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• What Should be the Structure of a C++ Project?

  - by Ell

  I have recently started learning C++ and coming from a Ruby environment I have found it very hard to structure a project in a way that it still compiles correctly, I have been using Code::Blocks which is brilliant but a downside is that when I add a new header file or c++ source file, it will generate some code and even though it is only a mere 3 or 4 lines, I do not know what these lines do. First of all I would like to ask this question: What do these lines do? #ifndef TEXTGAME_H_INCLUDED #define TEXTGAME_H_INCLUDED #endif // TEXTGAME_H_INCLUDED My second question is, do I need to #include both the .h file and the .cpp file, and in which order. My third question is where can I find the GNU GCC Compiler that, I beleive, was packaged with Code::Blocks and how do I use it without Code::Blocks? I would rather develop in a notepad++ sort of way because that is what I'm used to in Ruby but since C++ is compiled, you may think differently (please give advice and views on that as well) Thanks in advance, ell.

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• What are the disadvantages of targeting the JVM instead of x86?

  - by Pindatjuh

  I'm developing a new language. My initial target was to compile to native x86 for the Windows platform, but now I am in doubt. I've seen some new languages target the JVM (most notable Scala and Clojure). Ofcourse it's not possible to port every language easily to the JVM; to do so may lead to small changes to the language and it's design. After posing this question, I even doubted more about this decision. I now know some "pro" JVM arguments. The original question was: is targetting the JVM a good idea, when creating a compiler for a new language? Updated the question: What are the disadvantages of targeting the JVM instead of x86 on Windows?

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• Is call to function object inlined?

  - by dehmann

  In the following code, Foo::add calls a function via a function object: struct Plus { inline int operator()(int x, int y) const { return x + y; } }; template<class Fct> struct Foo { Fct fct; Foo(Fct f) : fct(f) {} inline int add(int x, int y) { return fct(x,y); // same efficiency adding directly? } }; Is this the same efficiency as calling x+y directly in Foo::add? In other words, does the compiler typically directly replace fct(x,y) with the actual call, inlining the code, when compiling with optimizations enabled?

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• Why doesn't a 32bit .deb package install on 64bit Ubuntu?

  - by codebox_rob

  My .deb package, built on 32-bit Ubuntu and containing executables compiled with gcc, won't install on the 64-bit version of the OS (the error message says 'Wrong architecture i386'). This is confusing to me because I thought that in general 32-bit software worked on 64-bit hardware, but not vice-versa. Will it be possible for me to produce a .deb file that I can install on a 64-bit OS, using my 32-bit machine? Is it just a matter of using the appropriate compiler flags to produce the executables (and if so what are they), or is the .deb file itself somehow specific to one processor architecture?

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• Delphi 2010 - Why can't I declare an abstract method with a generic type parameter?

  - by James

  I am trying to do the following in Delphi 2010: TDataConverter = class abstract public function Convert<T>(const AData: T): string; virtual; abstract; end; However, I keep getting the following compiler error: E2533 Virtual, dynamic and message methods cannot have type parameters I don't quite understand the reason why I can't do this. I can do this in C# e.g. public abstract class DataConverter { public abstract string Convert<T>(T data); } Anyone know the reasoning behind this?

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• Beginner C++ Question

  - by Donal Rafferty

  I have followed the code example here toupper c++ example And implemented it in my own code as follows void CharString::MakeUpper() { char* str[strlen(m_pString)]; int i=0; str[strlen(m_pString)]=m_pString; char* c; while (str[i]) { c=str[i]; putchar (toupper(c)); i++; } } But this gives me the following compiler error CharString.cpp: In member function 'void CharString::MakeUpper()': CharString.cpp:276: error: invalid conversion from 'char*' to 'int' CharString.cpp:276: error: initializing argument 1of 'int toupper(int)' CharString.cpp: In member function 'void CharString::MakeLower()': This is line 276 putchar (toupper(c)); I understand that toupper is looking for int as a parameter and returns an int also, is that the problem? If so how does the example work?

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• g++ no matching function call error

  - by gufftan

  I've got a compiler error but I can't figure out why. the .hpp: #ifndef _CGERADE_HPP #define _CGERADE_HPP #include "CVektor.hpp" #include <string> class CGerade { protected: CVektor o, rv; public: CGerade(CVektor n_o, CVektor n_rv); CVektor getPoint(float t); string toString(); }; the .cpp: #include "CGerade.hpp" CGerade::CGerade(CVektor n_o, CVektor n_rv) { o = n_o; rv = n_rv.getUnitVector(); } the error message: CGerade.cpp:10: error: no matching function for call to ‘CVektor::CVektor()’ CVektor.hpp:28: note: candidates are: CVektor::CVektor(float, float, float) CVektor.hpp:26: note: CVektor::CVektor(bool, float, float, float) CVektor.hpp:16: note: CVektor::CVektor(const CVektor&) CGerade.cpp:10: error: no matching function for call to ‘CVektor::CVektor()’ CVektor.hpp:28: note: candidates are: CVektor::CVektor(float, float, float) CVektor.hpp:26: note: CVektor::CVektor(bool, float, float, float) CVektor.hpp:16: note: CVektor::CVektor(const CVektor&)

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• What types of conditions can be used for conditional compilation in C++?

