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What does T&& (double ampersand) mean in C++11?
...just be destroyed; why not make use of the resources the temporary already allocated? In C++03, there's no way to prevent the copy as we cannot determine we were passed a temporary. In C++11, we can overload a move constructor:
foo(foo&& other)
{
this->length = other.length;
this...
The easiest way to transform collection to array?
...bly because it's an intrinsic.
It can avoid zero-filling the freshly allocated array because it knows the
entire array contents will be overwritten. This is true regardless of what
the public API looks like.
The implementation of the API within the JDK reads:
default <T> T[] to...
Iterating each character in a string using Python
...thon 2.x, range() creates a list, so for a very long length you may end up allocating a very large block of memory. At the very least use xrange() in those cases. Also, repeated indexing of the same string is much slower than iterating directly over the string. If you need the index, use enumerate()...
File to byte[] in Java
...
Basically you have to read it in memory. Open the file, allocate the array, and read the contents from the file into the array.
The simplest way is something similar to this:
public byte[] read(File file) throws IOException, FileTooBigException {
if (file.length() > MAX...
Unable to execute dex: GC overhead limit exceeded in Eclipse
... than about 1500M (on Linux) or 1100M (on Windows) because the VM needs to allocate contiguous address space, and that's a very limited resource for 32-bit apps.
– Jules
May 12 '14 at 4:07
...
How to use performSelector:withObject:afterDelay: with primitive types in Cocoa?
...st make sure your pointers are still valid after the delay (ie. no objects allocated on stack).
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How can I initialize base class member variables in derived class constructor?
...onstructor. It will first be default-initialized when the instance of B is allocated, then it will be assigned inside the B's constructor. But I also think the compiler can still optimize this.
– Violet Giraffe
Jan 10 '19 at 11:36
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How to use NSJSONSerialization
..."; // The Openweathermap JSON responder
NSURL *url = [[NSURL alloc]initWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
NSURLResponse *response;
NSData *GETReply = [NSURLConnection sendSynchronousRequest:request returningResponse:&resp...
Static constant string (class member)
...lation unit only
const char A::RECTANGLE[] = "rectangle";
There! No heap allocation, no copying, no dynamic initialization.
Cheers, s.
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Redis: Show database size/size for keys
...ue require to be stored in RAM.
The reported usage is the total of memory allocations for data and administrative overheads that a key its value require
(source redis documentation)
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