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Is Java really slow?
...bandwidth bound (caching, etc.) this makes it slower. The flipside is that allocation/deallocation is blazing fast (highly optimized). This is a feature of most high-level languages now, and due to objects and use of GC rather than explicit memory allocation. Plus bad library decisions.
Streams-bas...
How to see top processes sorted by actual memory usage?
...nore the VIRT column, that just tells you how much virtual memory has been allocated, not how much memory the process is using. RES reports how much memory is resident, or currently in ram (as opposed to swapped to disk or never actually allocated in the first place, despite being requested).
But, ...
In what cases do I use malloc and/or new?
I see in C++ there are multiple ways to allocate and free data and I understand that when you call malloc you should call free and when you use the new operator you should pair with delete and it is a mistake to mix the two (e.g. Calling free() on something that was created with the new ...
What is a smart pointer and when should I use one?
...nt: When a smart pointer is no longer in use, the memory it points to is deallocated (see also the more detailed definition on Wikipedia).
When should I use one?
In code which involves tracking the ownership of a piece of memory, allocating or de-allocating; the smart pointer often saves you the ne...
Is there a way to iterate over a range of integers?
...
Yes runtime.makeslice is clever enough not to allocate any memory if you ask for zero size allocation. However the above still calls it, and according to your benchmark does take 10nS longer on my machine.
– Nick Craig-Wood
Feb 23 ...
'size_t' vs 'container::size_type'
...
The standard containers define size_type as a typedef to Allocator::size_type (Allocator is a template parameter), which for std::allocator<T>::size_type is typically defined to be size_t (or a compatible type). So for the standard case, they are the same.
However, if you us...
Memory management in Qt?
...someButton = new QPushButton; and QPushButton someButton;. The former will allocate the object on the heap, whereas the latter will allocate it on the stack. There's no difference between QPushButton *someButton = new QPushButton(); and QPushButton someButton = new QPushButton;, both of them will ca...
Passing Data between View Controllers
...h it onto nav stack.
ViewControllerB *viewControllerB = [[ViewControllerB alloc] initWithNib:@"ViewControllerB" bundle:nil];
viewControllerB.isSomethingEnabled = YES;
[self pushViewController:viewControllerB animated:YES];
This will set isSomethingEnabled in ViewControllerB to BOOL value YES.
P...
Is it possible to refresh a single UITableViewCell in a UITableView?
...th:], but that didn't work. But, the following works for me for example. I alloc and release the NSArray for tight memory management.
- (void)reloadRow0Section0 {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
NSArray *indexPaths = [[NSArray alloc] initWithObjects:ind...
Differences between unique_ptr and shared_ptr [duplicate]
...smart pointers, which means that they automatically (in most cases) will deallocate the object that they point at when that object can no longer be referenced. The difference between the two is how many different pointers of each type can refer to a resource.
When using unique_ptr, there can be at...