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  • Quicksort causes stackoverflow...

    - by Tony
    I have the following code, (taken from here), but it causes a stackoverflow exception when there's two the same value's in the list to sort. Can someone help me what's causing this? public static IEnumerable<int> QSLinq(IEnumerable<int> _items) { if (_items.Count() <= 1) return _items; var _pivot = _items.First(); var _less = from _item in _items where _item < _pivot select _item; var _same = from _item in _items where _item == _pivot select _item; var _greater = from _item in _items where _item > _pivot select _item; return QSLinq(_less).Concat(QSLinq(_same)).Concat(QSLinq(_greater)); }

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  • Join one row to multiple rows in another table

    - by Ghostrider
    I have a table to entities (lets call them people) and properties (one person can have an arbitrary number of properties). Ex: People Name Age -------- Jane 27 Joe 36 Jim 16 Properties Name Property ----------------- Jane Smart Jane Funny Jane Good-looking Joe Smart Joe Workaholic Jim Funny Jim Young I would like to write an efficient select that would select people based on age and return all or some of their properties. Ex: People older than 26 Name Properties Jane Smart, Funny, Good-looking Joe Smart, Workaholic It's also acceptable to return one of the properties and total property count. The query should be efficient: there are millions of rows in people table, hundreds of thousands of rows in properties table (so most people have no properties). There are hundreds of rows selected at a time. Is there any way to do it?

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  • itextsharp PdfCopy and landscape pages

    - by Andreas Rehm
    I'm using itextsharp to join mutiple pdf documents and add a footer. My code works fine - except for landscape pages - it isn't detecting the page rotation - the footer is not centerd for landscape: public static int AddPagesFromStream(Document document, PdfCopy pdfCopy, Stream m, bool addFooter, int detailPages, string footer, int footerPageNumOffset, int numPages, string pageLangString, string printLangString) { CreateFont(); try { m.Seek(0, SeekOrigin.Begin); var reader = new PdfReader(m); // get page count var pdfPages = reader.NumberOfPages; var i = 0; // add pages while (i < pdfPages) { i++; // import page with pdfcopy var page = pdfCopy.GetImportedPage(reader, i); // get page center float posX; float posY; var rotation = page.BoundingBox.Rotation; if (rotation == 0 || rotation == 180) { posX = page.Width / 2; posY = 0; } else { posX = page.Height / 2; posY = 20f; } var ps = pdfCopy.CreatePageStamp(page); var cb = ps.GetOverContent(); // add footer cb.SetColorFill(BaseColor.WHITE); var gs1 = new PdfGState {FillOpacity = 0.8f}; cb.SetGState(gs1); cb.Rectangle(0, 0, document.PageSize.Width, 46f + posY); cb.Fill(); // Text cb.SetColorFill(BaseColor.BLACK); cb.SetFontAndSize(baseFont, 7); cb.BeginText(); // create text var pages = string.Format(pageLangString, i + footerPageNumOffset, numPages); cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, printLangString, posX, 40f + posY, 0f); cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, footer, posX, 28f + posY, 0f); cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, pages, posX, 20f + posY, 0f); cb.EndText(); ps.AlterContents(); // add page to new pdf pdfCopy.AddPage(page); } // close PdfReader reader.Close(); // return number of pages return i; } catch (Exception e) { Console.WriteLine(e); return 0; } } How do I detect the page rotation (e.g. landscape) format in this case? The given example works for PdfReader but not for PdfCopy. Edit: Why do I need PdfCopy? I tried copying a word pdf export. Some word hyperlinks will not work when you try to copy pages with PdfReader. Only PdfCopy transfers all needed page informations. Edit: (SOLVED) You need to use reader.GetPageRotation(i);

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  • If you are forced to use an Anemic domain model, where do you put your business logic and calculated

    - by Jess
    Our current O/RM tool does not really allow for rich domain models, so we are forced to utilize anemic (DTO) entities everywhere. This has worked fine, but I continue to struggle with where to put basic object-based business logic and calculated fields. Current layers: Presentation Service Repository Data/Entity Our repository layer has most of the basic fetch/validate/save logic, although the service layer does a lot of the more complex validation & saving (since save operations also do logging, checking of permissions, etc). The problem is where to put code like this: Decimal CalculateTotal(LineItemEntity li) { return li.Quantity * li.Price; } or Decimal CalculateOrderTotal(OrderEntity order) { Decimal orderTotal = 0; foreach (LineItemEntity li in order.LineItems) { orderTotal += CalculateTotal(li); } return orderTotal; } Any thoughts?

