SIGNALSLOT + Arguments - QObject::connect

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：

not available directly in Rust Use init helpers to initialize the Compatibility of signal's and slot's arguments is checked at compile time

signal and slot arguments are not compatible In rare cases, it might be necessary to define value type arguments as pointer or reference to make signal and slot signatures compatible Therfore, use the

signal and slot 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