c++ event示例
IfyouwanttocreateaC++classthatcallsclients'functions(events),youcandothatintwoways.Thefirstwayistocallaglobalfunctionthroughafunctionpointerthatisaprivatememberofyourclass.Theclienthastosetthatfunctionpointerifitwantstohandlethatevent.So,yourclasshastwoconstructors,o
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