invalid handshake response upgrade: websocket at io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker13.finishHandshake(WebSocketClientHandshaker13.java:204) which makes no sense to me whatsoever, given that this piece of code reads: String upgrade = response.getHeader(Names.UPGRADE); if (!Values.WEBSOCKET.equalsIgnoreCase(upgrade)) { throw new WebSocketHandshakeException("Invalid handshake response upgrade: " + response.getHeader(Names.UPGRADE)); } And as the message in the exception demonstrates, the Upgrade header does contain websocket as expected. Any idea what's going on?

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  • product suggestion based on user data

    - by Enkay
    I'm trying to add suggestions to product pages along the lines of : "Customers who purchased this item also purchased x and y". The way the data is compiled right now is a mysql table with 3 rows. PRODUCT | CUSTOMER |QUANTITY Product is the product ID. Customer is the customer ID. Quantity is the number of time that product was bought by that customer. For each product description page, the system needs to figure out which users bought that product, what other products those users bought, in what quantity and then return the 2 products that were bought the most by people who bought the current product. Hopefully this makes sense and someone can point me in the right directions as to what the mysql query should look like. Thanks.

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  • Automatic translation from fortran 90 to f77

    - by osgx
    Hello Is there an converter from fortran 90 downto fortran 77 ? I have a fortran77 only compiler and want to run NAS Parallel Benchmark (NPB for short) on it. But NPB uses some features of F90, like do enddo, smth else. All features are rather simple. Is there A way to translate NPB to F77 strict language? Tags: fortran parallel convert programming-languages

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  • Static Class Variables in Dynamic Library and Main Program

    - by Paul
    I am working on a project that has a class 'A' that contains a static stl container class. This class is included in both my main program and a .so file. The class uses the default(implicit, not declared) constructor/destructor. The main program loads the .so file using dlopen() and in its destructor, calls dlclose(). The program crashes after main exits when glibc calls the destructor for the static class member variable. The problem appears to be that when dlclose() is called, the destructor for the static variable is called, then when main exits() glibc also calls the destructor, resulting in a double free. I have 2 questions, namely: 1) In this particular case, why are there not two copies of the static variable(yes i know that sounds somewhat ridiculous, but since both the main program and .so file have a separately compiled 'A', shouldn't they each have one?) 2) Is there any way to resolve this issue without re-writing class 'A' to not contain static member variables?

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  • How can ported code be detected?

    - by NiallJG
    If you port code over from one language to another, how can this be detected? Say you were porting code from c++ to Java, how could you tell? What would be the difference between a program designed and implemented in Java, and a near identical program ported over to Java?

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  • Software Engineering Papers

    - by kunjaan
    Please recommend me software engineering/methodology/practices paper. So far I have enjoyed: 1968 Dijkstra : Go To Statement Considered Harmful Nikalus Wirth : Program Development by Stepwise Refinement 1971 David Parnas : Information Distribution Aspects of Design Methodology 1972 Liskov : Design Methodology for Reliable Software Systems Extensible Language : Schuman and P Jourrand R. Balzer Structured Programming : Dahl - Hierarchical Program StructuresImplementation Patterns 1971 Jim Morris Protection in Programming Languages 1973 Bill Wulf and Mary Shaw Global Variable Considered Harmful 1974 : Lisko and Zilles ADTs

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