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  • MVC Partial View Not Refreshing when using JSON data

    - by 40-Love
    I have a dropdown that I'm using to refresh a div with checkboxes. I am trying to figure out why my view is not refreshing if I pass in data in JSON format. If I pass in just a regular string, the view refreshes. If I pass in JSON data, the view does not refresh. If I step through the code in the Partial view, I can see the correct number of records are being passed in, however the view doesn't get refreshed with the correct number of checkboxes. I tried to add some cache directives, it didn't work. This doesn't work: $(function () { $('#ddlMoveToListNames').change(function () { var item = $(this).val(); var selectedListID = $('#ddlListNames').val(); var checkValues = $('input[name=c]:checked').map(function () { return $(this).val(); }).toArray(); $.ajax({ url: '@Url.Action("Test1", "WordList")', type: 'POST', cache: false, data: JSON.stringify({ words: checkValues, moveToListID: item, selectedListID: selectedListID }), dataType: 'json', contentType: 'application/json; charset=utf-8', success: function (result) { } }) .done(function (partialViewResult) { $("#divCheckBoxes").replaceWith(partialViewResult); }); }); }); This works: $(function () { $('#ddlMoveToListNames').change(function () { var item = $(this).val(); var selectedListID = $('#ddlListNames').val(); var checkValues = $('input[name=c]:checked').map(function () { return $(this).val(); }).toArray(); $.ajax({ url: '@Url.Action("Test1", "WordList")', type: 'POST', cache: false, data: { selectedListID: item }, success: function (result) { } }) .done(function (partialViewResult) { $("#divCheckBoxes").replaceWith(partialViewResult); }); }); }); Partial View: @model WLWeb.Models.MyModel <div id="divCheckBoxes"> @foreach (var item in Model.vwWordList) { @Html.Raw("<label><input type='checkbox' value='" + @Html.DisplayFor(modelItem => item.Word) + "' name='c'> " + @Html.DisplayFor(modelItem => item.Word) + "</label>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"); } </div> Controller: [AcceptVerbs(HttpVerbs.Post)] [OutputCache(NoStore = true, Duration = 0, VaryByParam = "*")] public PartialViewResult Test1(MyModel vm, string[] words, string moveToListID, string selectedListID) { int listNameID = Convert.ToInt32(moveToListID); List<vwWordList> lst = db.vwWordLists.Where(s => s.Word.StartsWith("wa") && s.ListID == listNameID).ToList(); vm.vwWordList = lst; return PartialView("Partial1", vm); } View: @Html.DropDownListFor(x => Model.FilterViewModel.MoveToListNameID, Model.FilterViewModel.MoveToListNameList, new { @id = "ddlMoveToListNames", style = "width:100px;" })

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  • REST: Should I redirect to the version URL of an entity?

    - by sfussenegger
    I am currently working on a REST service. This service has an entity which has different versions, similar to Wikipedia articles. Now I'm wondering what I should return if for GET /article/4711 Should I use a (temporary) redirect to the current version, e.g. GET /article/4711/version/7 Or should I return the current version directly? Using redirects would considerably simplify HTTP caching (using Last-Modified) but has the disadvantages a redirect has (extra request, 'harder' to implement). Therefore I'm not sure whether this is good practice though. Any suggestions, advise, or experiences to share? (btw: ever tried search for "REST Version"? Everything you get is about the version of the API rather than entities. So please bear with me if this is a duplicate.)

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  • How to dynamically replace a method implementation in ObjC2?

    - by Abhi
    I am trying to learn how to write plugins using SIMBL. I got my plugin to load with the target application, and also know the method that I wish to override. However, I am not able to use class_getInstanceMethod correctly based on snippets on the Internet. Have things changed in OSX 10.6 and/or ObjC2? The following code from culater.net gives "Dereferencing pointer to incomplete type" on the second-last statement: BOOL DTRenameSelector(Class _class, SEL _oldSelector, SEL _newSelector) { Method method = nil; // First, look for the methods method = class_getInstanceMethod(_class, _oldSelector); if (method == nil) return NO; method->method_name = _newSelector; return YES; } Is there a complete example of how to override a method using SIMBL plugins? Thanks!

