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  • When does a const return type interfere with template instantiation?

    - by Rimo
    From Herb Sutter's GotW #6 Return-by-value should normally be const for non-builtin return types. ... Note: Lakos (pg. 618) argues against returning const value, and notes that it is redundant for builtins anyway (for example, returning "const int"), which he notes may interfere with template instantiation. While Sutter seems to disagree on whether to return a const value or non-const value when returning an object of a non-built type by value with Lakos, he generally agrees that returning a const value of a built-in type (e.g const int) is not a good idea. While I understand why that is useless because the return value cannot be modified as it is an rvalue, I cannot find an example of how that might interfere with template instantiation. Please give me an example of how having a const qualifier for a return type might interfere with template instantiation.

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  • In Python, how to use a C++ function which returns an allocated array of structs via a ** parameter?

    - by Jon-Eric
    I'd like to use some existing C++ code, NvTriStrip, in a Python tool. SWIG easily handles the functions with simple parameters, but the main function, GenerateStrips, is much more complicated. What do I need to put in the SWIG interface file to indicate that primGroups is really an output parameter and that it must be cleaned up with delete[]? /////////////////////////////////////////////////////////////////////////// // GenerateStrips() // // in_indices: input index list, the indices you would use to render // in_numIndices: number of entries in in_indices // primGroups: array of optimized/stripified PrimitiveGroups // numGroups: number of groups returned // // Be sure to call delete[] on the returned primGroups to avoid leaking mem // bool GenerateStrips( const unsigned short* in_indices, const unsigned int in_numIndices, PrimitiveGroup** primGroups, unsigned short* numGroups, bool validateEnabled = false ); FYI, here is the PrimitiveGroup declaration: enum PrimType { PT_LIST, PT_STRIP, PT_FAN }; struct PrimitiveGroup { PrimType type; unsigned int numIndices; unsigned short* indices; PrimitiveGroup() : type(PT_STRIP), numIndices(0), indices(NULL) {} ~PrimitiveGroup() { if(indices) delete[] indices; indices = NULL; } };

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  • why do we have to send the const " type " reference instead of just the types name to the constructo

    - by hamza
    i m trying to make a simple program ( & yes , it is a homework ) that can generate Dates , & like most of normal people : i made my Class attributes private , i tried to send the same type that i m working on to the constructor but the complier have not accept it , i did some research & i found out that in cases like that people generously send a const "type" reference to the constructor witch meant to me that have not understand OOP well so why do we have to send the const " type " reference instead of just the types name to the constructor ? & please give me some links or websites for beginners PS : sorry for my English

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  • Using .Net, how can I determine if a type is a Numeric ValueType?

    - by Nescio
    Title says it all... But here's an example: Dim desiredType as Type if IsNumeric(desiredType) then ... EDIT: I only know the Type, not the Value as a string. Ok, so unfortunately I have to cycle through the TypeCode. But this is a nice way to do it: if ((desiredType.IsArray)) return 0; switch (Type.GetTypeCode(desiredType)) { case 3: case 6: case 7: case 9: case 11: case 13: case 14: case 15: return 1; } ;return 0;

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  • Jquery Serialize data

    - by Richard
    So I have several text boxes, drop down menus, and radio options on this form. When the user clicks submit i want to save ALL that information so I can put it into a database. So this is all the form's inputs <div id="reg2a"> First Name: <br/><input type="text" name="fname" /> <br/> Last Name: <br/><input type="text" name="lname" /> <br/> Address: <br/><input type="text" name="address" /> <br/> City: <br/><input type="text" name="city" /> <br/> State: <br/><input type="text" name="state" /> <br/> Zip Code: <br/><input type="text" name="zip" /> <br/> Phone Number: <br/><input type="text" name="phone" /> <br/> Fax: <br/><input type="text" name="fax" /> <br/> Email: <br/><input type="text" name="email" /> <br/> Ethnicity: <i>Used only for grant reporting purposes</i> <br/><input type="text" name="ethnicity" /> <br/><br/> Instutional Information Type (select the best option) <br/> <select name="iitype"> <option value="none">None</option> <option value="uni">University</option> <option value="commorg">Community Organization</option> </select> <br/><br/> Number of sessions willing to present: <select id="vennum_select" name="vnum"> <?php for($i=0;$i<=3;$i++) { ?> <option value="<?php echo $i ?>"><?php echo $i ?></option> <?php } ?><br/> </select><br/> Number of tables requested: <select id="tabnum_select" name="tnum"> <?php for($i=1;$i<=3;$i++) { ?> <option value="<?php echo $i ?>"><?php echo $i ?></option> <?php } ?> </select><br/><br/> Awarding of a door prize during the conference will result in a reduction in the cost of your first table. <br/><br/> I am providing a door prize for delivery during the conference of $75 or more <select id="prize_select" name="pnum"> <option value="0">No</option> <option value="1">Yes</option> </select><br/> Prize name: <input type="text" name="prize_name" /><br/> Description: <input type="text" name="descr" /><br/> Value: <input type="text" name="retail" /><br/><br/> Name of Institution: <br/><input type="text" name="institution" /> <br/><br/> Type (select the best option) <br/> <select name="type"> <option value="none">None</option> <option value="k5">K-5</option> <option value="k8">K-8</option> <option value="68">6-8</option> <option value="912">9-12</option> </select> <br/><br/> Address: <br/><input type="text" name="address_sch" /> <br/> City: <br/><input type="text" name="city_sch" /> <br/> State: <br/><input type="text" name="state_sch" /> <br/> Zip Code: <br/><input type="text" name="zip_sch" /> <br/> <form name="frm2sub" id="frm2sub" action="page3.php" method="post"> <input type="submit" name="submit" value="Submit" id="submit" /> </form> </div> This is my jquery function: $("#frm2sub").submit( function() { var values = {}; values["fname"] = $("#fname").val(); }); I can do this for each one of the input boxes but I want to give all this data to the next page. So how do I put this array into $_POST? Btw, I've tried doing var data = $("#reg2a").serialize(); and var data = $(document).serialize(); Data ended up being empty. Any ideas? Thanks

