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• Struct with pointer to a function

  - by user354021

  Hello, In a C struct I have defined a function pointer as follows: typedef struct _sequence_t { const int seq[3]; typedef void (* callbackPtr)(); } sequence_t; I want to initialize a var of that type globally with: sequence_t sequences[] = { { { 0, 1, 2 }, toggleArmament }, }; And I keep getting error telling me that there are too many initializers. How to work it out?

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• How much memory does a hashtable use?

  - by Michael

  Would a hashtable/hashmap use a lot of memory if it only consists of object references and int's? As for a school project we had to map a database to objects (that's what being done by orm/hibernate nowadays) but eager to find a good way not to store id's in objects in order to save them again we thought of putting all objects we created in a hashmap/hashtable, so we could easily retrieve it's ID. My question is if it would cost me performance using this, in my opinion more elegant way to solve this problem.

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• Eclipse - How to show warning for unused method parameter ?

  - by Brad

  I am using Eclipse v3.5. In previous Eclipse versions i remember if i have defined a method with a parameter and didn't use it internally a warning appears, like this : public void myMethod( int x ) { // Didn't use x here so a warning appears at the x parameter. } But in v3.5 i do not see this warning. How can i enable it in Eclipse ?

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• Is this a correct syntax (c code found on wikipedia)?

  - by m4design

  I just found this code on wikipedia. Link: http://en.wikipedia.org/wiki/Sizeof#Use The code: /* the following code illustrates the use of sizeof * with variables and expressions (no parentheses needed), * and with type names (parentheses needed) */ char c; printf("%zu,%zu", sizeof c, sizeof(int)); It states that: "The z prefix should be used to print it, because the actual size can differ on each architecture." I tried it on my compiler, but it gives the following result: 'zu,zu'

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• Creating New Object of Other Class dynamicly ?

  - by Meko

  I am trying to create new object of other class in a for loop. like for(int i =0;i<10;i++){ Computer p1=new Computer(10,20); } and when I try anywhere to reach p1.someAction(); it say you must declare p1. But if I declare it on top of program how can I create again in loop? I also try only Computer p1; but it gave exeption ..

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• how to get variable stored in another object using objective c

  - by mac

  Hi All SaveNotes *saveNotes = [[SaveNotes alloc]initWithTitleString:title descrString:descr]; [titleDescrObjects addObject:saveNotes]; [saveNotes release]; from the above code i have saved title,descr to a class SaveNotes , and then i have stored that object in my NSMutableArray - titleDescrObjects, Its working fine, i need to get particular objects "descr" alone, how to get the descr from objectAtIndex:i i am trying for (int i=0; i<[titleDescrObjects count]; i++) { NSLog(@"\n ((%@))\n",[titleDescrObjects objectAtIndex:i].descr); } Thanks in advance,

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• Why the array not works ?

  - by question_about_the_problem

  I want to generate the array $result_array. There is no error at the page, but not works! that not works ! //BOF: Result Array $result_array = ''; $result_array .= '"messages" => "' . $errors .'",'; $result_array .= '"this_addr_type" => "' . (int)$_REQUEST['edit'] .'",'; if (ACCOUNT_GENDER == 'true') { $result_array .= '"gender_male" => "' . $male .'",'; $result_array .= '"gender_female" => "' . $female .'",'; } $result_array .= '"firstname" => "' . $entry['entry_firstname'] .'",'; $result_array .= '"lastname" => "' . $entry['entry_lastname'] .'",'; if (ACCOUNT_COMPANY == 'true') { $result_array .= '"company" => "' . $entry['entry_company'] .'",'; } $result_array .= '"street_address" => "' . $entry['entry_street_address'] .'",'; if (ACCOUNT_SUBURB == 'true') { $result_array .= '"suburb" => "' . $entry['entry_suburb'] .'",'; } $result_array .= '"postcode" => "' . $entry['entry_postcode'] .'",'; $result_array .= '"city" => "' . $entry['entry_city'] .'",'; if (ACCOUNT_STATE == 'true') { $result_array .= '"state" => "' . $entry['entry_state'] .'",'; } $result_array .= '"country" => "' . $entry['entry_country_id'] .'"'; //EOF: Result Array $_RESULT = array($result_array); that works $_RESULT = array( "this_addr_type" => (int)$_REQUEST['edit'], "gender_male" => $male, "gender_female" => $female, "firstname" => $entry["entry_firstname"], "lastname" => $entry["entry_lastname"], "company" => $entry["entry_company"], "street_address" => $entry["entry_street_address"], "suburb" => $entry["entry_suburb"], "postcode" => $entry["entry_postcode"], "city" => $entry["entry_city"], "state" => $entry["entry_state"], "country" => $entry["entry_country_id"] );

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• Default Struct Initialization in C++

  - by coryr

  Say I have a struct that looks like this (a POD): struct Foo { int i; double d; }; What are the differences between the following two lines: Foo* f1 = new Foo; Foo* f2 = new Foo();

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• Random.nextInt(5) throws an IllegalArgumentException!!??

  - by Tom R

  I'm really not sure what else to say about this: Random r = new Random(); class SomeClass { public SomeClass(){ new SomeClass(r.nextInt(5)); } public SomeClass(int i){ ... Throws a NullPointerException where r.nextInt(5) is called. Any ideas?

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• How to get an array size

  - by John Doe

  I'd like to know how to get an array rows & columns size. For instance it would be something like this: int matrix[][] = { { 2, 3 , 4}, { 1, 5, 3 } } The size of this one would be 2 x 3. How can I calculate this without including other libraries but stdio or stdlib?