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  • how to read element when we have multiple class in jquery

    - by pritisolanki
    Hi, I have a multiple div almost more than 50 and there are some div with class "holiday" Example: <div class="fc-event fc-event-vert fc-corner-top fc-corner-bottom **holiday**" style="position: absolute; z-index: 8; top: 0px; left: 61px; width: 71px; height: 40px;">content</div> I am trying to identify this div in jquery and modify the width from 71 to 80 px .. i tried $('div.holiday') it return object but when i try $('div.holiday').attr('width') it return undefined... Can someone help me in this how i can resolve this issue. Regards Priti

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  • How to get ouput from expect

    - by Mallikarjunarao
    i wrote a script for spawing the bc command package require Expect proc bc {eq} { spawn e:/GnuWin32/bc/bin/bc send "$eq\r" expect -re "(.*)\r" return "$expect_out(0,string)" } set foo "9487294387234/sqrt(394872394879847293847)" puts "the valule [bc $foo]" how to get the output from this. When i am running this one i get ouput like this bc 1.06 Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc. This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. 9487294387234/sqrt(394872394879847293847) 477 can't read "expect_out(0,string)": no such element in array while executing "return "The values is $expect_out(0,string)"" (procedure "bc" line 6) invoked from within "bc $foo" invoked from within "puts "the valule [bc $foo]"" (file "bc.tcl" line 21) how to resolve this one.

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  • How can I configure a Factory with the possible providers?

    - by Jonathas Costa
    I have three assemblies: "Framework.DataAccess", "Framework.DataAccess.NHibernateProvider" and "Company.DataAccess". Inside the assembly "Framework.DataAccess", I have my factory (with the wrong implementation of discovery): public class DaoFactory { private static readonly object locker = new object(); private static IWindsorContainer _daoContainer; protected static IWindsorContainer DaoContainer { get { if (_daoContainer == null) { lock (locker) { if (_daoContainer != null) return _daoContainer; _daoContainer = new WindsorContainer(new XmlInterpreter()); // THIS IS WRONG! THIS ASSEMBLY CANNOT KNOW ABOUT SPECIALIZATIONS! _daoContainer.Register( AllTypes.FromAssemblyNamed("Company.DataAccess") .BasedOn(typeof(IReadDao<>)).WithService.FromInterface(), AllTypes.FromAssemblyNamed("Framework.DataAccess.NHibernateProvider") .BasedOn(typeof(IReadDao<>)).WithService.Base()); } } return _daoContainer; } } public static T Create<T>() where T : IDao { return DaoContainer.Resolve<T>(); } } This assembly also defines the base interface for data access IReadDao: public interface IReadDao<T> { IEnumerable<T> GetAll(); } I want to keep this assembly generic and with no references. This is my base data access assembly. Then I have the NHibernate provider's assembly, which implements the above IReadDao using NHibernate's approach. This assembly references the "Framework.DataAccess" assembly. public class NHibernateDao<T> : IReadDao<T> { public NHibernateDao() { } public virtual IEnumerable<T> GetAll() { throw new NotImplementedException(); } } At last, I have the "Company.DataAccess" assembly, which can override the default implementation of NHibernate provider and references both previously seen assemblies. public interface IProductDao : IReadDao<Product> { Product GetByName(string name); } public class ProductDao : NHibernateDao<Product>, IProductDao { public override IEnumerable<Product> GetAll() { throw new NotImplementedException("new one!"); } public Product GetByName(string name) { throw new NotImplementedException(); } } I want to be able to write... IRead<Product> dao = DaoFactory.Create<IRead<Product>>(); ... and then get the ProductDao implementation. But I can't hold inside my base data access any reference to specific assemblies! My initial idea was to read that from a xml config file. So, my question is: How can I externally configure this factory to use a specific provider as my default implementation and my client implementation?

