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  • Is this a memory leak?

    - by Ben
    char *pointer1; char *pointer2; pointer1 = new char[256]; pointer2 = pointer1; delete [] pointer1; In other words, do I have to do delete [] pointer2 as well? Thanks!

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  • Unknown error in the memory in C

    - by Sergey Gavruk
    I have a 2D dynamic array. I enter a line of 0's after line which has a biggest number: void InsertZero(int **a, int pos){ int i, j; a = (int**)realloc(a, n * sizeof(*a)); a[n-1] = (int*)calloc(n, sizeof(**a)); d = 0; for(i = n-1; i > pos; i--){ for(j = 0; j < n; j++){ a[i][j] = a[i-1][j]; printf("%d ", a[i][j]); } } for(i = 0; i < n; i++){ a[pos][i] = 0; } } If i make a size of array 3, 5, 7, 9, ... it works correctly. But if a number of lines is 2, 4, 6, ... , it is an access violation error, when i try to print my array: void Print(void){ int i, j; for(i = 0; i < (n-d); i++){ for(j = 0; j < n; j++){ printf("%d\t", arr[i][j]); } printf("\n"); } } code: http://codepad.org/JcUis6W4

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  • Memory cleanup on returned array from static method (objective-c)

    - by Michael Bordelon
    In objective-c, I have a utility class with a bunch of static methods that I call for various tasks. As an example, I have one method that returns an NSArray that I allocate in the static method. If I set the NSArray to autorelease, then some time later, the NSArray in my calling method (that is assigned to the returned pointer) losses it's reference because the original form the static method is cleaned up. I can't release the NSArray object in the static method because it needs to be around for the return and assignment. What is the right way to return an object (like the NSArray) from a static class, and have it hang around for the calling class, but then get cleaned up later when it is no longer needed? Do I have to create the object first in the caller and pass in a pointer to the object and then return that same object form the static method? I know this is a basic O-O problem, I just never had this issue in Java and I do not do much C/C++. Thanks for your help.

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  • Spreadsheet::WriteExcel Memory Usage

    - by Stomped
    Hi; I'm trying to create a multi-sheet excel document, and thus far I'd been doing it in PHP - but using PHPExcel was eating up 70MB of RAM for about 60,000 spreadsheet cells total. I'm wondering if anyone has experience with Spreadsheet::WriteExcel and if it has problems with creating very large documents. I'd just give it a shot but I'm very inexperienced with Perl and it could take me quite a bit of time to get this up and rolling even if for a test, and I thought someone here might have insight for me.

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  • C++ stack memory still valid?

    - by jbu
    Hi all, If I create an object on the stack and push it into a list, then the object loses scope (outside of the for loop in the example below) will the object still exist in the list? If the list still holds the object, is that data now invalid/possibly corrupt? Please let me know, and please explain the reasoning.. Thanks, jbu class SomeObject{ public: AnotherObject x; } //And then... void someMethod() { std::list<SomeObject> my_list; for(int i = 0; i < SOME_NUMBER; i++) { SomeObject tmp; my_list.push_back(tmp); //after the for loop iteration, tmp loses scope } my_list.front(); //at this point will my_list be full of valid SomeObjects or will the SomeObjects no longer be valid, even if they still point to dirty data }

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  • NSMutableDictionary memory / address problem, release does not work?

    - by phil
    I am trying to create a NSMutableDictionary(dictA) with objectA. When I try to view my dictionary(NSLog), each key is pointing to the same address. I have an objectA_1 which is type objectA and used to setup the dictionary. Also, if I try to getObject, I always get the last key/value that was added to the dictionary. I tried setValue and got the same results. Is there something wrong with my objectA? Is the release method not working properly? Am I retaining when I shouldn't? Thank you. dictA = [[NSMutableDictionary alloc] init]; objectA *objectA = [[objectA alloc] init]; [dictA setObject:objectA_1 forKey:@"apple"]; [objectA_1 release]; [dictA setObject:objectA_1 forKey:@"japan"]; [objectA_1 release]; [dictA setObject:objectA_1 forKey:@"paris"]; [objectA_1 release]; [dictA setObject:objectA_1 forKey:@"pizza"]; [objectA_1 release]; //NSlog: apple = ""; japan = ""; paris = ""; pizza = "";

