Hidden Features of Qt

OK, the title of this post is a bit of a misnomer as the Qt documentation is so good you'd be hard pushed to find something that is truly hidden ... but I came across a great list on stackoverflow and I thought I'd share the best bits here.

• forever
  This is a macro that expands to for (;;). Very useful. You're already using foreach already right?
• qChecksum
  This returns a CRC-16 checksum of a char* buffer.
• qCompress / qUncompress
  These functions perform zlib compression/uncompression of a QByteArray. You can also specify the compression level.
  
• qFuzzyCompare
  Use this to safely compare float/double values and avoid the dreaded floating point comparison trap.
• qVersion
  Get the runtime version of Qt being used.
• qPrintable
  Converts a QString to a const char* instead of writing QString.toLocal8Bit().constData(). Very useful - I could of done with this the other day when outputting some debug strings using...
• qDebug
  Write to the debug window, in std::iostream style, e.g.:
  
  qDebug() << "String contents: " << qPrintable(myString);
  
  
• QObject::deleteLater()
  This is used to force an object to delete itself (delete this) when a signal occurs. I have used this to delete a QTcpSocket object automatically when the socket is disconnected.

There are lots more if you follow the link.