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• What do people find difficult about C pointers?

  - by Paul

  From the number of questions posted here, it's clear that people have some pretty fundemental issues when getting their heads around pointers and pointer arithmetic. I'm curious to know why. They've never really caused me major problems (although I first learned about them back in the Neolithic). In order to write better answers to these questions, I'd like to know what people find difficult. So, if you're struggling with pointers, or you recently were but suddenly "got it", what were the aspects of pointers that caused you problems?

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• C++ variable alias - what's that exactly, and why is it better to turn if off?

  - by Poni

  I've read the essay Surviving the Release Version. Under the "Aliasing bugs" clause it says: You can get tighter code if you tell the compiler that it can assume no aliasing.... I've also read Aliasing (computing). What exactly is a variable alias? I understand it means using a pointer to a variable is an alias, but, how/why does it affect badly, or in other words - why telling the compiler that it can assume no aliasing would get me a "tighter code"

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• Click a link to display a value

  - by Luke

  Hey guys, I have a chat box with a user list. I want to create a button for each member so if clicked, their username is added to the chatroom text box. Whats the best way to do this? Thanks

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• Serialize boost array

  - by jules

  I would like to serialize a boost::array, containing something that is already serializable. If get this error: error C2039: 'serialize' : is not a member of 'boost::array<T,N>' I have tried to include the serialization/array.hpp header but it did not help. Is there another header to include ? According to the documentation I should be able to do that http://www.chuchusoft.com/serialization/doc/boost_types.html Thanks

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• Scan Numbers among letters in a Sentence

  - by ZaZu

  Hello, I have a pretty easy question. (using C) In a sentence such as In this document, there are 345 words and 6 figures How can I scan 345 and 6 while ignoring all that is in between ? I tried fscanf(FILE *pointer,"%d %d",&words,&figs); But it only gets the first value ... What am I doing wrong ?

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• Is there a posibility to break on every object reference in eclipse debugger ?

  - by lbownik

  Suppose I have a class public classs MyClass { private Set<String> set = new HashSet<String>(); //and many methods here } is there a possibility to make an eclipse debugger stop at every line where set member is used ?

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• MySQL 5 left join unknown column

  - by NP

  I had the below query working in mysql 4.1, but does not in 5.0: SELECT * FROM email e, event_email ee LEFT JOIN member m on m.email=e.email WHERE ee.email_id = e.email_id The error: 1054 (Unknown column 'e.email' in 'on clause')

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• Sample code for POST + cookie?

  - by OverTheRainbow

  Hello, I've been googling for some VB.Net code to authenticate to a web server with the POST method, receive a session ID in a cookie, and then send this cookie along with all GET queries... but all I found is half-working code or C# code, ie. difficult to use for a VB.Net newbie. Would someone have some code handy or some pointer that I could use to get started? Thank you.

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• unix DECLARE_WAIT_QUEUE_HEAD (var) var prototype?

  - by yoavstr

  hello i want to work with 2 queue in the module where i change my pointer to them therefore i need to use : //declartion wait_queue_head_t **currentQ; DECLARE_WAIT_QUEUE_HEAD (readWaitQ1); DECLARE_WAIT_QUEUE_HEAD (readWaitQ2); if(condition){ currentQ = &readWaitQ1; }else{ currentQ = &readWaitQ2; } but i get incorrect type for wake_up an other stuff using the queue. even thought i google it i couldnt find an answer can someone just give me the prototype needed?...

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• C++ interview question

  - by benjamin button

  as i am not an expert in c++,i was not aware of the answer to this question asked in one of the interviews. lets say there is a base class pointer which is pointing to a base class object: baseclass *bptr; bptr= new baseclass; now if i do bptr= new derived; what is the problem here?

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• add a custom view/windows in the mac os X dock

  - by AP

  Hello, I would like to add a custom view (a pager) in the dock, just before the trash and was wondering on how to perform a such task. Do you have any pointer to help me to start? Thanks in advance for your help :) regards,

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• C++, is it possible to dimension array

  - by aaa

  hi. Suppose I have some pointer, which I want to reinterpret as static dimension array reference: double *p; double (&r)[4] = ?(p); // some construct? Is it possible to do so? how do I do it?

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• How to get number of attributes in a java class?

