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How are multi-dimensional arrays formatted in memory?
In C, I know I can dynamically allocate a two-dimensional array on the heap using the following code:
6 Answers
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How can I programmatically get the MAC address of an iphone
...
errorFlag = @"sysctl mgmtInfoBase failure";
else
{
// Alloc memory based on above call
if ((msgBuffer = malloc(length)) == NULL)
errorFlag = @"buffer allocation failure";
else
{
// Get system information, store in buffer
if (sysctl(mgmtI...
How to set initial size of std::vector?
...20000 pointers, so you can insert (up to) that many without it having to reallocate.
At least in my experience, it's fairly unusual for either of these to make a huge difference in performance--but either can affect correctness under some circumstances. In particular, as long as no reallocation tak...
Cocoa Core Data efficient way to count entities
...ng NSManagedObjectContext *moc
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:moc]];
[request setIncludesSubentities:NO]; //Omit subentities. Default is YES (i.e. include subentities)
NSError *err;
N...
Finding JavaScript memory leaks with Chrome
...napshot.
Repeat the same stuff.
Take another heap snapshot.
Filter objects allocated between Snapshots 1 and 2 in Snapshot 3's "Summary" view.
For your example, I have adapted the code to show this process (you can find it here) delaying the creation of the Backbone View until the click event of t...
How to handle Objective-C protocols that contain properties?
... char * argv[])
{
@autoreleasepool {
Person *duncan=[[Person alloc]initConforming];
duncan.firstname=@"Duncan";
duncan.lastname=@"Smith";
[Viewer printLargeDescription:duncan];
Serial *x890tyu=[[Serial alloc]initConforming];
x890tyu.amount=1564...
How to initialize a List to a given size (as opposed to capacity)?
...f string[10] as is (backing store of an lists is also an array) or it will allocate a new memory of its own and then copy the contents of string[10]? string[10] will get garbage collected automatically if L selects the later route.
– RBT
Mar 25 '17 at 4:30
...
UIGestureRecognizer on UIImageView
...nEnabled = YES;
UIPinchGestureRecognizer *pgr = [[UIPinchGestureRecognizer alloc]
initWithTarget:self action:@selector(handlePinch:)];
pgr.delegate = self;
[imageView addGestureRecognizer:pgr];
[pgr release];
:
:
- (void)handlePinch:(UIPinchGestureRecognizer *)pinchGestureRecognizer
{
//handl...
How to determine the memory footprint (size) of a variable?
...ion-oriented, PHP profiler. Some of features are:
measurement of time and allocated memory for each function
CPU usage
file and line number of the function call
output as Google's Trace Event format
caption of functions
grouping of functions
aliases of functions (useful for anonymous function...
Would it be beneficial to begin using instancetype instead of id?
...stancetype that, as far as I can see, replaces id as a return type in -alloc and init .
4 Answers
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