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When is memoization automatic in GHC Haskell?
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GHC does not memoize functions.
It does, however, compute any given expression in the code at most once per time that its surrounding lambda-expression is entered, or at most once ever if it is at top level. Determining where the lambda-expressions are can...
Keyword not supported: “data source” initializing Entity Framework Context
I'm initializing Entity Framework Object context, and this gives me the keyword not supported error:
6 Answers
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Can't connect to local MySQL server through socket homebrew
I recently tried installing MySQL with homebrew ( brew install mysql ) and when I try to run it I get the following error:
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“Java DateFormat is not threadsafe” what does this leads to?
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Let's try it out.
Here is a program in which multiple threads use a shared SimpleDateFormat.
Program:
public static void main(String[] args) throws Exception {
final DateFormat format = new SimpleDateFormat("yyyyMMdd");
Ca...
Java: difference between strong/soft/weak/phantom reference
I have read this article about the topic, but I don't really understand it.
Please give me some advice along with examples when describing the concepts.
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What is in your Mathematica tool bag? [closed]
We all know that Mathematica is great, but it also often lacks critical functionality. What kind of external packages / tools / resources do you use with Mathematica?
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Real-world examples of recursion [closed]
... are lots of mathy examples here, but you wanted a real world example, so with a bit of thinking, this is possibly the best I can offer:
You find a person who has contracted a given contageous infection, which is non fatal, and fixes itself quickly( Type A) , Except for one in 5 people ( We'll call...
C# : 'is' keyword and checking for Not
... (there's no IsNot operator).
You can build an extension method that does it:
public static bool IsA<T>(this object obj) {
return obj is T;
}
and then use it to:
if (!child.IsA<IContainer>())
And you could follow on your theme:
public static bool IsNotAFreaking<T>(this ...
Run php script as daemon process
I need to run a php script as daemon process (wait for instructions and do stuff). cron job will not do it for me because actions need to be taken as soon as instruction arrives. I know PHP is not really the best option for daemon processes due to memory management issues, but due to various reasons...
Why can't a 'continue' statement be inside a 'finally' block?
...un, like a return, for example, which brings the same problem.
In short, with the semantics of finally it doesn't make sense to allow transferring control from inside a finally block to the outside of it.
Supporting this with some alternative semantics would be more confusing than helpful, since t...