  - by llm

  I have a java class containing all the columns of a database table as attributes (member variables) and corresponding getters and setters. I want to have a method in this class called getColumnCount() that returns the number of columns (i.e. the number of attributes in the class)? How would I implement this without hardcoding the number? I am open to critisims on this in general and suggestions. Thanks.

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• managing IB objects without iboutlets

  - by palominoz

  i have got 24 buttons in my project.I need to manage them but I don't want to get my MainViewController polluted by 24 declarations of pointers, properties & synthesizes. i was thinking about using buttonPushed functions and do it like: -(IBAction)buttonPushed:(id)sender{ UIbutton *button=sender; [buttons addObjectAtIndex:[sender tag]]; } my question is:is sender a pointer to the IBObject?

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• Creating an instance of a subclass extending an abstract class (Java)

  - by dacay

  In Java, is there any way to create an instance of any class that extends abstract class A, inside a member method of class A? Classes that extends abstract class A will return their instances with this method, but i don't want to implement same method in all subclasses with a "return this();" kind line.

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• how can I get around no arrays as class constants in php?

  - by user151841

  I have a class with a static method. There is an array to check that a string argument passed is a member of a set. But, with the static method, I can't reference the class property in an uninstantiated class, nor can I have an array as a class constant. I suppose I could hard code the array in the static method, but then if I need to change it, I'd have to remember to change it in two places. I'd like to avoid this.

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• do you call them functions, procedures or methods?

  - by lowlyintern

  consider a standard c# 'function' public void foo() { //some code } In c or c++ this is called a 'function' - even if taking no parameters and returning no value. In another language maybe it would be a 'procedure'. In object orientation speak it would be called a 'method' if a class member. What would be the correct term to use in c#?

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• doxygen with IDL/ODL

  - by John

  If you have a C++ project that has a bunch of .ODL files and the generated .h files from the ODL compiler, should doxygen be told to parse both .odl and .h, or only one or the other? In general I don't like documenting generated code but IDL is sort of a special case. In any case, it seems like the member listing of ODL files is not quite working properly in my tests, are ODL files properly parsed?

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• what is the difference between DWORD and HANDLE type in C?

  - by moon

  i have a thread with return type DWORD in c but it is then handled by a HANDLE type pointer, what is difference between these two types?

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• problems with 'free' in C

  - by lego69

  hello, can somebody please explain can I free const char* ? I allocated new memory using malloc and when I'm trying to free it I always receive an error incompatible pointer type thanks in advance something like this char* name="Arnold"; const char* str=malloc(stlen(name)+1); free(str); <- here bug

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• overloading -> operator in c++

  - by hero

  i saw this code but i couldn't understand what it does: inline S* O::operator->() const { return ses; //ses is a private member of Type S* } so what happens now if i used - ?

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• How to access youtube data api json response $t variable in php?

  - by john

  I'm getting a JSON response from the YouTube Data API. Here is a sample response of the Title variable: stdClass Object ( [$t] = Video Title ) How do I access the $t variable? $blah-$t won't work because it looks for a variable by $t, and not a member of $blah with name $t.

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• [C++ / NCURSES] Can't convert from 'int' to 'int *'

  - by flarn2006

  So I have these lines of code: int maxY, maxX; getmaxyx(stdscr, &maxY, &maxX); It gives me the following error: error C2440: '=' : cannot convert from 'int' to 'int *' Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast twice for each time I use it. I'm not even using the = operator! The curses.h file is included. What am I doing wrong?

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• C++ Pass a hidden arg to a class constructor?

  - by JP

  I would like to define a class that accept the pointer to it's parent class as an Argument, but would it be possible to somehow pass it without needing to pass it directly such as: class Child { public: Child(Parent* hiddenArg); }; class Parent { public: Child myChild; }; I know this is weird, but I am making my own Signal/Slot implementation and Child would be a signal defined, but I would like to get the parent so I can use it's Event Dispatcher...

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• Flex AS3: Is smaller varialble name is faster then longer names?

  - by Lalit

  We are in process of optimization of Flex AS3 Application. One of my team member suggested us to make varible name length smaller to optimize the application performence. i.e. var IsRegionSelected:Boolean = false; //Slower var IsRS:Boolean = false; //faster Is it True? Please provide your views...

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