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Static variable inside of a function in C
...inside a function has a lifespan as long as your program runs. It won't be allocated every time your function is called and deallocated when your function returns.
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What's the best way to develop a sideswipe menu like the one in Facebook's new iOS app?
...uper viewDidLoad];
UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(buttonPressed:)];
UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@select...
Difference between SurfaceView and View?
...dicate surface buffer while all the view shares one surface buffer that is allocated by ViewRoot. In another word, surfaceView cost more resources.
surfaceView cannot be hardware accelerated (as of JB4.2) while 95% operations on normal View are HW accelerated using openGL ES.
More work should be don...
How to get the index of an element in an IEnumerable?
...sing the KeyValuePair value type would allow you to avoid any sort of heap allocations, so long as the .NET impl allocates value types on the stack and any state machine which LINQ may generate uses a field for the Select'd result which isn't declared as a bare Object (thus causing the KVP result to...
What does `someObject.new` do in Java?
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Think of new receiver as a single token. Kind of like a function name with a space in it.
Of course, the class KnockKnockServer does not literally have a function named new receiver, but I'm guessing the syntax is meant to suggest that. It's meant to look li...
STL or Qt containers?
...r types, making std::copy() much less often needed.
STL containers have an Allocator template argument, making custom memory management trivial (typedef required), compared with Qt (fork of QLineEdit required for s/QString/secqstring/). EDIT 20171220: This cuts Qt off of advances in allocator design...
How do I check in JavaScript if a value exists at a certain array index?
...n array
}
Now, under the hood, JavaScript engines almost certainly won't allocate array space linearly and contiguously like this, as it wouldn't make much sense in a dynamic language and it would be inefficient for certain code. They're probably hash tables or some hybrid mixture of strategies, ...
Programmatically create a UIView with color gradient
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Objective-C:
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 50)];
CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = view.bounds;
gradient.colors = @[(id)[UIColor whiteColor].CGColor, (id)[UIColor blackColor].CGColor];
[v...
How do I set up a simple delegate to communicate between two view controllers?
...th {
ChildViewController *detailViewController = [[ChildViewController alloc] init];
// Assign self as the delegate for the child view controller
detailViewController.delegate = self;
[self.navigationController pushViewController:detailViewController animated:YES];
}
// Implement th...
How to split a string literal across multiple lines in C / Objective-C?
...the Quote idea for Objective-C:
#define NSStringMultiline(...) [[NSString alloc] initWithCString:#__VA_ARGS__ encoding:NSUTF8StringEncoding]
NSString *sql = NSStringMultiline(
SELECT name, age
FROM users
WHERE loggedin = true
);
...