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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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Best way to serialize an NSData into a hexadeximal string
... const unsigned char *dataBuffer = self.bytes;
char *chars = malloc(sizeof(char) * (bytesCount * 2 + 1));
if (chars == NULL) {
// malloc returns null if attempting to allocate more memory than the system can provide. Thanks Cœur
[NSException raise...
What is a deadlock?
...o process P1 and p2 and there are two resources R1 and R2.
Resource R1 is allocated to process P1 and resource R2 is allocated to process p2.
To complete execution of process P1 needs resource R2, so P1 request for R2, but R2 is already allocated to P2.
In the same way Process P2 to complete its ...
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...
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...
Is it safe to push_back an element from the same vector?
If the second push_back causes a reallocation, the reference to the first integer in the vector will no longer be valid. So this isn't safe?
...
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 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
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Underlining text in UIButton
...) underlinedButton {
UIUnderlinedButton* button = [[UIUnderlinedButton alloc] init];
return [button autorelease];
}
- (void) drawRect:(CGRect)rect {
CGRect textRect = self.titleLabel.frame;
// need to put the line at top of descenders (negative value)
CGFloat descender = self.t...