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  • UINavigationController and memory management

    - by Dan Ray
    - (void)launchSearch { EventsSearchViewController *searchController = [[EventsSearchViewController alloc] initWithNibName:@"EventsSearchView" bundle:nil]; [self.navigationController pushViewController:searchController animated:YES]; //[searchController release]; } Notice the [searchController release] is commented out. I've understood that pushing searchController onto the navigation controller retains it, and I should release it from my code. I did just alloc/init it, after all, and if I don't free it, it'll leak. With that line commented out, navigation works great. With it NOT commented out, I can navigate INTO this view okay, but coming back UP a level crashes with a *** -[CFArray release]: message sent to deallocated instance 0x443a9e0 error. What's happening here? Is the NavigationController releasing it for me somehow when it goes out of view? The boilerplate that comes on a UINavigationController template in XCode has the newly-pushed controller getting released. But when I do it, it fails.

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  • Objective-c memory management

    - by Chris
    I have a method which runs this: Track* track = [[Track alloc] init:[obj objectForKey:@"PersistentID"] :[obj objectForKey:@"Name"] :[obj objectForKey:@"Artist"] :(NSInteger*)[obj objectForKey:@"Total Time"] :(NSInteger*)[obj objectForKey:@"Play Count"]]; [self setCurrentTrack:(Track*) track]; [track release]; Do I have to release track?

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  • NOOB Memory Problem - EXC_BAD_ACCESS

