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What is “:-!!” in C code?
...d read the expression like this:
sizeof(struct { int: -!!(e); }))
(e): Compute expression e.
!!(e): Logically negate twice: 0 if e == 0; otherwise 1.
-!!(e): Numerically negate the expression from step 2: 0 if it was 0; otherwise -1.
struct{int: -!!(0);} --> struct{int: 0;}: If it was zero, t...
Factory Pattern. When to use factory methods?
... know about the dependencies of the Thing, except for the string data that comes from the consumer.
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Where are static variables stored in C and C++?
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What's the strangest corner case you've seen in C# or .NET? [closed]
...s took some debugging to track down! (the original code was obviously more complex and subtle...)
static void Foo<T>() where T : new()
{
T t = new T();
Console.WriteLine(t.ToString()); // works fine
Console.WriteLine(t.GetHashCode()); // works fine
Cons...
Count work days between two dates
...
To clarify @Sequenzia's comment, you would REMOVE the case statements about Sunday entirely, leaving only +(CASE WHEN DATENAME(dw, @StartDate) = 'Saturday' THEN 1 ELSE 0 END) - (CASE WHEN DATENAME(dw, @EndDate) = 'Saturday' THEN 1 ELSE 0 END)
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How to benchmark efficiency of PHP script
...r is getting hammered to do a million other things as well and resources become scarce. This raises another question: are you bottlenecking on CPU? RAM? I/O?
You also need to look beyond just the code you are running in your scripts to how your scripts/pages are being served. What web server are yo...
Including all the jars in a directory within the Java classpath
...s):
java -cp "$(printf %s: lib/*.jar)"
(Note that using a classpath is incompatible with the -jar option. See also: Execute jar file with multiple classpath libraries from command prompt)
Understanding Wildcards
From the Classpath document:
Class path entries can contain the basename wildcard cha...
Are there conventions on how to name resources?
...
I don't know whether there are any official recommendations.
For ids in my layouts with widgets and containers, I use the convention:
<layout>_<widget/container>_<name>
I do the same strategy for any dimens, strings, numbers, and colors I use in tho...
Is there any way to enforce typing on NSArray, NSMutableArray, etc.?
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You could make a category with an -addSomeClass: method to allow compile-time static type checking (so the compiler could let you know if you try to add an object it knows is a different class through that method), but there's no real way to enforce that an array only contains objects of a...
Maven command to determine which settings.xml file Maven is using
How do I use maven command line to determine which settings.xml file Maven is picking up?
6 Answers
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