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Why is the .bss segment required?
...un time, b occupies 20 * sizeof(int) bytes.
In the second program, var is allocated space and the assignment in main() modifies that space. It so happens that the space for var was described in the .bss segment rather than the .data segment, but that doesn't affect the way the program behaves when...
Set the location in iPhone Simulator
...LocationFix)
- (void)locationFix {
CLLocation *location = [[CLLocation alloc] initWithLatitude:55.932 longitude:12.321];
[[self delegate] locationManager:self didUpdateToLocation:location fromLocation:nil];
id heading = [[MyHeading alloc] init];
[[self delegate] locationManager:sel...
When should I use a struct rather than a class in C#?
...:
don't need polymorphism,
want value semantics, and
want to avoid heap allocation and the associated garbage collection overhead.
The caveat, however, is that structs (arbitrarily large) are more expensive to pass around than class references (usually one machine word), so classes could end ...
What are the differences between a pointer variable and a reference variable in C++?
...ces and pointers do not have to take space on the stack. They can both be allocated on the heap.
– Derek Park
Sep 19 '08 at 4:33
22
...
Why Choose Struct Over Class?
...
Since struct instances are allocated on stack, and class instances are allocated on heap, structs can sometimes be drastically faster.
However, you should always measure it yourself and decide based on your unique use case.
Consider the following exa...
The new syntax “= default” in C++11
...ct in the memory started from address of variable x (instead of new memory allocation). This syntax is used to create object at pre-allocated memory. As in our case the size of B = the size of int, so new(&x)A() will create new object in the place of x variable.
– Slavenski...
UITableViewCell with UITextView height in iOS 7?
... andWidth: (CGFloat)width {
UITextView *calculationView = [[UITextView alloc] init];
[calculationView setAttributedText:text];
CGSize size = [calculationView sizeThatFits:CGSizeMake(width, FLT_MAX)];
return size.height;
}
This function will take a NSAttributedString and the desired ...
Why is exception handling bad?
...ly; since the finally block is guaranteed to be executed, objects can be deallocated there. The rest should be taken care of by variables going out of scope and garbage collection.
– Robert Harvey
Nov 17 '09 at 17:20
...
Functional programming - is immutability expensive? [closed]
...his algorithm has a very poor cache locality. I don’t know whether smart allocators in modern functional programming languages can mitigate this – but on modern machines, cache misses have become a major performance killer.
What’s the conclusion? Unlike others, I wouldn’t say that quickso...
How to play a local video with Swift?
...scussion Video Player
@code
self.videoPlayer = [[VideoPlayer alloc] initVideoPlayerWithURL:someURL playerView:self.playerView];
[self.videoPlayer prepareToPlay];
self.videoPlayer.delegate = self; //optional
//after when required play item
[self.vide...