2021-05-04 22:33:33 CST W18D2

workbench/pointer_to_members/README.md

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+## 类成员指针
+
+
+成员函数指针的调用必须通过类对象，和操作符 `.*` 或 `->*`
+
+## Reference
+
+- https://www.ibm.com/docs/en/zos/2.2.0?topic=only-pointers-members-c
+-

workbench/pointer_to_members/hello.cpp

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+#include <iostream>
+using namespace std;
+
+class X {
+   public:
+    int a;
+    void f(int b) {
+        cout << "The value of b is " << b << endl;
+    }
+};
+
+int main() {
+    // declare pointer to data member
+    //int X::*ptiptr = nullptr;
+    int X::*ptiptr = &X::a;
+
+    // declare a pointer to member function
+    void (X::*ptfptr)(int) = &X::f;
+
+    // create an object of class type X
+    X xobject;
+
+    // initialize data member
+    xobject.*ptiptr = 10;
+
+    cout << "The value of a is " << xobject.*ptiptr << endl;
+
+    // call member function
+    (xobject.*ptfptr)(20);
+}