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What is the difference between a definition and a declaration?
...ion introduces an identifier and describes its type, be it a type, object, or function. A declaration is what the compiler needs to accept references to that identifier. These are declarations:
extern int bar;
extern int g(int, int);
double f(int, double); // extern can be omitted for function dec...
Best Practice: Initialize JUnit class fields in setUp() or at declaration?
... is that the class under test should be instantiated in your setUp method (or in a test method).
When the JUnit examples create an ArrayList in the setUp method, they all go on to test the behavior of that ArrayList, with cases like testIndexOutOfBoundException, testEmptyCollection, and the like. T...
Correct file permissions for WordPress [closed]
... any details on the best file permissions. I also took a look at some of WordPress's form's questions over here too but anybody that suggests 777 obviously needs a little lesson in security.
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How and where are Annotations used in Java?
What are the major areas that we can use Annotations? Is the feature a replacement for XML based configuration?
15 Answers
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Get difference between two lists
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@Drewdin: Lists do not support the "-" operand. Sets, however, do, and that what is demonstrated above if you look closely.
– Godsmith
Oct 14 '14 at 21:21
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Match whitespace but not newlines
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Perl versions 5.10 and later support subsidiary vertical and horizontal character classes, \v and \h, as well as the generic whitespace character class \s
The cleanest solution is to use the horizontal whitespace character class \h. This will match tab and ...
Test whether a glob has any matches in bash
If I want to check for the existence of a single file, I can test for it using test -e filename or [ -e filename ] .
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List or IList [closed]
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Say you had originally used List<T> and wanted to change to use a specialized CaseInsensitiveList<T>, both of which implement IList<T>. If you use the concrete type all callers need to be updated. If exposed as IList<...
How to define “type disjunction” (union types)?
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Well, in the specific case of Any*, this trick below won't work, as it will not accept mixed types. However, since mixed types wouldn't work with overloading either, this may be what you want.
First, declare a class with the types you wish to accept as below:
class StringOrInt[T]
ob...
How does Access-Control-Allow-Origin header work?
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Access-Control-Allow-Origin is a CORS (Cross-Origin Resource Sharing) header.
When Site A tries to fetch content from Site B, Site B can send an Access-Control-Allow-Origin response header to tell the browser that the content of this page is ac...