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QMutex in Qt4

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AP.Sakkthivel

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Friday, August 5th 2005, 11:11am

QMutex in Qt4

This is the statement i am using to initialize the static mutex
QMutex Thread::Mutex = QMutex();
in Qt 3;

what could be its peer in Qt4;

since the above statement is not compiled when i use Qt4 GPL for win with minGW

any guess

Thanx in Advance
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- $akthi

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jacek

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Friday, August 5th 2005, 11:14am

RE: QMutex in Qt4

Quoted

Originally posted by AP.Sakkthivel
since the above statement is not compiled when i use Qt4 GPL for win with minGW

Could you post the exact error message?
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AP.Sakkthivel

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Friday, August 5th 2005, 11:21am

RE: QMutex in Qt4

C:/Qt/4.0.0/include/QtCore/../../src/corelib/thread/qmutex.h:63: error: `QMutex:
:QMutex(const QMutex&)' is private
Thread.cpp:95: error: within this context
C:/Qt/4.0.0/include/QtCore/../../src/corelib/thread/qmutex.h:63: error: `QMutex:
:QMutex(const QMutex&)' is private
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- $akthi

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jacek

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Friday, August 5th 2005, 11:22am

RE: QMutex in Qt4

Then try this:

Source code

 
1

QMutex Thread::Mutex;
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AP.Sakkthivel

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Friday, August 5th 2005, 11:25am

RE: QMutex in Qt4

Yha Jacek

I did the same exactly but my question is
cant we use Constuctor for initializing

Thanx to reply

cheers
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- $akthi

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jacek

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Friday, August 5th 2005, 11:37am

RE: QMutex in Qt4

Quoted

Originally posted by AP.Sakkthivel
I did the same exactly but my question is
cant we use Constuctor for initializing

A construtor is always executed.

In this code:

Source code

 
1

QMutex Thread::Mutex = QMutex();
you create an anonymous, temporary object and assign it (using the copy constructor) to your static variable. It's equivalent to:

Source code

 
1

QMutex Thread::Mutex(QMutex());
It doesn't work, because the copy constructor is private --- how should a copy of a mutex behave?
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AP.Sakkthivel

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Friday, August 5th 2005, 11:52am

RE: QMutex in Qt4

I am NOT clear with you

but the same code worked in Qt3 version without any problem

can you say why?

Thanks for reply
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- $akthi

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This post has been edited 1 times, last edit by "AP.Sakkthivel" (Aug 5th 2005, 11:53am)

jacek

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Friday, August 5th 2005, 12:04pm

RE: QMutex in Qt4

Quoted

Originally posted by AP.Sakkthivel
can you say why?

Either you didn't have Q_DISABLE_COPY macro defined in Qt3 or you were using different compiler, that optimized your code and threw away that unnecessary temporary object.
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This post has been edited 1 times, last edit by "jacek" (Aug 5th 2005, 12:04pm)