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  • Handling exception form unmanaged dll in C#

    - by StuffHappens
    Hello. I have the following function written in C# public static string GetNominativeDeclension(string surnameNamePatronimic) { if(surnameNamePatronimic == null) throw new ArgumentNullException("surnameNamePatronimic"); IntPtr[] ptrs = null; try { ptrs = StringsToIntPtrArray(surnameNamePatronimic); int resultLen = MaxResultBufSize; int err = decGetNominativePadeg(ptrs[0], ptrs[1], ref resultLen); ThrowException(err); return IntPtrToString(ptrs, resultLen); } catch { return surnameNamePatronimic; } finally { FreeIntPtr(ptrs); } } Function decGetNominativePadeg is in unmanaged dll [DllImport("Padeg.dll", EntryPoint = "GetNominativePadeg")] private static extern Int32 decGetNominativePadeg(IntPtr surnameNamePatronimic, IntPtr result, ref Int32 resultLength); and throws an exception: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. The catch that is in C# code doesn't actually catch it. Why? How to handle this exception? Thank you for your help!

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  • How do I call overloaded Java methods in Clojure.

    - by Pat Wallace
    For this example Java class: package foo; public class TestInterop { public String test(int i) { return "Test(int)"; } public String test(Object i) { return "Test(Object)"; } } When I start Clojure and try to call the test(int) method, the test(Object) method is called instead, because Clojure automatically boxes the integer into a java.lang.Integer object. How do I force Clojure to call the test(int) method? user=> (.test (new foo.TestInterop) 10) "Test(Object)" I want to call methods like Component.add(Component comp, int index) in AWT, but instead keep calling add(Component comp, Object constraints), so the buttons on my toolbar always appear in the wrong order.

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  • Which are your favorite programming language gadgets?

    - by FerranB
    There are some gadgets/features for programming languages that I like a lot because they save a lot of coding or simply because they are magical or nice. Some of my favorites are: C++ increment/decrement operator: my_array[++c]; C++ assign and sum or substract (...): a += b C# yield return: yield return 1; C# foreach: foreach (MyClass x in MyCollection) PLSQL for loop: for c in (select col1, col2 from mytable) PLSQL pipe row: for i in 1..x loop pipe row(i); end loop; Python Array access operator: a[:1] PLSQL ref cursors. Which are yours?

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  • Problem with Scrolling UITableView

    - by HiGuy Smith
    Hello, I have a navigation-based application that has a scrolling UITableView filled with the contents of a directory. Somehow, when I try to scroll a new cell into view, the application crashes. I have determined that it goes down to these lines of code in - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {: NSString *cellText = [contentArray objectAtIndex:indexPath.row]; cell.textLabel.text = cellText; Now why this is crashing, I don't know. contentArray is a NSArray with the table data. If you need a bit more code to tell: - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [contentArray count]; } Please help me with this problem, HiGuy

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  • iPhone TabBar selection cancelling

    - by Chris Schnyder
    I am developing an iPhone app that displays several views, all acessed via Tab Bar items. However I need to add an additional item to the Tab Bar that simply launches a URL in Safari. I've accomplished this by adding an empty placeholder view to the TabBar and returning FALSE from shouldSelectViewController when the this view's tabBarItem is clicked on, and launching Safari at the same time. That code is: - (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController { if([[viewController tabBarItem] title] == "Website"){ //... launch Safari return FALSE; } else { return TRUE; } } PROBLEM: If the TabBar has too many items, and this "Safari Launch" tab is pushed off to the "More" navigation controller, I lose the capability to intercept the event and prevent the view from loading when clicked. Any suggested tips?

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  • LINQ DataLoadOptions - Retrieval of data via Fulltext/Broken Foreign Key Relationship

    - by Alex
    I've hit a brick wall: I have an SQL Function: FUNCTION [dbo].[ContactsFTS] (@searchtext nvarchar(4000)) RETURNS TABLE AS RETURN SELECT * FROM Contacts INNER JOIN CONTAINSTABLE(Contacts, *, @searchtext) AS KEY_TBL ON Contacts.Id = KEY_TBL.[KEY] which I am calling via LINQ public IQueryable<ContactsFTSResult> SearchByFullText(String searchText) { return db.ContactsFTS(searchText); } I am projecting the ContactsFTSResult collection into a List<Contact> which is then given to my viewmodel. Here is the problem: My Contacts table (and therefore the Contact object created via LINQ to SQL) has multiple FK relationships to other information, such as Contact.BillingAddressId is an FK to an Address.Id. That information is missing after I do the fulltext search (e.g. if I try to access Contact.BillingAddress it is null). Can I add this information somehow via DataLoadOptions? I tried LoadWith<Contact>(c => c.BillingAddress) but this doesn't work, I assume because of the fact that I'm calling the function instead of doing the whole query via LINQ.

