Baffled Celebrity Big Brother viewers all ask the same question about Patsy Palmer as she makes her first appearance in the Diary Room
Tory MP Michael Fabricant opens up about his polyamorous lifestyle to drag queen Danny Beard as he reveals partner of 35 years as well as several 'deep friendships' on Celebrity Big Brother
Arsenal 3-0 Real Madrid: Declan Rice scores TWO stunning free-kicks with Mikel Merino also on target as rampant Gunners put one foot in Champions League semi-finals
Laser-cooled chips: Maybe coming soon-ish to a datacenter near you
A startup backed by Sandia National Laboratories thinks it's found a cool new way to keep the world's supercomputers and datacenters cool enough to run efficiently: Zap ‘em with lasers.…
Shocking moment man stalks woman as she walks with groceries before tearing phone from her hands - as snatchers plague residential streets
Major health update for Virginia Giuffre as Epstein victim dodges the media spotlight outside court - after she claimed she only had 'four days to live'
Police hunt for Essex man wanted in connection with Harlow thefts
Universal theme park opening date confirmed as huge new attraction being built a short drive from Essex
Canvey's Fantasy Island to massively expand along the seafront with new attractions expected
TOWIE couple SPLIT after seven years together as 'heartbroken' star's famous friends gather around her during 'painful' and 'lonely' time
What secret swingers REALLY want you to know: TRACEY COX speaks to committed couples who visit sex clubs to sleep with other people - and finds out what happens when their friends and family discover their bedroom habits
Essex teacher banned from the classroom for life following drink driving offences
Parkrun embroiled in transgender 'bigoted bullying' row as race director tells former Olympian to 'f*** off' - and Martina Navratilova piles in
Petite blonde jail boss brought down by a pair of Hugo Boss flip-flops and the DNA of her drugs kingpin lover
Three men arrested at Stansted Airport after £20k horde of stolen goods discovered
Astonishing moment driver shoots off a 40ft unfinished bridge after getting confused by Google Maps - with a miraculous landing
Morbidly obese death row inmate's final meal revealed as he's executed after claiming to be too fat for lethal injection
A1017 crash leaves motorcylist with serious injuries as police appeals for witnesses
CodeSOD: Single or Mingle
Singletons is arguably the easiest to understand design pattern, and thus, one of the most frequently implemented design patterns, even- especially- when it isn't necessary. Its simplicity is its weakness.
Bartłomiej inherited some code which implemented this pattern many, many times. None of them worked quite correctly, and all of them tried to create a singleton a different way.
For example, this one:
public class SystemMemorySettings { private static SystemMemorySettings _instance; public SystemMemorySettings() { if (_instance == null) { _instance = this; } } public static SystemMemorySettings GetInstance() { return _instance; } public void DoSomething() { ... // (this must only be done for singleton instance - not for working copy) if (this != _instance) { return; } ... } }The only thing they got correct was the static method which returns an instance, but everything else is wrong. They construct the instance in the constructor, meaning this isn't actually a singleton, since you can construct it multiple times. You just can't use it.
And you can't use it because of the real "magic" here: DoSomething, which checks if the currently active instance is also the originally constructed instance. If it isn't, this function just fails silently and does nothing.
A common critique of singletons is that they're simply "global variables with extra steps," but this doesn't even succeed at that- it's just a failure, top to bottom.
Clean Energy Powered 40% of Global Electricity in 2024, Report Finds
Read more of this story at Slashdot.