dylon’s gists

dylon / gist:f4c91d48b940800ca324

Created June 19, 2015 03:35

	::: Query Term: Jvaa

	@ -> 4
	A -> 4
	B -> 4
	C -> 4
	D -> 4
	E -> 4
	F -> 4
	G -> 4

dylon / multimethods-under-varying-relationship-hierarchies.clj

Last active December 30, 2015 18:09

Demonstrates how to dispatch on multimethods with relationship hierarchies other than the global hierarchy. In Clojure, multimethods compare dispatch values using isa?, which operates on a relationship hierarchy that may be overridden via the ":hierarchy" option to defmulti.

	(def h (atom (make-hierarchy)))

	(swap! h derive ::a ::b)

	;-> "(isa? user/a user/b), under the global hierarchy: false"
	(println "(isa? user/a user/b), under the global hierarchy:" (isa? ::a ::b))

	;-> "(isa? user/a user/b), under the hierarchy, h: true"
	(println "(isa? user/a user/b), under the hierarchy, h:" (isa? @h ::a ::b))

dylon / ExtensionMethodTest.java

Created September 15, 2013 05:15

Demonstrates how to use lombok's @ExtensionMethod annotation on objects and primitive types.

	import lombok.ExtensionMethod;

	@ExtensionMethod(Extensions.class)
	public class ExtensionMethodTest {

	public static void main(final String... args) {
	System.out.println(args.isNull()); //-> false
	System.out.println(null.isNull()); //-> true

	int i = 0;

dylon / ValidateTest.java

Last active December 23, 2015 02:39

Demonstrates how to use lombok-pg 0.11.3's @Validate and @Validate.With annotations

	import lombok.Validate;

	public class ValidateTest {
	public static void main(final String... args) {
	foo(0); //-> Passes validation (0 is the most-even number)
	foo(1); //-> IllegalArgumentException: The object 'i' (argument #1) is invalid
	}

	@Validate //-> Required for @Validate.With(*) to be detected
	private static void foo(@Validate.With("isEven") final Integer i) {

dylon / YieldTest.java

Created September 15, 2013 04:37

Demonstrates how to use lombok-pg 0.11.3's yield statement to create a generator function (i.e. lazy sequence).

	import static lombok.Yield.yield;

	public class YieldTest {
	public static void main(final String... args) {
	for (int i : evens()) {
	System.out.println(i);
	}
	}

	private static Iterable<Integer> evens() {

dylon / WeightedRandomTest.java

Last active December 22, 2015 10:59

Demonstrates how to randomly sort a collection of elements, where each class may have a different weight (all weights must be non-negative and sum to 1.0)

	import java.util.Map;
	import java.util.HashMap;

	public class WeightedRandomTest {
	private static final int NUM_CLASSIFICATIONS = 1_000_000;

	private static Classification classify() {
	double factor = Math.random();
	for (final Classification classification : Classification.values()) {
	factor -= classification.getWeight();

dylon / .bash_profile

Last active November 18, 2024 23:43

How to get 256 colors in a standard Linux terminal + screen (without X windows).

	# ...

	# This is for what I would consider a standard setup, where TTY's 1 -- 6 are
	# "linux" terminals and TTY's 7+ are reserved for X windows. You should adjust
	# it to your setup, accordingly.
	#
	# ::: Important ::: You must have both fbterm and screen installed and on your
	# path for this to work.

	virtual_terminal="$( tty \| grep -oE ....$ )"

dylon / union_of_structs_and_classes_in_holy_matrimony.cpp

Last active December 15, 2015 08:29

Stupid C++ Tricks

	#include <stdio.h>

	struct Foo {
	const int baz;
	Foo(const int baz) : baz(baz) {}
	};

	struct Qux : public Foo {
	Qux(const int baz) : Foo(baz) {}
	};

dylon / nodes.sql

Created December 21, 2011 19:40

Example for http://stackoverflow.com/questions/8580003/select-root-node-from-subtree-postgresql-ltree-query-which-returns-several-de

	BEGIN;

	CREATE EXTENSION IF NOT EXISTS LTREE;

	/*==============================================================================
	Define the tables.
	==============================================================================*/

	CREATE TABLE nodes
	(

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