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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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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...
What is the difference between JSON and Object Literal Notation?
...t JSON actually is. JSON is a textual, language-independent data-exchange format, much like XML, CSV or YAML.
Data can be stored in many ways, but if it should be stored in a text file and be readable by a computer, it needs to follow some structure. JSON is one of the many formats that define such...
Hibernate Annotations - Which is better, field or property access?
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I prefer accessors, since I can add some business logic to my accessors whenever I need.
Here's an example:
@Entity
public class Person {
@Column("nickName")
public String getNickName(){
if(this.name != null) return generateFunny...
No == operator found while comparing structs in C++
Comparing two instances of the following struct, I receive an error:
8 Answers
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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...
Git “error: The branch 'x' is not fully merged”
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Note Wording changed in response to the commments. Thanks @slekse
That is not an error, it is a warning. It means the branch you are about to delete contains commits that are not reachable from any of: its upstream branch, or HEAD ...
The Guava library: What are its most useful and/or hidden features? [closed]
...uava API and the new collection types it provides( Multimap and BiMap for example appear useful) and I am thinking of including the library in the project(s) I work on.
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Logout: GET or POST?
This question is not about when to use GET or POST in general; it is about which is the recommended one for handling logging out of a web application. I have found plenty of information on the differences between GET and POST in the general sense, but I did not find a definite answer for this parti...
ie8 var w= window.open() - “Message: Invalid argument.”
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This is an old posting but maybe still useful for someone.
I had the same error message. In the end the problem was an invalid name for the second argument, i.e., I had a line like:
window.open('/somefile.html', 'a window title', 'width=300');
The problem was 'a wi...