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How do I implement an Objective-C singleton that is compatible with ARC?
...[self allocWithZone:nil];
}
+ (id)allocWithZone:(NSZone *)zone
{
[self doesNotRecognizeSelector:_cmd];
abort();
}
+ (instancetype)theController
{
static AAA* c1 = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^
{
c1 = [[super allocWithZone...
CSV API for Java [closed]
... Unfortunately, OpenCSV's latest download (v2.2 at time of comment) does not compile, and they don't provide a pre-built binary.
– opyate
Mar 21 '11 at 21:24
9
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How to count total number of watches on a page?
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Does it take into account the new one-time binding feature? Does your count skip this kind of binding?
– systempuntoout
Oct 20 '14 at 22:24
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How can I beautify JavaScript code using Command Line?
...ense in a browser context, but do in a console context. The function print does what you'd expect, and prints out a string. The function readFile accepts a file path string as an argument and returns the contents of that file.
You'd invoke the above something like
java -cp js.jar org.mozilla....
Is there any way to specify a suggested filename when using data: URI?
...<a> and click it: jsfiddle.net/flyingsheep/wpQtH (no, $(...).click() doesn’t work)
– flying sheep
Mar 16 '12 at 18:31
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Constructor of an abstract class in C#
...patterns like allowing Rectangle be a subclass of Square even though it is does not maintain the same invariants and is not strictly substitutable.
– GrandOpener
Sep 22 '15 at 14:48
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Difference between Python's Generators and Iterators
...class has a __next__ method (next in Python 2) and an __iter__ method that does return self.
Every generator is an iterator, but not vice versa. A generator is built by calling a function that has one or more yield expressions (yield statements, in Python 2.5 and earlier), and is an object that mee...
How dangerous is it to compare floating point values?
... point values are not "random" in their behavior. Exact comparison can and does make sense in plenty of real-world usages. But if you're going to use floating point you need to be aware of how it works. Erring on the side of assuming floating point works like real numbers will get you code that quic...
Open two instances of a file in a single Visual Studio session
...up
If New Window is not listed in the *Window menu note that the command does exist, even as of Visual Studio 2017. Add it to the Window menu using menu Tools → Customize → Commands. At that point decide where to put the New Window command and select Add Command.
UPDATED on "30 July 2018...
Can table columns with a Foreign Key be NULL?
...cause of the foreign key constraint, since we tried to insert a value that does not exist in the parent table.
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