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  • How do I setup a Criteria in nHibernate to query against multiple values

    - by AWC
    I want to query for a set of results based on the contents of a list, I've managed to do this for a single instance of the class Foo, but I'm unsure how I would do this for a IList<Foo>. So for a single instance of the class Foo, this works: public ICriteria CreateCriteria(IList<Foo> foo) { return session .CreateCriteria<Component>() .CreateCriteria("Versions") .CreateCriteria("PublishedEvents") .Add(Restrictions.And(Restrictions.InsensitiveLike("Name", foo.Name, MatchMode.Anywhere), Restrictions.InsensitiveLike("Type", foo.Type, MatchMode.Anywhere))) .SetCacheable(true); } But how do I do this when the method parameter is a list of Foo? public ICriteria CreateCriteria(IList<Foo> foos) { return session .CreateCriteria<Component>() .CreateCriteria("Versions") .CreateCriteria("PublishedEvents") .Add(Restrictions.And(Restrictions.InsensitiveLike("Name", foo.Name, MatchMode.Anywhere), Restrictions.InsensitiveLike("Type", foo.Type, MatchMode.Anywhere))) .SetCacheable(true); }

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  • NSFormatter problem: not getting called for the empty string

    - by Enchilada
    I have created a custom formatter for my (read-only) table column. It looks like this: - (NSString *)stringForObjectValue:(id)anObject { NSAssert([anObject isKindOfClass:[NSString class]] && anObject != nil, @"invalid object"); if ([anObject isEqualToString:@""]) return @"EMPTY"; else return [anObject stringByAppendingString:@"++"]; } Very simple. The corresponding objects are just strings, so it's an string-to-string formatter. All non-empty string objects are returned with @"++" appended to them. Empty string objects should be turned into the @"EMPTY" string. The @"++" gets appended to non-empty strings just fine. The problem is, @"EMPTY" never gets shown! My formatter is never called by Cocoa when the underlying object is the empty string. The corresponding row just keeps being empty, instead of showing my requested @"EMPTY". Any ideas?

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  • Java generics: What is the compiler's issue here? ("no unique maximal instance")

    - by Epaga
    I have the following methods: public <T> T fromJson( Reader jsonData, Class<T> clazz ) { return fromJson( jsonData, (Type)clazz ); } public <T> T fromJson( Reader jsonData, Type clazz ) { ... } The compiler is saying about the first method: type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,java.lang.Object return fromJson( jsonData, (Type)clazz ); ^ What is the problem?

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  • Object drag delay issue

    - by Johnny Darvall
    I have this code that drags stuff around perfectly in IE - however in firefox the onmousedown-drag of the object does not immediately drag but shows the no-entry cursor and then after onmouseup the object drags around freely. The object does stop draging on the next onmouseup. The object should only drag in the onmousdown state, while the onmousup call should cancel the drag by making j_OK=0. I think it may have something to do with the image inside... the object: <em style=position:absolute;left:0;top:0;width:32;height:32;display:block> < img src=abc.gif onmousedown=P_MV(this.parentNode) style=position:absolute;left:0;top:0;width:inherit> </em> function P_MV(t) { p_E=t j_oy=parseInt(p_E.style.top) j_ox=parseInt(p_E.style.left) j_OK=1 document.onselectstart=function(){return false} document.onmousemove=P_MVy } function P_MVy(e) { if(j_OK) { p_E.style.top=(j_FF?e.clientY:event.clientY)-j_y+j_oy p_E.style.left=(j_FF?e.clientX:event.clientX)-j_x+j_ox } return false }

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  • Linq to Entity Left Outer Join

    - by radman
    Hi All, I have an Entity model with Invoices, AffiliateCommissions and AffiliateCommissionPayments. Invoice to AffiliateCommission is a one to many, AffiliateCommission to AffiliateCommissionPayment is also a one to many I am trying to make a query that will return All Invoices that HAVE a commission but not necessarily have a related commissionPayment. I want to show the invoices with commissions whether they have a commission payment or not. Query looks something like: using (var context = new MyEntitities()) { var invoices = from i in context.Invoices from ac in i.AffiliateCommissions join acp in context.AffiliateCommissionPayments on ac.affiliateCommissionID equals acp.AffiliateCommission.affiliateCommissionID where ac.Affiliate.affiliateID == affiliateID select new { companyName = i.User.companyName, userName = i.User.fullName, email = i.User.emailAddress, invoiceEndDate = i.invoicedUntilDate, invoiceNumber = i.invoiceNumber, invoiceAmount = i.netAmount, commissionAmount = ac.amount, datePaid = acp.paymentDate, checkNumber = acp.checkNumber }; return invoices.ToList(); } This query above only returns items with an AffiliateCommissionPayment.

