I just started learning Haskell and I ran into a problem in 2-adic type classes. Here's the important code: data Rectangle = NoRect | Rect (Float,Float) (Float,Float) | Pane deriving (Show) class Collision s1 s2 where collides :: s1 -> s2 -> Bool instance (Collision Rectangle Rectangle) where collides (Rect (aOrX, aOrY...
What is the name of the special Makefile variable that contains the match of %, to use in the rule body? As an example, I would like to use it like this: %.o: %.c @echo Matched $MATCH $(CC) -c $(CFLAGS) $(CPPFLAGS) $< -o $@ where I put $MATCH there because I can't remember the actual name of that special pa...
I need to replace certain user-entered URLs with embedded flash objects...and I'm having trouble with a regex that I'm using to match the url...I think mainly because the URLs are SEO-friendly and therefore a bit more difficult to parse URL structure: http://www.site.com/item/item_title_that_can_include_1('_etc-32CHARACTERALPHANUMERICGU...
Hi, This is my current code @descriptions = TableName.find(:first, :conditions=> ["table_id = ?", table_name.table_id], :order => 'author_year') author_year column contains data of kannan 1845 kohlun 1976 palani 1956 Using above code, it gives result with order of author_year based on author names. I need to order the query asce...
Imagine we have a long string containing the substrings 'cat' and 'dog' as well as other random characters, eg. cat x dog cat x cat x dog x dog x cat x dog x cat Here 'x' represents any random sequence of characters (but not 'cat' or 'dog'). What I want to do is find every 'cat' that is followed by any characters except 'dog' and the...
I am goingto be starting work soon on a new project at work. Essentially there are many chemical compounds here each has its own prefix / identifier. For example a couple of chars followed by a few ints and that sort of thing, tho they all vary. I was wondering if there was an algorithm for matching these elements efficiently, opposed t...