    - by Michael Bordelon
    I have been banging my head against the wall for a couple days and need some help. I have a feeling that I am doing something really silly here, but I cannot find the issue. This is the controller for a table view. I put the SQL in line to simplify it as part of the troubleshooting of this error. Normally, it would be in an accessor method in a model class. It gets through the SQL read just fine. Finds the two objects, loads them into the todaysWorkout array and then builds the cells for the table view. The table view actually comes up on the scree and then it throws the EXC_BAD_ACCESS. I ran instruments and it shows the following: 0 CFString Malloc 1 00:03.765 0x3946470 176 Foundation -[NSPlaceholderString initWithFormat:locale:arguments:] 1 CFString Autorelease 00:03.765 0x3946470 0 Foundation NSRecordAllocationEvent 2 CFString CFRelease 0 00:03.767 0x3946470 0 Bring It -[WorkoutViewController viewDidLoad] 3 CFString Zombie -1 00:03.917 0x3946470 0 Foundation NSPopAutoreleasePool Here is the source code for the controller. I left it all in there just in case there is something extraneous causing the problem. I sincerely appreciate any help I can get: #import "WorkoutViewController.h" #import "MoveListViewController.h" #import "Profile.h" static sqlite3 *database = nil; @implementation WorkoutViewController @synthesize todaysWorkouts; @synthesize woNoteCell; @synthesize bi; //@synthesize woSwitchCell; - (void)viewDidLoad { [super viewDidLoad]; bi = [[BIUtility alloc] init]; todaysWorkouts = [[NSMutableArray alloc] init]; NSString *query; sqlite3_stmt *statement; //open the database if (sqlite3_open([[BIUtility getDBPath] UTF8String], &database) != SQLITE_OK) { sqlite3_close(database); NSAssert(0, @"Failed to opendatabase"); } query = [NSString stringWithFormat:@"SELECT IWORKOUT.WOINSTANCEID, IWORKOUT.WORKOUTID, CWORKOUTS.WORKOUTNAME FROM CWORKOUTS JOIN IWORKOUT ON IWORKOUT.WORKOUTID = CWORKOUTS.WORKOUTID AND DATE = '%@'", [BIUtility todayDateString]]; if (sqlite3_prepare_v2(database, [query UTF8String], -1, &statement, nil) == SQLITE_OK) { while (sqlite3_step(statement) == SQLITE_ROW) { Workout *wo = [[Workout alloc] init]; wo.woInstanceID = sqlite3_column_int(statement, 0); wo.workoutID = sqlite3_column_int(statement, 1); wo.workoutName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 2)]; [todaysWorkouts addObject:wo]; [wo release]; } sqlite3_finalize(statement); } if(database) sqlite3_close(database); [query release]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { //todaysWorkouts = [BIUtility todaysScheduledWorkouts]; static NSString *noteCellIdentifier = @"NoteCellIdentifier"; UITableViewCell *cell; if (indexPath.section < ([todaysWorkouts count])) { cell = [tableView dequeueReusableCellWithIdentifier:@"OtherCell"]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier: @"OtherCell"] autorelease]; cell.accessoryType = UITableViewCellAccessoryNone; } if (indexPath.row == 0) { Workout *wo = [todaysWorkouts objectAtIndex:indexPath.section]; [cell.textLabel setText:wo.workoutName]; } else { [cell.textLabel setText:@"Completed?"]; [cell.textLabel setFont:[UIFont fontWithName:@"Arial" size:15]]; [cell.textLabel setTextColor:[UIColor blueColor]]; } } else { cell = (NoteCell *)[tableView dequeueReusableCellWithIdentifier:noteCellIdentifier]; if (cell == nil) { NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"NoteCell" owner:self options:nil]; cell = [nib objectAtIndex:0]; } } return cell; //[cell release]; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSUInteger row = [indexPath row]; if (indexPath.section < ([todaysWorkouts count]) && (row == 0)) { MoveListViewController *moveListController = [[MoveListViewController alloc] initWithStyle:UITableViewStylePlain]; moveListController.workoutID = [[todaysWorkouts objectAtIndex:indexPath.section] workoutID]; moveListController.workoutName = [[todaysWorkouts objectAtIndex:indexPath.section] workoutName]; moveListController.woInstanceID = [[todaysWorkouts objectAtIndex:indexPath.section] woInstanceID]; NSLog(@"Workout Selected: %@", [[todaysWorkouts objectAtIndex:indexPath.section] workoutName]); Bring_ItAppDelegate *delegate = [[UIApplication sharedApplication] delegate]; [delegate.workoutNavController pushViewController:moveListController animated:YES]; } else { UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath]; if (indexPath.section < ([todaysWorkouts count]) && (row == 1)) { if (cell.accessoryType == UITableViewCellAccessoryNone) { cell.accessoryType = UITableViewCellAccessoryCheckmark; } else { cell.accessoryType = UITableViewCellAccessoryNone; } } } [tableView deselectRowAtIndexPath:indexPath animated:YES]; } - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { NSInteger h = 35; return h; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return ([todaysWorkouts count] + 1); //return ([todaysWorkouts count]); } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { if (section < ([todaysWorkouts count])) { return 2; } else { return 1; } } - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { if (section < ([todaysWorkouts count])) { return @"Workout"; } else { return @"How Was Your Workout?"; } } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)dealloc { [todaysWorkouts release]; [bi release]; [super dealloc]; } @end

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  • Obj-C memory management: why doesn't this work?

    - by igul222
    Why doesn't the following code work? MyViewController *viewController = [[MyViewController alloc] init]; [myWindow addSubview:viewController.view]; [viewController release]; As I understand, myWindow should be retaining viewController.view for as long as the window needs it. So why does this cause my app to crash on launch? (commenting out the last line fixes the problem, as expected)

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  • ruby memory leak Gdk::PixbufLoader

    - by Reed Debaets
    So I'm beginning to wonder how leaky the gnome2 libraries for ruby1.8.6 are. #!/usr/bin/env ruby require 'gtk2' while true sleep 0.1 pixbuf = Gdk::PixbufLoader.new pixbuf = nil end this leaks about 16kb/sec according to watch -n 1 ps -o rss -p <process id> This is compounded if you start trying to write a chunk of large chunks of image data to it using pixbuf.last_write img_data Any ideas how to get around this (and the second issue)? I need to update image data within my code but it seems like anything that ends up using a pixbuf leaks like a sieve.