  - by user1002288

  This is an exam question for C++: Which of the following statements accurately describe the condition that can be used for conditional compilation in C++? A. The condition can depend on the value of environment variables. B. The condition can depend on the value of any const variables. C. The condition can depend on the value of program variables. D. The condition can use the sizeof() operator to make decision about compiler-dependent operations based on the size of standard data type. E. The condition must evaluate to either a 0 or 1 during preprocessing. I think the answer is E. Is this correct?

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• variable scope in statement blocks

  - by fearofawhackplanet

  for (int i = 0; i < 10; i++) { Foo(); } int i = 10; // error, 'i' already exists ---------------------------------------- for (int i = 0; i < 10; i++) { Foo(); } i = 10; // error, 'i' doesn't exist By my understanding of scope, the first example should be fine. The fact neither of them are allowed seems even more odd. Surely 'i' is either in scope or not. Is there something non-obvious about scope I don't understand which means the compiler genuinely can't resolve this? Or is just a case of nanny-state compilerism?

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• Are unspecified and undefined behavior required to be consistent between compiles?

  - by sharptooth

  Let's pretend my program contains a specific construct the C++ Standard states to be unspecified behavior. This basically means the implementation has to do something reasonable but is allowed not to document it. But is the implementation required to produce the same behavior every time it compiles a specific construct with unspecified behavior or is it allowed to produce different behavior in different compiles? What about undefined behavior? Let's pretend my program contains a construct that is UB according to the Standard. The implementation is allowed to exhibit any behavior. But can this behavior differ between compiles of the same program on the same compiler with same settings in the same environment? In other words, if I dereference a null pointer on line 78 in file X.cpp and the implementation formats the drive in such case does it mean that it will do the same after the program is recompiled?

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• How does an optimizing compiler react to a program with nested loops?

  - by D.Singh

  Say you have a bunch of nested loops. public void testMethod() { for(int i = 0; i<1203; i++){ //some computation for(int k=2; k<123; k++){ //some computation for(int j=2; j<12312; j++){ //some computation for(int l=2; l<123123; l++){ //some computation for(int p=2; p<12312; p++){ //some computation } } } } } } When the above code reaches the stage where the compiler will try to optimize it (I believe it's when the intermediate language needs to converted to machine code?), what will the compiler try to do? Is there any significant optimization that will take place? I understand that the optimizer will break up the loops by means of loop fission. But this is only per loop isn't it? What I mean with my question is will it take any action exclusively based on seeing the nested loops? Or will it just optimize the loops one by one? If the Java VM complicates the explanation then please just assume that it's C or C++ code.

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• Is there a precedent for the license on a compiler restricting the kind of development you can use it for?

  - by Jim McKeeth

  It was recently let slip that the new EULA for Delphi XE3 will prohibit Client Server development with the Professional edition without the additional purchase of a Client Server license pack. This is not to say the Professional version will lack the features, but the license will specifically prohibit the developer from using the compiler for a specific class of development, even with 3rd party or home grown solutions. So my question is if there is a precedent of a compiler or similar creative tool prohibiting the class of work you can use it for. Specifically a commercially licensed "professional" tool like Delphi XE3. Also, would such a restriction be legally enforceable? I know there have been educational edition or starter edition tools in the past that have restricted their use for commercial purposes, but those were not sold as "professional" tools. Also I know that a lot of computing software and equipment will have a disclaimer that it is not for use in "life support equipment" or "nuclear power" but that is more of avoiding liability than prohibiting activity. Seems like I recall Microsoft putting a restriction in FrontPage that you couldn't use it to create a web site that reflected poorly on Microsoft, but they pulled that restriction before it could be tested legally.

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• TreeGrid in GXT

  - by aTory

  Problem I'm trying to create an asynchronously updating TreeGrid in GXT but encountering issues. The first issue is that I believe the documentation is 'piss poor', at best.. therefore any chance of learning without using 'word of mouth' seems ridiculous. Instead of moaning any further, I shall inform you what I'd LIKE to do and then hopefully you can tell me if what i want is possible. Example knowledge of Football is recommended here I have a few Async services where: getLeagues() getTeams(League) getPlayers(League,Team) getPosition(League,Team,Player) I'd like to have a grid where once it renders, it makes a call to 'getLeagues', where by the server will respond with a bunch of leagues that are currently active on the server... these will be the 'root node' of the TreeGrid. Then, from here you can expand each league to show the teams, right down to the players and then their positions. I'd like to Create a TreeGrid which has a 'listener' on each node, waiting to asynchronously call the server on request and propogate the tree from here, however I'm not sure if this is possible. Can anybody advise? I'm finding all these Models, BaseTreeModels, TreeStores nauseating.

