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Indenting #defines
.... Use which ever style (space before "#" or space between "#" and the identifier) you prefer.
http://www.delorie.com/gnu/docs/gcc/cpp_48.html
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Ball to Ball Collision - Detection and Handling
...re the velocities after the collision, and u1, u2 are from before):
If the balls have the same mass then the velocities are simply switched. Here's some code I wrote which does something similar:
void Simulation::collide(Storage::Iterator a, Storage::Iterator b)
{
// Check whether there ...
Waiting on a list of Future
...e a CompletionService to receive the futures as soon as they are ready and if one of them throws an exception cancel the processing. Something like this:
Executor executor = Executors.newFixedThreadPool(4);
CompletionService<SomeResult> completionService =
new ExecutorCompletionServic...
Inputting a default image in case the src attribute of an html is not valid?
...t;img> tag, in case the src attribute is invalid (using only HTML)? If not, what would be your lightweight way to work around it?
...
导盲项目：什么场景非得用相机预览？按杖上按钮或定时拍照，识别后语音提醒...
...
global 就绪 = false
global 忙碌 = false
procedure 请求拍照() {
if (就绪 and not 忙碌) {
忙碌 = true
标签_状态.Text = "拍照中…"
实时预览录制1.CapturePhoto()
}
}
when Screen1.Initialize() {
Screen1.AskForPermission("android.permission.CAMERA")
}
when ...
How to use a switch case 'or' in PHP
...
If you must use || with switch then you can try :
$v = 1;
switch (true) {
case ($v == 1 || $v == 2):
echo 'the value is either 1 or 2';
break;
}
If not your preferred solution would have been
switch(...
How does TransactionScope roll back transactions?
...base connections. When you open a DB connection the connections will looks if there is an ambient transaction (Transaction Scope) and if so enlist with it. Caution if there are more the one connection to the same SQL server this will escalate to a Distribtued Transaction.
What happens since you're...
Difference between ObservableCollection and BindingList
I want to know the difference between ObservableCollection and BindingList because I've used both to notify for any add/delete change in Source, but I actually do not know when to prefer one over the other.
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IllegalArgumentException or NullPointerException for a null parameter? [closed]
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It seems like an IllegalArgumentException is called for if you don't want null to be an allowed value, and the NullPointerException would be thrown if you were trying to use a variable that turns out to be null.
...
How to send a simple string between two programs using pipes?
... will vanish when the last process closes it.
A named pipe, also called a FIFO for its behavior, can be used to connect two unrelated processes and exists independently of the processes; meaning it can exist even if no one is using it. A FIFO is created using the mkfifo() library function.
Example
...