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  • Objective-C NSDate memory issue (again)

    - by Toby Wilson
    I'm developing a graphing application and am attempting to change the renderer from OpenGL to Quartz2D to make text rendering easier. A retained NSDate object that was working fine before suddenly seems to be deallocating itself, causing a crash when an NSMutableString attempts to append it's decription (now 'nil'). Build & analyse doesn't report any potential problems. Simplified, the code looks like this: NSDate* aDate -(id)init { aDate = [[NSDate date] retain] return self; } -(void)drawRect(CGRect)rect { NSMutableString* stringy = [[NSMutableString alloc] init]; //aDate is now deallocated and pointing at 0x0? [stringy appendString:[aDate description]]; //Crash } I should stress that the actual code is a lot more complicated than that, with a seperate thread also accessing the date object, however suitable locks are in place and when stepping through the code [aDate release] is not being called anywhere. Using [[NSDate alloc] init] bears the same effect. I should also add that init IS the first function to be called. Can anyone suggest something I may have overlooked, or why the NSDate object is (or appears to be) releasing itself?

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  • Chaining animations and memory management

    - by bryan1967
    Hey Everyone, Got a question. I have a subclassed UIView that is acting as my background where I am scrolling the ground. The code is working really nice and according to the Instrumentation, I am not leaking nor is my created and still living Object allocation growing. I have discovered else where in my application that adding an animation to a UIImageView that is owned by my subclassed UIView seems to bump up my retain count and removing all animations when I am done drops it back down. My question is this, when you add an animation to a layer with a key, I am assuming that if there is already a used animation in that entry position in the backing dictionary that it is released and goes into the autorelease pool? For example: - (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag { NSString *keyValue = [theAnimation valueForKey:@"name"]; if ( [keyValue isEqual:@"step1"] && flag ) { groundImageView2.layer.position = endPos; CABasicAnimation *position = [CABasicAnimation animationWithKeyPath:@"position"]; position.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; position.toValue = [NSValue valueWithCGPoint:midEndPos]; position.duration = (kGroundSpeed/3.8); position.fillMode = kCAFillModeForwards; [position setDelegate:self]; [position setRemovedOnCompletion:NO]; [position setValue:@"step2-1" forKey:@"name"]; [groundImageView2.layer addAnimation:position forKey:@"positionAnimation"]; groundImageView1.layer.position = startPos; position = [CABasicAnimation animationWithKeyPath:@"position"]; position.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; position.toValue = [NSValue valueWithCGPoint:midStartPos]; position.duration = (kGroundSpeed/3.8); position.fillMode = kCAFillModeForwards; [position setDelegate:self]; [position setRemovedOnCompletion:NO]; [position setValue:@"step2-2" forKey:@"name"]; [groundImageView1.layer addAnimation:position forKey:@"positionAnimation"]; } else if ( [keyValue isEqual:@"step2-2"] && flag ) { groundImageView1.layer.position = midStartPos; CABasicAnimation *position = [CABasicAnimation animationWithKeyPath:@"position"]; position.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; position.toValue = [NSValue valueWithCGPoint:endPos]; position.duration = 12; position.fillMode = kCAFillModeForwards; [position setDelegate:self]; [position setRemovedOnCompletion:NO]; [position setValue:@"step1" forKey:@"name"]; [groundImageView1.layer addAnimation:position forKey:@"positionAnimation"]; } } This chains animations infinitely, and as I said one it is running the created and living object allocation doesn't change. I am assuming everytime I add an animation the one that exists in that key position is released. Just wondering I am correct. Also, I am relatively new to Core Animation. I tried to play around with re-using the animations but got a little impatient. Is it possible to reuse animations? Thanks! Bryan

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  • How to free memory from a list of classes

    - by Jason Rowe
    Say I have two classes created work and workItem. CWorker *work = new CWorker(); CWorkItem *workItem = new CWorkItem(); The work class has a public list m_WorkList and I add the work item to it. work->m_WorkList.push_back(workItem); If I just delete work if(work != NULL) delete work; Do I need to loop through the list in the destructor like the following? Any better way to do this? Could I use clear instead? while(m_WorkList.size()) { CWorkItem *workItem = m_WorkList.front(); m_WorkList.pop_front(); if(workItem) delete workItem; }

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  • C++ LPTSTR to int (but memory overwrite problem using atoi)

