How to: Override Default Access of add, remove, and raise Methods
This sample shows how to override the default access on the add, remove, and raise events methods.
Example
// mcppv2_events3.cpp
// compile with: /clr
public delegate void f(int);
public ref struct E {
f ^ _E;
public:
void handler(int i) {
System::Console::WriteLine(i);
}
E() {
_E = nullptr;
}
event f^ Event {
void add(f ^ d) {
_E += d;
}
private:
void remove(f ^ d) {
_E -= d;
}
protected:
void raise(int i) {
if (_E) {
_E->Invoke(i);
}
}
}
// a member function to access all evednt methods
static void Go() {
E^ pE = gcnew E;
pE->Event += gcnew f(pE, &E::handler);
pE->Event(17); // prints 17
pE->Event -= gcnew f(pE, &E::handler);
pE->Event(17); // no output
}
};
int main() {
E::Go();
}
Output
17