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Send POST request using NSURLSession
...;
[request setHTTPMethod:@"POST"];
NSDictionary *mapData = [[NSDictionary alloc] initWithObjectsAndKeys: @"TEST IOS", @"name",
@"IOS TYPE", @"typemap",
nil];
NSData *postData = [NSJSONSerialization dataWithJSONObject:mapData options:0 error:&error];
[re...
Differences between C++ string == and compare()?
...or==
21.4.8.2 operator==
template<class charT, class traits, class Allocator>
bool operator==(const basic_string<charT,traits,Allocator>& lhs,
const basic_string<charT,traits,Allocator>& rhs) noexcept;
Returns: lhs.compare(rhs) == 0.
Seems like ...
Python List vs. Array - when to use?
...discontiguous and sparse arrays, and I think some pluggable strategies for allocating memory for large arrays... some of these advanced features will make it user less memory, while others will improve performance by using more memory.
– Dan Lenski
Oct 29 '14 a...
'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...
Java heap terminology: young, old and permanent generations?
...lowing.
Eden Space (heap): The pool from which memory is initially allocated
for most objects.
Survivor Space (heap): The pool containing objects that have survived
the garbage collection of the Eden
space.
Tenured Generation (heap): The pool containing objects that have existed
...
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 ...
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...
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, ...
How far can memory leaks go?
I've run into memory leaks many times. Usually when I'm malloc -ing like there's no tomorrow, or dangling FILE * s like dirty laundry. I generally assume (read: hope desperately) that all memory is cleaned up at least when the program terminates. Are there any situations where leaked memory won't ...
Why Large Object Heap and why do we care?
...ments. That's another optimization for 32-bit code, the large object heap allocator has the special property that it allocates memory at addresses that are aligned to 8, unlike the regular generational allocator that only allocates aligned to 4. That alignment is a big deal for double, reading or ...