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Readonly Properties in Objective-C?
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I noticed that a class that inherits from a class that has class extension properties, will not see them. i.e inheritance only see the external interface. confirm?
– Yogev Shelly
Jul 2 '12 at 10:54
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How to duplicate object properties in another object?
... debugging. JS sucks like that, so careful coding to prevent such problems from occurring is prudent.
– Eli Bendersky
Sep 26 '13 at 21:08
2
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Why must wait() always be in synchronized block
...s true:
You can get spurious wakeups (meaning that a thread can wake up from waiting without ever having received a notification), or
The condition can get set, but a third thread makes the condition false again by the time the waiting thread wakes up (and reacquires the monitor).
To deal wit...
Proper stack and heap usage in C++?
...u do not malloc() or new) lives on the stack. It goes away when you return from the function. If you want something to live longer than the function that declared it, you must allocate it on the heap.
class Thingy;
Thingy* foo( )
{
int a; // this int lives on the stack
Thingy B; // this thing...
Static variable inside of a function in C
...ists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs ...
How to round up the result of integer division?
... it once, you don't need to store the recordsPerPage specially if it comes from an expensive function to fetch the value from a config file or something.
I.e. this might be inefficient, if config.fetch_value used a database lookup or something:
int pageCount = (records + config.fetch_value('recor...
What's the fastest way to delete a large folder in Windows?
... suggestion is the fastest. Install cygwin.com then use rm -rfv folderName from the cygwin command prompt.
– Lonnie Best
Jan 8 '13 at 20:34
1
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Test if a variable is a list or tuple
... certain type of object, it's that you artificially restrict your function from doing the right thing with unexpected object types that would otherwise do the right thing. If you have a final fallback that is not type-checked, you remove this restriction. It should be noted that too much type chec...
Iterating over every two elements in a list
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You need a pairwise() (or grouped()) implementation.
For Python 2:
from itertools import izip
def pairwise(iterable):
"s -> (s0, s1), (s2, s3), (s4, s5), ..."
a = iter(iterable)
return izip(a, a)
for x, y in pairwise(l):
print "%d + %d = %d" % (x, y, x + y)
Or, more gen...
What is the documents directory (NSDocumentDirectory)?
...le.com/library/ios/technotes/tn2406/_index.html
The Apple sanctioned way (from the link above) is as follows:
// Returns the URL to the application's Documents directory.
- (NSURL *)applicationDocumentsDirectory
{
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inD...