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• SmartGWT - Update ListGridRecord dynamically

  - by Haylwood

  I am using SmartGWT and I have a ListGrid populated with an array of ListGridRecords using the setData() call. I am trying to update a progress property of a single record (on a timer for testing) and have it update in the browser. I have tried various combinations of draw(), redraw(), markForRedraw() etc. to no avail. I also tried overriding the updateRecordComponent() method in my table class, but it only gets called when the records are first created (after createRecordComponent()). I should note that I do NOT want to accomplish this by binding to a DataSource. I just want to be able to update the attribute on the client-side. ArrayList<SegmentSortRecord> mRecords; mRecords.add(new SegmentSortRecord("03312010_M001_S004")); mRecords.add(new SegmentSortRecord("03312010_M001_S005")); mRecords.add(new SegmentSortRecord("03312010_M001_S006")); mRecords.add(new SegmentSortRecord("03312010_M001_S007")); SegmentSortRecord[] records = new SegmentSortRecord[mRecords.size()]; mRecords.toArray(records); mSortProgressTable.setData(records); . . . mTestTimer = new Timer() { public void run() { mTestPercent += 5; if (mTestPercent <= 100) { mSortProgressTable.getRecord(2).setAttribute(Constants.PROGRESS_COL_NAME, mTestPercent); //mSortProgressTable.markForRedraw(); //mSortProgressTable.redraw(); } else { mTestPercent = 0; } } }; ... @Override protected Canvas createRecordComponent(final ListGridRecord aRecord, Integer aColumn) { String fieldName = getFieldName(aColumn); // Want to override the behavior for rendering the "progress" field if (fieldName.equals(Constants.PROGRESS_COL_NAME)) { Progressbar bar = new Progressbar(); bar.setBreadth(10); bar.setLength(100); // The JavaScript record object contains attributes that we can // access via 'getAttribute' functions. bar.setPercentDone(aRecord.getAttributeAsInt(Constants.PROGRESS_COL_NAME)); return bar; } Thanks in advance for any help.

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• Layout in SmartGWT

  - by sarav

  How to place a control at the center of a canvas? I have a main VLayout set to 100%width and 100% haight. I want to place a grid at the center of this layout, meaning at the center of the browser' viewport. How to do that with smartGWT layouts? setLayoutAlign(Alignment.CENTER) This places the controls center to the layout's breadth axis. But if I nest HLayout and VLayout it is not giving desired result.

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• [GWT2] UiBinder work with ToggleButton

  - by EnToutCas

  I'm liking the new GWT2 UiBinder, however, it's not clear whether certain things are achievable using the declarative UI style. For instance, ToggleButton only takes the image instances at construction time (no setters for up/down images). As I understand, UiBinder works in a JavaBean-like reflective way, where the assignable attributes are mapped to corresponding setters. Is this style possible with widgets like ToggleButton, where certain attributes have to be specified at construction time? <g:ToggleButton ui:field="myBtn"></g:ToggleButton>

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• GXT LayoutContainer with scrollbar reports a client height value which includes the area below the s

  - by Pieter Breed

  I have this code which sets up a "main" container into which other modules of the application will go. LayoutContainer c = new LayoutContainer(); c.setScrollMode(Scroll.ALWAYS); parentContainer.add(c, <...>); Then later on, I have the following as an event handler pContainer = c; // pContainer is actually a parameter, but it has c's value pContainer.removeAll(); pContainer.setLayout(new FitLayout()); LayoutContainer wrapperContainer = new LayoutContainer(); wrapperContainer.setLayout(new BorderLayout()); wrapperContainer.setBorders(false); pContainer.add(wrapperContainer); LayoutContainer west = pWestContentContainer; BorderLayoutData westLayoutData = new BorderLayoutData(LayoutRegion.WEST); westLayoutData.setSize(pWidth); westLayoutData.setSplit(true); wrapperContainer.add(west, westLayoutData); LayoutContainer center = new LayoutContainer(); wrapperContainer.add(center, new BorderLayoutData(LayoutRegion.CENTER)); pCallback.withSplitContainer(center); pContainer.layout(); So in effect, the container called 'west' here will be where the module's UI gets displayed. That module UI then does a simple rowlayout with two children. The botton child has RowData(1, 1) so it fills up all the available space. My problem is that the c (parent) container reports a height and width value which includes the value underneath the scrollbars. What I would like is that the scrollbars show all the space excluding their own space. This is a screenshot showing what I mean:

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• Saving State of Objects in GXT

  - by 8EM

  Is there a way to store the state of objects in GXT? That is, having a dynamically configurable GUI built in GXT, you can add your own widgets 'on-the-fly' in any order you like - with your own custom everything. Is there a way to save the state of all the objects, so one can load the profile back at a later date?

