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What does the brk() system call do?
... set the break address to the end of the data segment. The first call to malloc would then use sbrk to move the break up and create the heap in between the top of the data segment and the new, higher break address, as shown in the diagram, and subsequent use of malloc would use it to make the heap ...
When to use ' (or quote) in Lisp?
...hash tables.
This is where quote comes in. Say you want to plot resource allocations from a Python application, but rather do the plotting in Lisp. Have your Python app do something like this:
print("'(")
while allocating:
if random.random() > 0.5:
print(f"(allocate {random.randin...
Retain cycle on `self` with blocks
... it. And in fact, if you use blockSelf in these cases the object can get dealloc'd before you get the result back from the block and then it will crash when it tries to call it, so clearly you want self to be retained until the response comes back.
First case demonstrates when a retain cycle will ...
Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC?
... if (sharedInstance == nil) {
sharedInstance = [[MyClass alloc] init];
}
}
return sharedInstance;
}
The benefit of dispatch_once() over this is that it's faster. It's also semantically cleaner, because it also protects you from multiple threads doing alloc init of...
Can you attach a UIGestureRecognizer to multiple views?
...matically UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(didPressed:)]; [self.view1 addGestureRecognizer:tapRecognizer]; [self.view2 addGestureRecognizer:tapRecognizer]; Output view1 has no gesture recognizers array ; view2 has got ges...
What is the difference between visibility:hidden and display:none?
...h you can still interact with it through the dom). There will be no space allocated for it between the other tags.
visibility:hidden means that unlike display:none, the tag is not visible, but space is allocated for it on the page. The tag is rendered, it just isn't seen on the page.
For exampl...
Convert integer into byte array (Java)
...
Have a look at the ByteBuffer class.
ByteBuffer b = ByteBuffer.allocate(4);
//b.order(ByteOrder.BIG_ENDIAN); // optional, the initial order of a byte buffer is always BIG_ENDIAN.
b.putInt(0xAABBCCDD);
byte[] result = b.array();
Setting the byte order ensures that result[0] == 0xAA, re...
How do I find where an exception was thrown in C++?
...bt]: (8) ./test(__libc_start_main+0x95) [0x42017589]
[bt]: (9) ./test(__eh_alloc+0x3d) [0x8048b21]
signal 6 (Aborted), address is 0x1239 from 0x42029331
crit_err_hdlr backtrace returned 13 frames
[bt]: (1) ./test(kill+0x11) [0x42029331]
[bt]: (2) ./test(abort+0x16e) [0x4202a8c2]
[bt]: (3) ./test [...
How to find largest objects in a SQL Server database?
... i.object_id = p.object_id AND i.index_id = p.index_id
INNER JOIN
sys.allocation_units a ON p.partition_id = a.container_id
WHERE
t.name NOT LIKE 'dt%' AND
i.object_id > 255 AND
i.index_id <= 1
GROUP BY
t.name, i.object_id, i.index_id, i.name
ORDER BY
object_name...
iOS 7 style Blur view
... [master repo]
I added it by using:
FXBlurView *blurView = [[FXBlurView alloc] initWithFrame:CGRectMake(50, 50, 150, 150)];
[self.blurView setDynamic:YES];
[self.view addSubview:self.blurView];
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