    - by Dexter
    I have the following code, m_edit is a MFC CEdit (I know I would never use MFC but project demanded it). It's a simple loop, that gets the text from a text edit, converts it to integer after getting the first line, then stores it in m_y vector. LPTSTR szTemp; vector<int> m_y; for(int i = 0; i < m_edit->GetLineCount(); i++){ szTemp = s_y.GetBuffer(0); m_edit->GetLine(i, szTemp); // get line text store in szTemp y = atoi(szTemp); m_y.push_back(y); szTemp = ""; y = 0; } IMPORTANT EXAMPLE: So let's say the CEdit has 6 numbers: 0 5 2 5 18 6 If you use Visual Studio's debugger you will notice an anomaly!! Here's what it shows: y = 0 y = 5 y = 2 y = 5 y = 18 y = 68 Do you see that? szTemp when inserted into atoi, it returns the number 6, but concatenates the 2nd digit of the last number!!! This is why I did szTemp = "";, but the problem persists. Also, let's say the last number was 17 (not 18), then this time debugger would say y = 67, so it is definitely this problem. However, Visual Studio debugger, when you hover over szTemp during this iteration, it says '6' <--- not '68' inside szTemp. So somehow atoi is ruining it. Am I suppose to concatenate a \0 into szTemp before putting it into atoi? How do I solve this easily?

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  • Memory leak in Websphere 7 + EJB3, a lot of instances of ClassMapping

    - by user179168
    Hi, sorry for my english, I speak spanish. I recently migrate an application from ejb 2.x to ejb3 (approx. 300 entities), Im using WebSphere 7.0.0.9. After 10 hours of work, the system crash with an OutOfMemoryError. Analyzing the coredump, I see a lot of instance of the org.apache.openjpa.jdbc.meta.ClassMapping class (please see the attached a screenshot). I believe that the culprit is the list of ValueListeners of the Value class, but I'm not sure, and I dont know how to fix this problem. Thanks

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  • memory available to 64bit Fedora guest under 32bit XP host running virtualbox

    - by Chris Card
    I have successfully installed a 64 bit Fedora 11 guest os using VirtualBox on a host machine (AMD64) running 32 bit Windows XP . At the moment the host machine has 2 Gb ram installed and I've allocated 1 Gb to the guest, which all works well. The host machine can hold a maximum of 4 Gb ram, so I was wondering if it's worth buying an extra 2 Gb for it. I know that 32 bit Windows XP can't use all of the 4 Gb, but can the guest os use any of the ram that the host os can't use?

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  • iPhone, confusing memory leak.

    - by fuzzygoat
    Can anyone tell me what I am doing wrong with the bottom section of code. I was sure it was fine but "Leaks" says it is leaking which quickly changing it o the top version stops, just not sure as to why the bottom variation fails? // Leaks says this is OK if([elementName isEqualToString:@"rotData-requested"]) { int myInt = [[self elementValue] intValue]; NSNumber *valueAsNumber = [NSNumber numberWithInt:myInt]; [self setRotData:valueAsNumber]; return; } . // Leaks says this LEAKS if([elementName isEqualToString:@"rotData-requested"]) { NSNumber *valueAsNumber = [NSNumber numberWithInt:[[self elementValue] intValue]]; [self setRotData:valueAsNumber]; return; } any help would be appreciated. gary

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  • C dynamic memory allocation for table of structs

    - by JosiP
    Hi here is my code. I want to dynamincly change no of elemnts in table with structs __state: typedef struct __state{ long int timestamp; int val; int prev_value; }*state_p, state_t; int main(int argc, char **argv){ int zm; int previous_state = 0; int state = 0; int i = 0; int j; state_p st; //here i want to have 20 structs st. st = (state_p) malloc(sizeof(state_t) * 20); while(1){ previous_state = state; scanf("%d", &state); printf("%d, %d\n", state, previous_state); if (previous_state != state){ printf("state changed %d %d\n", previous_state, state); // here i got compile error: main.c: In function ‘main’: main.c:30: error: incompatible type for argument 1 of ‘save_state’ main.c:34: error: invalid type argument of ‘->’ main.c:34: error: invalid type argument of ‘->’ save_state(st[i],previous_state, state); } i++; } return 0; } I suppose i have to change that st[i] to smth like st+ptr ? where pointer is incermeting in each loop iteration ? Or am I wrong ? When i change code: initialization into state_p st[20] and in each loop iteration i put st[i] = (state_p)malloc(sizeof(state_t)) everything works fine, but i want to dynammicly change number of elemets in that table. Thx in advance for any help

