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As you might have seen in the previous example, the slot was just declared as public and not as slot. Qt will indeed call directly the function pointer of the slot, and will not need moc introspection anymore. (It still needs it for the signal) But what we can also do is connecting to any function or functor. Learn the advantages of signals/slots; Understand the concept of signal/slots; Learn how to connect signals to slots; Be able to use and define your own signals/slots; Meta-Object System. Extends C with dynamic features. Features such as Mechanism to access any function in the class (used by signals and slots) Class information.

• Status:Closed
• Resolution: Cannot Reproduce
• Fix Version/s: None
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Please find the test attached, it should create an app with a visible main window, and set a single shot timer to automatically quit it after running for a second or so.
It tries to connect a QTimer's timeout signal to the QApplication's quit slot by passing their object pointers and member function pointers to QObject::connect, but that fails to return a valid connection when built for x86_64 with an Intel Compiler (14.0 and 15.0 tested)

A similar problem was reported against 5.3.1 already, but was closed out:
https://bugreports.qt.io/browse/QTBUG-40281

The problem exists in the subsequent releases we've tested, up to and including the most recent, 5.5.0.

Qt Signal Slot Parameter

The problem is the way the Qt's new overloaded QObject::connect methods try to identify an object's signal from a member function pointer (MFP). It's based on a false assumption that MFP values can be cast to a void* values for equlity comparisons. The ISO C++ standard specifies that casting an MFP to void* is illegal and its behavior undefined. How to win online poker mtt. See explanation here:
https://isocpp.org/wiki/faq/pointers-to-members#cant-cvt-memfnptr-to-voidptr

Qt Signal Slot Thread

Though the mechanism may happen to work with certain compilers (like GCC's) that's unreliable, and looking at GCC 4.8.1's MFP types for x86_64, they are actually 16 bytes, twice the size of a regular pointer (like void*), so only the first half of its data is actually being compared! The Intel compiler's MFP types for x86_64 are also 16 bytes.

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SUGGESTED FIX:
The inline template definitions of the new overloaded QObject::connect methods that currently do the illegal casting seem to have sufficient type information to perform signal identification cleanly if the sender object's known signals were made available as a set of static tables (created by MOC say), one for each distinct signal signature used (C++ allows MFP's of the same type can be compared directly). The tables could be used to map a matched object signal MFP to its signal identifier string (i.e. what the SIGNAL() macro provides in the old syntax) for passing to the core connect implementation. Where to buy poker table felt.

• Assignee:

  Thiago Macieira

  Reporter:

  Qt Support

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Pointer To Qwidget In Signals And Slots

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  Updated:

  Resolved: