首页typedef int(* EventHandler) (void *cobj, uint32_t event_id, void *param)

typedef int(* EventHandler) (void cobj, uint32_t event_id, void param)

时间: 2024-05-26 20:15:33 浏览: 177

c++ event示例

If you want to create a C++ class that calls clients' functions (events), you can do that in two ways. The first way is to call a global function through a function pointer that is a private member of your class. The client has to set that function pointer if it wants to handle that event. So, your class has two constructors, one with a function pointer and the other without it. If the client wants to handle an event, it has to create an instance of your class with the constructor that has a function pointer as the argument. The second way is to call a class member function of the client class through the interface that is provided with your class package. The client has to inherit that interface and implement an event function if it wants to handle that event. So, your class has two constructors, one with an event interface pointer and the other without it. If the client wants to handle an event, it has to create an instance of your class with the constructor that has a function pointer as the argument; for example, "CEvent(this)". Here is the code for both ways。

这是一个函数指针类型的定义，命名为 EventHandler。它接受三个参数，分别是 void 指针类型的 cobj，表示事件处理器所属的对象；uint32_t 类型的 event_id，表示触发的事件 ID；void 指针类型的 param，表示事件附带的参数。该函数指针返回值为 int 类型。这样定义的函数指针可以被用作回调函数，用于处理各种事件。

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