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What does the exclamation mark mean in a Haskell declaration?
...ok at an example, so that we can see just what this means:
data Foo = Foo Int Int !Int !(Maybe Int)
f = Foo (2+2) (3+3) (4+4) (Just (5+5))
The function f above, when evaluated, will return a "thunk": that is, the code to execute to figure out its value. At that point, a Foo doesn't even exist ye...
Debugging with command-line parameters in Visual Studio
...
The Mozilla.org FAQ on debugging Mozilla on Windows is of interest here.
In short, the Visual Studio debugger can be invoked on a program from the command line, allowing one to specify the command line arguments when invoking a command line program, directly on the command line.
T...
Mutex example / tutorial? [closed]
...td::mutex m;//you can use std::lock_guard if you want to be exception safe
int i = 0;
void makeACallFromPhoneBooth()
{
m.lock();//man gets a hold of the phone booth door and locks it. The other men wait outside
//man happily talks to his wife from now....
std::cout << i <&...
Controlling mouse with Python
...api.mouse_event(win32con.MOUSEEVENTF_MOVE | win32con.MOUSEEVENTF_ABSOLUTE, int(x/SCREEN_WIDTH*65535.0), int(y/SCREEN_HEIGHT*65535.0)) in my experience for better integration with other application such as games.
– Falcon
May 31 '12 at 18:59
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How can one see the structure of a table in SQLite? [duplicate]
...todos_server_snapshot
sqlite> .schema alarms
CREATE TABLE alarms (ROWID INTEGER PRIMARY KEY AUTOINCREMENT, alarm_id,
todo INTEGER, flags INTEGER, offset_days INTEGER,
reminder_date INTEGER, time INTEGER, argument,
unrecognized_data BL...
How to get a pixel's x,y coordinate color from an image?
... 4) {
console.log pix[i+3]
}
This will go row by row, so you'd need to convert that into an x,y and either convert the for loop to a direct check or run a conditional inside.
Reading your question again, it looks like you want to be able to get the point that the person clicks on. This can be d...
Group by in LINQ
...:
var results = from p in persons
group p.car by p.PersonId into g
select new { PersonId = g.Key, Cars = g.ToList() };
Or as a non-query expression:
var results = persons.GroupBy(
p => p.PersonId,
p => p.car,
(key, g) => new { PersonId = key, Car...
Pair/tuple data type in Go
...nal exercise of the Tour of Go , I decided I needed a queue of ( string , int ) pairs. That's easy enough:
3 Answers
...
A monad is just a monoid in the category of endofunctors, what's the problem?
... = μ ∘ ηT = 1 (the identity natural transformation)
With a bit of squinting you might be able to see that both of these definitions are instances of the same abstract concept.
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Cocoa Core Data efficient way to count entities
...t subentities. Default is YES (i.e. include subentities)
NSError *err;
NSUInteger count = [moc countForFetchRequest:request error:&err];
if(count == NSNotFound) {
//Handle error
}
[request release];
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