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• SmartGWT alternatives

  - by Roger

  I have been using SmartGWT but have run into trouble mixing SmartGWT with other frameworks such as Wicket. Infact it has been a bit of a disaster and I regret going with it in the first place. I do not want this question to turn into any type of flame war, so therefore would just like people to list alternatives and their experience with those alternatives.

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• How to customize look and feel of gird element in GXT 2.0

  - by islee

  Hi, I'm having trouble customizing the way GXT's grid elements appear. there are a few things I'd like to do and I simply don't know how. No column head fields. separate font size, color, type, etc. by column or by rows Can anyone posy me easy how to please?

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• Pass sql Blob to the client side

  - by Tushar Ahirrao

  Hi I want to display image to the client side , but the problem is my image is stored in database in Blob format . Can u help me?

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• Should I use Google Web Toolkit for my new webapp?

  - by balint.miklos

  I would like to create a database backed interactive AJAX webapp which has a custom (specific kind of events, editing) calendaring system. This would involve quite a lot of JavaScript and AJAX, and I thought about Google Web Toolkit for the interface and Ruby on Rails for server side. Is Google Web Toolkit reliable and good? What hidden risks might be if I choose Google Web Toolkit? Can one easily combine it with Ruby on Rails on server side? Or should I try to use directly a JavaScript library like jQuery? I have no experience in web development except some HTML, but I am an experienced programmer (c++, java, c#), and I would like to use only free tools for this project.

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• CellTable + AsyncListViewAdapter<T> + SimplePager<T>, stuck with 'loading' bar when paging

  - by Jaroslav Záruba

  Hi I'm trying to make CellTable, AsyncListViewAdapter<T> and SimplePager<T> working together. I managed to display my data, but whenever I click either "go to start" or "go to end" button I get that 'loading' indicator which stays there till the end of days. (And AsyncListViewAdapter<T>.onRangeChanged doesn't even get called this time.) I went through the code-snippets in this thread, but I can't see nothing suspicions in what I've been doing. Is there some obvious answer to a rookie mistake? I shrinked my variable names, hopefully it won't wrap too much. protected class MyAsyncAdapter extends AsyncListViewAdapter<DTO> { @Override protected void onRangeChanged(ListView<DTO> v) { // doesn't get called on go2start/go2end :( Range r = v.getRange(); fetchData(r.getStart(), r.getLength()); } } private void addTable() { // table: CellTable<DTO> table = new CellTable<DTO>(10); table.addColumn(new Column<DTO, String>(new TextCell()) { @Override public String getValue(DTO namespace) { return namespace.getName(); } }, "Name"); // pager: SimplePager<DTO> pager = new SimplePager<DTO>(table); table.setPager(pager); adapter = new MyAsyncAdapter(); adapter.addView(table); // does not make any difference: // adapter.updateDataSize(0, false); // adapter.updateDataSize(10, true); VerticalPanel vPanel = new VerticalPanel(); vPanel.add(table); vPanel.add(pager); RootLayoutPanel.get().add(vPanel); } // success-handler of my fetching AsyncCallback @Override public void onSuccess(List<DTO> data) { // AsyncCallback<List<DTO>> has start field adapter.updateViewData(start, data.size(), data); if(data.size() < length) adapter.updateDataSize(start + data.size(), true); } Regards J. Záruba

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• Add a DoubleClickHandler to a FixedWidthGrid

  - by MArio

  Hello so I got a FixedWidthGrid table which is made from a pagingtable FixedWidthGrid dataTable = x.getDataTable(); I could add alot of handlers to the dataTables rows like selected or sort policies. but I cant add a double click handler ... anyway idea's ?! thank you I do have a class which I made to try to add a double click hander but it didn't work. class: public class DoubleClickTable extends FixedWidthGrid implements HasDoubleClickHandlers { public DoubleClickTable() { super(); } public HandlerRegistration addDoubleClickHandler(DoubleClickHandler handler) { return addDomHandler(handler, DoubleClickEvent.getType()); } } Thank you so much for your help.

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• List of programming related conferences, unConference and meet-ups in the UK?

  - by Daniel Vaughan

  I really enjoy attending unconference/BarCamp type events and getting to meet developers, designers etc. from different backgrounds and sharing ideas in person. However, I have trouble finding events as there does not seem to be one place where they are listed. Does anyone know of such a place? I also want to setup a Google Technology User Group in Bristol but again other that putting it on Linkedin, Facebook, Meetup.com etc. I don't really know how to get the information out to what would essentially be a niche group of developers. Any ideas?

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