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  • What is the 'noreq' Filter Type an Alias for?

    - by Alan Storm
    I'm looking in to Magento's filtering options (Ecommerce System and PHP Framekwork with an expansive ORM system). Specifically the addFieldToFilter method. In this method, you specify a SQLish filter by passing in a single element array, with the key indicating the type of filter. For example, array('eq'=>'bar') //eq means equal array('neq'=>'bar') //neq means not equal would each give you a where clause that looks like where field = 'bar'; where field != 'bar'; So, deep in the bowels of the source, I found a comparison type named 'moreq' that maps to a = comparison operator array('moreq'=>'27') where field >= 27 The weird thing is, there's already a 'gteq' comparision type array('gteq'=>'27') where field >= 27 So, my question is, what does moreq stand for? Is is some special SQL concept that's supported in other databases that the Magento guys wants to map to MySQL, or is it just "more required" and an example what happens when you're doing rapid agile and trying to maintain backwards compatibility.

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  • C# - Custom Attributes - Setting an attribute property to the type of the decorated class.

    - by cmaduro
    Is it possible to get the decorated class' type inside of the custom attribute's class? For example: [MetadataAttribute] [AttributeUsage(AttributeTargets.Class | AttributeTargets.Property, AllowMultiple = false)] public class ViewAttribute : ExportAttribute { public object TargetRegion { get; set; } public Type ViewModel { get; set; } public Type Module { get; set; } public ViewAttribute() : base(typeof(UserControl)) { Module = GetDecoratedClassType(); //I need this method } } In the following example GetDecoratedClassType() would return HomeView [View] HomeView MyHomeView { get; set; }

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  • Using an ObjectCollection as a parameter create a new Control?

    - by Luis
    I was using something like public int Test(System.Windows.Forms.ListBox.ObjectCollection Colecction) { } With this I want to pass just the ObjectCollection of the control, to sort, add and delete elements without passing the entire control, but someone told me that, this way of calling the collection, actualy, create an entire ListBox, making it a worst decition, than, passing a ListBox as a parameter. Is it true? An if, what's the best way of working whit the collection?

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  • Is it possible to override a property and return a derived type in VB.NET?

    - by Casey
    Consider the following classes representing an Ordering system: Public Class OrderBase Public MustOverride Property OrderItem() as OrderItemBase End Class Public Class OrderItemBase End Class Now, suppose we want to extend these classes to a more specific set of order classes, keeping the aggregate nature of OrderBase: Public Class WebOrder Inherits OrderBase Public Overrides Property OrderItem() as WebOrderItem End Property End Class Public Class WebOrderItem Inherits OrderItemBase End Class The Overriden property in the WebOrder class will cause an error stating that the return type is different from that defined in OrderBase... however, the return type is a subclass of the type defined in OrderBase. Why won't VB allow this?

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  • Why does "xsd:date" of XML Schema Type mapped "javax.xml.datatype.XMLGregorianCalendar" When Schema-to-Java Mapping of JAXB does.

    - by Take
    I don't know why does "xsd:date" of XML Schema Type mapped "javax.xml.datatype.XMLGregorianCalendar" When Schema-to-Java Mapping of JAXB does. Why does "xsd:date" of XML Schema Type mapped "java.util.Date" ? I guess that JAXB intentionally does its mapping. I want to know that reason if any. And if exists it, how to change "xsd:date" of XML Schema Type to "java.util.Date" of Java class without using annotation(ex.@XmlJavaTypeAdapter). I want to do mashalling and unmarshalling without all annotations.