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  • .NET multithreading, volatile and memory model

    - by fedor-serdukov
    Assume that we have the following code: class Program { static volatile bool flag1; static volatile bool flag2; static volatile int val; static void Main(string[] args) { for (int i = 0; i < 10000 * 10000; i++) { if (i % 500000 == 0) { Console.WriteLine("{0:#,0}",i); } flag1 = false; flag2 = false; val = 0; Parallel.Invoke(A1, A2); if (val == 0) throw new Exception(string.Format("{0:#,0}: {1}, {2}", i, flag1, flag2)); } } static void A1() { flag2 = true; if (flag1) val = 1; } static void A2() { flag1 = true; if (flag2) val = 2; } } } It's fault! The main quastion is Why... I suppose that CPU reorder operations with flag1 = true; and if(flag2) statement, but variables flag1 and flag2 marked as volatile fields...

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  • Custom Memory Allocator for STL map

    - by Prasoon Tiwari
    This question is about construction of instances of custom allocator during insertion into a std::map. Here is a custom allocator for std::map<int,int> along with a small program that uses it: #include <stddef.h> #include <stdio.h> #include <map> #include <typeinfo> class MyPool { public: void * GetNext() { return malloc(24); } void Free(void *ptr) { free(ptr); } }; template<typename T> class MyPoolAlloc { public: static MyPool *pMyPool; typedef size_t size_type; typedef ptrdiff_t difference_type; typedef T* pointer; typedef const T* const_pointer; typedef T& reference; typedef const T& const_reference; typedef T value_type; template<typename X> struct rebind { typedef MyPoolAlloc<X> other; }; MyPoolAlloc() throw() { printf("-------Alloc--CONSTRUCTOR--------%08x %32s\n", this, typeid(T).name()); } MyPoolAlloc(const MyPoolAlloc&) throw() { printf(" Copy Constructor ---------------%08x %32s\n", this, typeid(T).name()); } template<typename X> MyPoolAlloc(const MyPoolAlloc<X>&) throw() { printf(" Construct T Alloc from X Alloc--%08x %32s %32s\n", this, typeid(T).name(), typeid(X).name()); } ~MyPoolAlloc() throw() { printf(" Destructor ---------------------%08x %32s\n", this, typeid(T).name()); }; pointer address(reference __x) const { return &__x; } const_pointer address(const_reference __x) const { return &__x; } pointer allocate(size_type __n, const void * hint = 0) { if (__n != 1) perror("MyPoolAlloc::allocate: __n is not 1.\n"); if (NULL == pMyPool) { pMyPool = new MyPool(); printf("======>Creating a new pool object.\n"); } return reinterpret_cast<T*>(pMyPool->GetNext()); } //__p is not permitted to be a null pointer void deallocate(pointer __p, size_type __n) { pMyPool->Free(reinterpret_cast<void *>(__p)); } size_type max_size() const throw() { return size_t(-1) / sizeof(T); } void construct(pointer __p, const T& __val) { printf("+++++++ %08x %s.\n", __p, typeid(T).name()); ::new(__p) T(__val); } void destroy(pointer __p) { printf("-+-+-+- %08x.\n", __p); __p->~T(); } }; template<typename T> inline bool operator==(const MyPoolAlloc<T>&, const MyPoolAlloc<T>&) { return true; } template<typename T> inline bool operator!=(const MyPoolAlloc<T>&, const MyPoolAlloc<T>&) { return false; } template<typename T> MyPool* MyPoolAlloc<T>::pMyPool = NULL; int main(int argc, char *argv[]) { std::map<int, int, std::less<int>, MyPoolAlloc<std::pair<const int,int> > > m; //random insertions in the map m.insert(std::pair<int,int>(1,2)); m[5] = 7; m[8] = 11; printf("======>End of map insertions.\n"); return 0; } Here is the output of this program: -------Alloc--CONSTRUCTOR--------bffcdaa6 St4pairIKiiE Construct T Alloc from X Alloc--bffcda77 St13_Rb_tree_nodeISt4pairIKiiEE St4pairIKiiE Copy Constructor ---------------bffcdad8 St13_Rb_tree_nodeISt4pairIKiiEE Destructor ---------------------bffcda77 St13_Rb_tree_nodeISt4pairIKiiEE Destructor ---------------------bffcdaa6 St4pairIKiiE ======Creating a new pool object. Construct T Alloc from X Alloc--bffcd9df St4pairIKiiE St13_Rb_tree_nodeISt4pairIKiiEE +++++++ 0985d028 St4pairIKiiE. Destructor ---------------------bffcd9df St4pairIKiiE Construct T Alloc from X Alloc--bffcd95f St4pairIKiiE St13_Rb_tree_nodeISt4pairIKiiEE +++++++ 0985d048 St4pairIKiiE. Destructor ---------------------bffcd95f St4pairIKiiE Construct T Alloc from X Alloc--bffcd95f St4pairIKiiE St13_Rb_tree_nodeISt4pairIKiiEE +++++++ 0985d068 St4pairIKiiE. Destructor ---------------------bffcd95f St4pairIKiiE ======End of map insertions. Construct T Alloc from X Alloc--bffcda23 St4pairIKiiE St13_Rb_tree_nodeISt4pairIKiiEE -+-+-+- 0985d068. Destructor ---------------------bffcda23 St4pairIKiiE Construct T Alloc from X Alloc--bffcda43 St4pairIKiiE St13_Rb_tree_nodeISt4pairIKiiEE -+-+-+- 0985d048. Destructor ---------------------bffcda43 St4pairIKiiE Construct T Alloc from X Alloc--bffcda43 St4pairIKiiE St13_Rb_tree_nodeISt4pairIKiiEE -+-+-+- 0985d028. Destructor ---------------------bffcda43 St4pairIKiiE Destructor ---------------------bffcdad8 St13_Rb_tree_nodeISt4pairIKiiEE Last two columns of the output show that an allocator for std::pair<const int, int> is constructed everytime there is a insertion into the map. Why is this necessary? Is there a way to suppress this? Thanks! Edit: This code tested on x86 machine with g++ version 4.1.2. If you wish to run it on a 64-bit machine, you'll have to change at least the line return malloc(24). Changing to return malloc(48) should work.