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  • In registration form adding date dialogbox how can apply validation in system date in dialog ends

    - by narasimha
    hi i am implementing registration form adding date field then click icon to display date dialog window then limit date validation in system date below date only how can implement the validation protected Dialog onCreateDialog(int id) { Calendar c = Calendar.getInstance(); int cyear = c.get(Calendar.YEAR); int cmonth = c.get(Calendar.MONTH); int cday = c.get(Calendar.DAY_OF_MONTH); switch (id) { case DATE_DIALOG_ID: return new DatePickerDialog(this, mDateSetListener, cyear, cmonth, cday); } return null; } private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() { public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) { String date_selected = String.valueOf(monthOfYear+1)+" /"+String.valueOf(dayOfMonth)+" /"+String.valueOf(year); EditText birthday=(EditText) findViewById(R.id.EditTextBirthday); birthday.setText(date_selected); } }; public void onClick(View v) { if(v == b1) showDialog(DATE_DIALOG_ID); } } ** showing in system date in below dates only how can implemented some solution in running year to below years are display not incrementing above years this condition are appliying validations how can implemented ?

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  • PHP is not called properly in IE using set interval function in Javascript

    - by Hemant
    Hi all, I am trying to show the message updated in DB using the following code var showtime = setInterval('redirect()',5000); ////Redirecting to DB Status ///// function redirect() { xmlhttp = GetXmlHttpObject(); if (xmlhttp==null) { alert ("Browser does not support HTTP Request"); return; } var url="isResultexist.php" xmlhttp.onreadystatechange=stateChanged; xmlhttp.open("GET",url,true); xmlhttp.send(null); } I am collecting the response from PHP here and using it to update the Messages on UI Problem here is it works fine 1st time when it called after 5sec but there after return the Same result even DB is updated, This works fine with Mozilla and google chrome browser regards hemant

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  • Whats the scope of a c function defined within objective-c class?

    - by roja
    I was reading up about bypassing objective-c's messaging to gain performance (irrelevant to this specific question) when i found an interesting bit of code: #import <Cocoa/Cocoa.h> @interface Fib : NSObject { } - (long long) cFib: (NSUInteger) number; @end @implementation Fib // c implementation of fib long long cFibIMP(NSUInteger number) { return (number < 3) ? 1 : cFib(number - 1) + cFib(number - 2); } // method wrapper for c implementation of fib - (long long) cFib: (NSUInteger) number { return cFibIMP(number); } @end My question is; when using c function, within an objective-c object, what scope is the c function (cFibIMP in this particular case) placed in? Does the objective-c class encapsulate the c function removing change of name-clash or is the c function simply dumped into the global scope of the whole objective-c program?

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  • Cpp some basic problems

    - by DevAno1
    Hello. My task was as follows : Create class Person with char*name and int age. Implement contructor using dynamic allocation of memory for variables, destructor, function init and friend function show. Then transform this class to header and cpp file and implement in other program. Ok so I've almost finished my Person class, but I get error after destructor. First question is how to write this properly ? #include <iostream> using namespace std; class Person { char* name; int age; public: int * take_age(); Person(){ int size=0; cout << "Give length of char*" << endl; cin >> size; name = new char[size]; age = 0; } ~Person(){ cout << "Destroying resources" << endl; delete *[] name; delete * take_age(); } friend void(Person &p); int * Person::take_age(){ return age; } void init(char* n, int a) { name = n; age = a; } void show(Person &p){ cout << "Name: " << p.name << "," << "age: " << p.age << endl; } }; int main(void) { Person *p = new Person; p->init("Mary", 25); p.show(); system("PAUSE"); return 0; } And now with header/implementation part : - do I need to introduce constructor in header/implementation files ? If yes - how? - my show() function is a friendly function. Should I take it into account somehow ? I already failed to return this task on my exam, but still I'd like to know how to implement it.

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