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  • Regex: How can I get the parameter from function?

    - by Xi
    Hi there: I am working on getting parameter from a function string. For example, my function is named "translate". So all I need to do is to get everything inbetween "translate(" and ")". Is there a way that i can use regex to do that? So far I have something like: "/translate\((?<keyName>*)\)/i" Unfortunately it's not working. Can anybody help me with this one? Thanks a lot!

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  • How can c let a function declaration with any parameter type ?

    - by kamil çakir
    I forgot to write void parameter but it works the i put void it gives error it lets this: print(int size,int table[size][size]){ int i,j; printf("-------TABLE-------\n"); for(i = 0;i it says"previos implicit declaration was here " (means the call in main) void print(int size,int table[size][size]){ int i,j; printf("-------TABLE-------\n"); for(i = 0;i

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  • Any way to specify a non-positional parameter in a powershell script?

    - by Julian Birch
    I've got the following at the start of a script Param( [string]$command, [string]$version = "1.1.0" ) This is fine, only I need for $version to not be a positional parameter, so that if you type .\script.ps1 run argument Then $args should contain argument and $version should be 1.1.0. Is this even possible? I know I can do it with a c# cmdlet, but it would be massively more convenient if I could deliver this as a single script.

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  • How do you resolve the common naming collision between type and object?

    - by Catskul
    Since the standard c# convention is to capitalize the first letter of public properties, the old c++ convention of initial capital for type names, and initial lowercase for non-type names does not prevent the classic name collision where the most obvious object name matches the type name: class FooManager { public BarManager BarManager { get; set; } // Feels very wrong. // Recommended naming convention? public int DoIt() { // 1st and 2nd Bar Manager are different symbols return BarManager.Blarb + BarManager.StaticBlarb; } } class BarManager { public int Blarb { get; set; } public static int StaticBlarb { get; set; } } It seems to compile, but feels so wrong. Is there a recommend naming convention to avoid this?

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  • How to invoke static method in C#4.0 with dynamic type?

    - by Morgan Cheng
    In C#4.0, we have dynamic type, but how to invoke static method of dynamic type object? Below code will generate exception at run time. class Foo { public static int Sum(int x, int y) { return x + y; } } class Program { static void Main(string[] args) { dynamic d = new Foo(); Console.WriteLine(d.Sum(1, 3)); } } IMHO, dynamic is invented to bridge C# and other programming language. There is some other language (e.g. Java) allows to invoke static method through object instead of type. BTW, The introduction of C#4.0 is not so impressive compared to C#3.0.

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  • How to save derived type (TPT) in Entity Framework?

    - by Peter Stegnar
    I have problems with saving derived type (TPT) with Entity Framework to database. Let's say I have base entity Animal and derived type Dog. I want to save Dog entity. I thought that I could do it like contex.AddToDogs(), but contex contain only base entity - Animal. So I can only save Animal object - contex.AddToAnimals(). I have also tried with contex.AddObject("Animals", dogInstance), but I get the following error: The member with identity 'NavigationProperty' does not exist in the metadata collection. But I have add EntityReference to the "NavigationProperty". So how to save derived type in EF?

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  • F#: Can't hide a type abbreviation in a signature? Why not?

    - by Nels Beckman
    In F#, I'd like to have what I see as a fairly standard Abstract Datatype: // in ADT.fsi module ADT type my_Type // in ADT.fs module ADT type my_Type = int In other words, code inside the module knows that my_Type is an int, but code outside does not. However, F# seems to have a restriction where type abbreviations specifically cannot be hidden by a signature. This code gives a compiler error, and the restriction is described here. If my_Type were instead a discriminated union, then there is no compiler error. My question is, why the restriction? I seem to remember being able to do this in SML and Ocaml, and furthermore, isn't this a pretty standard thing to do when creating an abstract datatype? Thanks

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  • How to pass PHP array parameter to Javascript Function???

    - by Son of Man
    index.php <script type="text/javascript" src="javascript.js"> </script> <?php $movies = array("Bloodsport", "Kickboxer", "Cyborg", "Timecop", "Universal Soldier", "In Hell", "The Quest"); ?> <input type="submit" value="Test Javascript" onclick="showMovies(<?php echo $movies; ?>);" /> javascript.js function showMovies(movies) { alert(movies.length); return false; } I am new to programming so Im having hard time fixing this one which is obviously simple for you guys. When I hit the submit button it says the that the array size is 1 which I think should be 7. How could this be??? Pls tell me what to do... Thanks in Advance...

