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How do I read a text file of about 2 GB? [duplicate]
...ile will require around 800MB of memory, and the OS may balk at the memory allocation request."
– Emad Aghayi
Aug 24 '16 at 11:30
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iPhone system font
... like this :
//get system default font
UILabel *label = [[UILabel alloc] init];
fontname = label.font.fontName;
[label release];
Looks stupid but it works.
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Java equivalent of unsigned long long?
...Integer class will be used. This means that upto 8 new BigIntegers will be allocated, this is quite a lot and definitely a performance drop.
– Toonijn
Sep 24 '16 at 18:57
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Using smart pointers for class members
...w pointers are bad when used for performing manual memory management, i.e. allocating and deallocating objects through new and delete. When used purely as a means to achieve reference semantics and pass around non-owning, observing pointers, there is nothing intrinsically dangerous in raw pointers, ...
How can I change the image displayed in a UIImageView programmatically?
...one you add to your Resources folder in Xcode.
UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://farm4.static.flickr.com/3092/2915896504_a88b69c9de.jpg"]]];
or
UIImage *image = [UIImage imageNamed: @"cell.png"];
Once you have an Image yo...
✔ Checkmark selected row in UITableViewCell
...lIdentifier];
if(cell == nil )
{
cell =[[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
if ([indexPath compare:self.lastIndexPath] == NSOrderedSame)
{
cell.accessoryType = UITableViewCellAccesso...
“:” (colon) in C struct - what does it mean? [duplicate]
...n fit into a single int (i.e. 32 bits in the example above), the compiler allocates only a single int's worth of memory (test_1, short type for test_2, char type for test3). Ignored in the above example, if a single int can't hold the bitfields anymore, we add a second one. ref to this example for...
Convert Set to List without creating new List
...e given set and then
putting these objects into a new array.
So the newly allocated memory should be negligible.
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How to convert a char to a String?
...ch is less efficient because the StringBuilder is backed by a char[] (over-allocated by StringBuilder() to 16), only for that array to be defensively copied by the resulting String.
String.valueOf(char) "gets in the back door" by wrapping the char in a single-element array and passing it to the pac...
How to upper case every first letter of word in a string? [duplicate]
...s can be improved a bit. The length of the string is known, so you can pre-allocate the StringBuilder's length. Since you are going to call StringBuilder.append anyway, don't bother creating a new char[] and String in each loop iteration: just append the capitalized letter, then the rest of the word...