How the QReadLocker construction forces to give a variable name?

[pium]

Hi all,

I would like to do the same as QT when for some class it is obliged to give a variable name.
For example QReadLocker, QWriteLocker, QMutexLocker.

It is not possible to declare

QReadWriteLock *myReadWriteLock = new QReadWriteLock();
QReadLocker( myReadWriteLock );

QReadWriteLock *myReadWriteLock = new QReadWriteLock();
QReadLocker( myReadWriteLock );

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but you have to give a variable name

QReadWriteLock *myReadWriteLock = new QReadWriteLock();
QReadLocker myReadLocker( myReadWriteLock );

QReadWriteLock *myReadWriteLock = new QReadWriteLock();
QReadLocker myReadLocker( myReadWriteLock );

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How is it achieved? I can't figure what in the code is done to obtain this behaviour.

Thanks for your help, I am delighted to learn something new in c++!

-- pium