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• How initialize array of classes? (C++)

  - by Kra

  Hello, I have this class constructor: Pairs (int Pos, char *Pre, char *Post, bool Attach = true); How can I initialize array of Pairs classes? I tried: Pairs Holder[3] = { {Input.find("as"), "Pre", "Post"}, {Input.find("as"), "Pre", "Post"}, {Input.find("as"), "Pre", "Post"} }; Apparently it's not working, I also tried to use () brackets instead of {} but compiler keeps moaning all the time. Sorry if it is lame question, I googled quite hard but wasn't able to find answer :/ Thanks.

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• how do i avoid this linking error ?

  - by Yogesh

  if i have defined a global variable(with initialization) in header file, and included this file in two file and try to compile and link, compiler gives linking error ----------------- >>headers.h #ifndef __HEADERS #define __HEADERS int x = 10; #endif >>1.c #include "headers.h" main () { } --------------------- >>2.c #include "headers.h" fun () {}

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• MySQL: SUM in WHERE clause

  - by checcco

  Hi guys, I've got this table CREATE TABLE `subevents` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(150) DEFAULT NULL, `content` text, `class` tinyint(4) NOT NULL DEFAULT '1', PRIMARY KEY (`id`) ) ENGINE=MyISAM Each row can have a different value in the 'class' field. I'd like to select any number of rows, ordered randomly, as long as the sum of the values in the 'class' field is equal to 100. How could I accomplish it directly in the MySQL query without doing it later in PHP? Thanks everybody!

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• Scope of const char*

  - by Neeraj

  Consider this code: const char* someFun() { // ... some stuff return "Some text!!" } int main() { { // Block: A const char* retStr = someFun(); // use retStr } } My question is in the function sumFun() where is "some Text!!", stored (i think may be in some static area in ROM) and what will be its scope? Will the memory pointed by retStr be occupied throughout the program or be released once the block A exits? -- Thanks

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• Python - copy by reference

  - by qba

  Is there any possibility to copy variable by reference no matter if its int or class instance? My goal is to have two lists of the same objects and when one changes, change is visible in second. In other words i need pointers:/

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• how to cancel an awaiting task c#

  - by user1748906

  I am trying to cancel a task awaiting for network IO using CancellationTokenSource, but I have to wait until TcpClient connects: try { while (true) { token.Token.ThrowIfCancellationRequested(); Thread.Sleep(int.MaxValue); //simulating a TcpListener waiting for request } } any ideas ? Secondly, is it OK to start each client in a separate task ?

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• Will exit() or an exception prevent an end-of-scope destructor from being called?

  - by Truncheon

  Let's say I have the following code: struct mytype { ~mytype() { /* do something like call Mix_CloseAudio etc */ } }; int main() { mytype instant; init_stuff(); start(); return 0; } Is that destructor guaranteed to be called even if exit() is used from somewhere inside start() ?

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• Call c++ function pointer from c#

  - by Sam

  Is it possible to call a c(++) static function pointer like this typedef int (*MyCppFunc)(void* SomeObject); from c#? void CallFromCSharp(MyCppFunc funcptr, IntPtr param) { funcptr(param); } I need to be able to callback from c# into some old c++ classes. C++ is managed, but the classes are not ref classes (yet). So far I got no idea how to call a c++ function pointer from c#, is it possible?

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• error in c, but not in c++

  - by eswar

  const int t=5; char buf[t+5]; When I compile this gives error in C but not in C++!! Can anybody please explain me the reason? Note: I know the const defaults to internal linkage in 'C++', where as in 'C' it defaults to external linkage. Does it has any relation to the above case??

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• sql user defined function

  - by nectar

  for a table valued function in sql why cant we write sql statements inside begin and end tags like- create function dbo.emptable() returns Table as BEGIN --it throws an error return (select id, name, salary from employee) END go while in scalar valued function we can use these tags like create function dbo.countemp() returns int as begin return (select count(*) from employee) end go is there any specific rule where we should use BEGIN & END tags

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• What is time complexity for find method in a set in c++?

  - by tsubasa

  set<int> s; s.insert(1); s.insert(2); ... s.insert(n); I wonder how much time it takes for s.find(k) where k is a number from 1..n? I assume it is log(n). Is it correct?

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• Sorting a C# Dictionary

  - by SoulReaver

  I have a dictionary in C# like Dictionary<Person, int> and I want to sort that dictionary in place with respect to keys (a field in class Person). How can I do it? Every available help on the internet is that of lists with no particular example of in place sorting of Dictionary. Any help would be highly appreciated!

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• C++ sort array of strings

  - by user69514

  I am trying to sort an array of strings, but it's not sorting anything.... what am I doing wrong? string namesS[MAX_NAMES]; int compare (const void * a, const void * b){ return ( *(char*)a - *(char*)b ); } void sortNames(){ qsort(namesS, MAX_NAMES, sizeof(string), compare); }

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• Storing a type in C++

  - by perimosocordiae

  Is it possible to store a type name as a C++ variable? For example, like this: type my_type = int; // or string, or Foo, or any other type void* data = ...; my_type* a = (my_type*) data; I know that 99.9% of the time there's a better way to do what you want without resorting to casting void pointers, but I'm curious if C++ allows this sort of thing.

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• declare field without initial value in php?

  - by Charles

  I don't want to give an initial value. I want to set these later using the set method class Duck { var int id; var set = Array(); } Any idea how to declare without getting error?

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