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How to detect if a script is being sourced
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This seems to be portable between Bash and Korn:
[[ $_ != $0 ]] && echo "Script is being sourced" || echo "Script is a subshell"
A line similar to this or an assignment like pathname="$_" (with a later test and actio...
Understanding typedefs for function pointers in C
...() as:
extern SignalHandler signal(int signum, SignalHandler handler);
This means the same thing, but is usually regarded as somewhat easier to read. It is clearer that the function takes an int and a SignalHandler and returns a SignalHandler.
It takes a bit of getting used to, though. The one t...
Do you (really) write exception safe code? [closed]
...deas or methods that try to improve or replace it (well, some variations exist, but nothing novel).
13 Answers
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What is the difference between URI, URL and URN? [duplicate]
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Uniform Resource Identifier (URI) is a string of characters used to identify a name or a resource on the Internet
A URI identifies a resource either by location, or a name, or both. A URI has two specializations known as URL and URN.
A Uniform Resource Loca...
What is the difference between window, screen, and document in Javascript?
...se terms used interchangeably as the global environment for the DOM. What is the difference (if there is one) and when should I use each one?
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What are the differences between Abstract Factory and Factory design patterns?
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The main difference between a "factory method" and an "abstract factory" is that the factory method is a method, and an abstract factory is an object. I think a lot of people get these two terms confused, and start using them interchangeably. I remember that I had a hard time finding exactly what ...
Is False == 0 and True == 1 an implementation detail or is it guaranteed by the language?
Is it guaranteed that False == 0 and True == 1 , in Python (assuming that they are not reassigned by the user)? For instance, is it in any way guaranteed that the following code will always produce the same results, whatever the version of Python (both existing and, likely, future ones)?
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When is JavaScript's eval() not evil?
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I'd like to take a moment to address the premise of your question - that eval() is "evil". The word "evil", as used by programming language people, usually means "dangerous", or more precisely "able to cause lots of harm with a simple-looking command". So, when is it OK...
What is the difference between currying and partial application?
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Currying is converting a single function of n arguments into n functions with a single argument each. Given the following function:
function f(x,y,z) { z(x(y));}
When curried, becomes:
function f(x) { lambda(y) { lambda(z) { z(x(y...
How expensive is the lock statement?
...rallel processing and I needed a counter to do some basic counting and statistic analysis of the speed of the processing. To avoid problems with concurrent use of my class I've used a lock statement on a private variable in my class:
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