HOWTO: Connect Boost Signals & Slots to Qt Signals & Slots
Hello everyone, Please find the first in a series of articles here: http://www.oxforddynamics.com/articles/connect_qt_and_boost_signals_and_slot... I hope it will be of use! Moderators: is this type of post is acceptable or not? Please let me know if it isn't and I won't post Boost related HOWTOs here again. Kind Regards, John
On 4/22/2013 4:27 AM, John Adamson wrote:
I haven't compiled the examples, but in my Qt4.8.4 implementation at 52 of qobjectdefs.h I see: #define Q_EMIT So what effect does it have in the below code? lib_ptr_->signal_1.connect( boost::bind( &Ui::Q_EMIT slot1 , this ) ); Thanks, Jeff
Hi Jeff,
I wouldn't recommend that! Q_EMIT is the alternative macro for the 'emit'
keyword. You need to define QT_NO_KEYWORDS to work with Boost.Signals, but
that prevents the use of the 'emit' keyword.
Please read the short section:
http://www.oxforddynamics.com/articles/connect_qt_and_boost_signals_and_slot...
John
On 23 April 2013 17:48, Jeff Flinn
Hi John, Please don't top post. I'm rearranging to make this more readable. On 4/23/2013 11:55 AM, John Adamson wrote:
Recommend what? I'm just asking a question about what effect Q_EMIT has on getting the above line of code to compile given that in Qt4.8.4 (if not all versions) Q_EMIT /emit is defined to nothing? My understanding is that these keywords are just used to 'document' for the human reader that a signal/slot is being called.
'emit' keyword. You need to define QT_NO_KEYWORDS to work with Boost.Signals, but that prevents the use of the 'emit' keyword.
We never use those poorly chosen lower case macro names and always define QT_NO_KEYWORDS as a matter of best practices. Jeff
On 23 April 2013 18:49, Jeff Flinn
Hello again Jeff, I have not replied here before and did not anticipate my reply would be 'top-posted'. Thank you for correcting it. You phrased your question badly (it wasn't clear why you made it look like you were redefining Q_EMIT) but I see what you meant now. I don't want this to descend into a post about Qt only so I'll simply say: yes, you don't need the Q_EMIT keyword. To avoid confusion I have also updated the article. John
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John Adamson