How Qt Signals and Slots Work

signal and slot arguments are not compatible
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Copied or Not Copied: Arguments in Signal-Slot Connections? How often is a an object copied, if it is emitted by a signal as a const reference

signalslot system ensures the type-correctness of callback arguments Similarly, the signalslot system can be used for other non-GUI usages, for

signal and slot Since the signatures are compatible, the compiler can help The rule about whether to include arguments or not in the SIGNAL() and SLOT

signal slot QT编译错误: Signal and slot arguments are not compatible 原因如下： 信号和插槽参数不兼容。 当时把connect函数写成了这样子：