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Is it possible to use global variables in Rust?
...
It's possible but no heap allocation allowed directly. Heap allocation is performed at runtime. Here are a few examples:
static SOME_INT: i32 = 5;
static SOME_STR: &'static str = "A static string";
static SOME_STRUCT: MyStruct = MyStruct {
nu...
In Java, how do I convert a byte array to a string of hex digits while keeping leading zeros? [dupli
...rray = {
"00","01","02","03","04","05","06","07","08","09","0A","0B","0C","0D","0E","0F",
"10","11","12","13","14","15","16","17","18","19","1A","1B","1C","1D","1E","1F",
"20","21","22","23","24","25","26","27","28","29","2A","2B","2C","2D","2E","2F",
"30","31","32","33","34","35","36","37","38","39...
Is it safe to delete a NULL pointer?
...ter delete. Setting a pointer to NULL after deleting it masquerades memory allocation errors, which is a very bad thing. A program that is correct does not delete a pointer twice, and a program that does delete a pointer twice should crash.
– Damon
Aug 30 '13 a...
How can I make a clickable link in an NSAttributedString?
...tedString.
NSMutableAttributedString * str = [[NSMutableAttributedString alloc] initWithString:@"Google"];
[str addAttribute: NSLinkAttributeName value: @"http://www.google.com" range: NSMakeRange(0, str.length)];
yourTextView.attributedText = str;
Edit:
This is not directly about the question ...
Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
...e enough (512M) memory for the InnoDB buffer pool:
Fatal error: cannot allocate memory for the buffer pool
That begs three questions:
How much memory is on your instance? Should there be enough memory to accommodate the 512M InnoDB is trying to grab for the buffer pool, plus everything else...
How to replace a character by a newline in Vim
...on't need mswin. Just use your own vimrc instead.
– 00dani
Oct 12 '16 at 4:28
...
What is the “Execute Around” idiom?
...e you write a method to do things which are always required, e.g. resource allocation and clean-up, and make the caller pass in "what we want to do with the resource". For example:
public interface InputStreamAction
{
void useStream(InputStream stream) throws IOException;
}
// Somewhere else ...
iOS: How to get a proper Month name from a number?
...nt monthNumber = 11; //November
NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease];
NSString *monthName = [[df monthSymbols] objectAtIndex:(monthNumber-1)];
Note that you'll need to subtract 1 from your 1..12 monthNumber since monthSymbols is zero-based.
...
String concatenation: concat() vs “+” operator
...then throwing it away when you create the final String. In practice memory allocation is surprisingly fast.
Update: As Pawel Adamski notes, performance has changed in more recent HotSpot. javac still produces exactly the same code, but the bytecode compiler cheats. Simple testing entirely fails bec...
Determine the number of lines within a text file
...ne loads the entire contents of the file into an array which means it must allocate at least as much memory as the size of the file. The second merely loops one line at a time so it never has to allocate more than one line's worth of memory at a time. This isn't that important for small files, but f...