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  • Memory Profiling with DotTrace Questions

    - by cam
    I ran dotTrace on my application (which is having some issues). IntPtr System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr, IntPtr, Int32, IntPtr, IntPtr) Void System.Windows.Forms.UnsafeNativeMethods.WaitMessage() Are the two main functions that came up, taking about 94% of the application time. Since I didn't know what these two functions were, I ran through my code line by line. It runs smooth and efficiently until a point where it just hangs. "newFrm.Show()". The newFrm only contains a textbox. The larger the file I load into the text box (it's a notepad program), the longer it takes. Now normally this makes sense, but it takes about 30 seconds for a 167 kB file. Now I'm not sure what to do. It runs incredibly slow/stops functioning when you load a textfile and try to resize the window containing the text file too. Then I realized that it is only struggling to open text files with a long string of hex inside (ie) "XX-XX-XX-" etc. With other similarly sized files it struggles with resizing somewhat, but opens within a couple seconds. Does this have something to do with the textbox properties? I've set it to multiline and set maximum characters to 0 (so unlimited). How do I solve this issue? Is there some way I can see what is being called in those functions?

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  • Memory management technique for Objective-C iVars/properties

    - by David Rea
    Is the following code doing anything unnecessary? @interface MyClass { NSArray *myArray; } -(void)replaceArray:(NSArray *)newArray; @implementation MyClass -(void)replaceArray:(NSArray *)newArray { if( myArray ) { [myArray release]; myArray = nil; } myArray = [[NSArray alloc] initWithArray: newArray]; } @end What if I made the following changes: 1) Made myArray a property: @property (nonatomic, retain) NSArray myArray; 2) Changed the assignment to: self.myArray = [NSArray arrayWithArray: newArray]; Would that allow me to remove the conditional?

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