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How to delete or add column in SQLITE?
...is case, after doing this sequence one must call PRAGMA foreign_keys=ON in order to re-enable foreign keys.
– PazO
Apr 11 '18 at 9:12
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Functional programming - is immutability expensive? [closed]
...storage in the form of stack space for the recursive step, which is in the order of O(log n) in the best case, but O(n) in the worst case.
Implementing a functional variant of quicksort that operates on arrays defeats the purpose. Arrays are never immutable.
The “proper” functional implementatio...
How to Load an Assembly to AppDomain with all references recursively?
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You use the proxy class in order to avoid the new assembly from being loaded in to your caller domain. If you'll use Assembly.LoadFrom(string), the caller domain will try to load the new assembly references and won't find them because it doesn't search...
Read properties file outside JAR file
...In your project just put the java.properties file in your project root, in order to make this code work from your IDE as well.
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Calculate the median of a billion numbers
...ion first[*]. It writes its data back to the control machine in increasing order as soon as it can (using asynchronous IO so as to continue sorting, and probably with Nagle on: experiment a bit).
The control machine performs a 99-way merge on the data as it arrives, but discards the merged data, ju...
Rails: How does the respond_to block work?
... a bit. The entire class (responder) becomes the method implementation. In order to leverage method_missing, we need an instance of the class, so we're obliged to pass a callback into which they pass the method-like object. For someone who has coded in C-like languages for 20 some years, this is ver...
How do synchronized static methods work in Java and can I use it for loading Hibernate entities?
... Any fast food restaurant uses multithread. One thread takes you order and use another thread to prepare it, and continues with the next customer. The synchronization point works only when they interchange information to know what to prepare. Following a model like that really simplifies ...
What does the slash mean in help() output?
...and there are only a few arguments which will always be passed in the same order.
Use keyword-only when names have meaning and the function definition is more understandable by being explicit with names.
If the function ends with /
def foo(p1, p2, /)
This means all functional arguments a...
Getting the max value of an enum
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Enum.GetValues() seems to return the values in order, so you can do something like this:
// given this enum:
public enum Foo
{
Fizz = 3,
Bar = 1,
Bang = 2
}
// this gets Fizz
var lastFoo = Enum.GetValues(typeof(Foo)).Cast<Foo>().Last();
Edit
For th...
What is the performance cost of having a virtual method in a C++ class?
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I ran some timings on a 3ghz in-order PowerPC processor. On that architecture, a virtual function call costs 7 nanoseconds longer than a direct (non-virtual) function call.
So, not really worth worrying about the cost unless the function is something lik...