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  • Dynamic parameters for XSLT 2.0 group-by

    - by Ophileon
    I got this input <?xml version="1.0" encoding="UTF-8"?> <result> <datapoint poiid="2492" period="2004" value="1240"/> <datapoint poiid="2492" period="2005" value="1290"/> <datapoint poiid="2492" period="2006" value="1280"/> <datapoint poiid="2492" period="2007" value="1320"/> <datapoint poiid="2492" period="2008" value="1330"/> <datapoint poiid="2492" period="2009" value="1340"/> <datapoint poiid="2492" period="2010" value="1340"/> <datapoint poiid="2492" period="2011" value="1335"/> <datapoint poiid="2493" period="2004" value="1120"/> <datapoint poiid="2493" period="2005" value="1120"/> <datapoint poiid="2493" period="2006" value="1100"/> <datapoint poiid="2493" period="2007" value="1100"/> <datapoint poiid="2493" period="2008" value="1100"/> <datapoint poiid="2493" period="2009" value="1110"/> <datapoint poiid="2493" period="2010" value="1105"/> <datapoint poiid="2493" period="2011" value="1105"/> </result> and I use this xslt 2.0 <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="xs" version="2.0"> <xsl:output method="xml" indent="yes"/> <xsl:template match="result"> <xsl:for-each-group select="datapoint" group-by="@poiid"> <node type="poiid" id="{@poiid}"> <xsl:for-each select="current-group()"> <node type="period" id="{@period}" value="{@value}"/> </xsl:for-each> </node> </xsl:for-each-group> </xsl:template> </xsl:stylesheet> to convert it into <?xml version="1.0" encoding="UTF-8"?> <node type="poiid" id="2492"> <node type="period" id="2004" value="1240"/> <node type="period" id="2005" value="1290"/> <node type="period" id="2006" value="1280"/> <node type="period" id="2007" value="1320"/> <node type="period" id="2008" value="1330"/> <node type="period" id="2009" value="1340"/> <node type="period" id="2010" value="1340"/> <node type="period" id="2011" value="1335"/> </node> <node type="poiid" id="2493"> <node type="period" id="2004" value="1120"/> <node type="period" id="2005" value="1120"/> <node type="period" id="2006" value="1100"/> <node type="period" id="2007" value="1100"/> <node type="period" id="2008" value="1100"/> <node type="period" id="2009" value="1110"/> <node type="period" id="2010" value="1105"/> <node type="period" id="2011" value="1105"/> </node> Works smoothly. Where I got stuck is when I tried to make it more dynamic. The real life input has 6 attributes for each datapoint instead of 3, and the usecase requires the possibility to set the grouping parameters dynamically. I tried using parameters <xsl:param name="k1" select="'poiid'"/> <xsl:param name="k2" select="'period'"/> but passing them to the rest of the xslt is something that I can't get right. The code below doesn't work, but clarifies hopefully, what I'm looking for. <xsl:template match="result"> <xsl:for-each-group select="datapoint" group-by="@{$k1}"> <node type="{$k1}" id="@{$k1}"> <xsl:for-each select="current-group()"> <node type="{$k2}" id="@{$k2}" value="{@value}"/> </xsl:for-each> </node> </xsl:for-each-group> </xsl:template> Any help appreciated..

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  • How can I receive the "scroll box" type scroll events from a DataGridView?

    - by Simon
    I have a DataGridView, and I'm listening to its Scroll event. This gives me a ScrollEventArgs object whose Type member is supposed to tell me the type of scroll event that has occurred. On the MSDN documentation page it says I should be able to detect movement of the scroll box by listening for events with types ThumbPosition, ThumbTrack, First, Last and EndScroll. However, when I drag the scroll box, I only get events of type LargeDecrement and LargeIncrement. How do I get access to the ThumbPosition, ThumbTrack, First, Last and EndScroll events?

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  • c#: can you use a boolean predicate as the parameter to an if statement?

    - by Craig Johnston
    In C#, can you use a boolean predicate on its own as the parameter for an if statement? eg: string str = "HELLO"; if (str.Equals("HELLO")) { Console.WriteLine("HELLO"); } Will this code output "HELLO", or does it need to be: string str = "HELLO"; if (str.Equals("HELLO") == true) { Console.WriteLine("HELLO"); } If there is anything else wrong with the above code segments, please point it out.

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  • How can I check the type of an object against a list of types?

    - by RookieRick
    Given a collection IEnumerable<Type> supportedTypes What's the best way to check whether a given object is one of those types (or a derived type)? My first instinct was to do something like: // object target is a parameter passed to the method in which I'm doing this. if (supportedTypes.Count( supportedType => target is supportedType ) > 0) { // Yay my object is of a supported type!!! } ..but that doesn't seem to be working. Can I not use the "is" keyword in a lambda expression like this?

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