fig24_06.cpp

是有关C++编程原理教程的例子程序,全,应该对大家有所帮助

// Fig. 24.6: Fig24_06.cpp
// Demonstrating operators .* and ->*.
#include <iostream>
using std::cout;
using std::endl;

// class Test definition
class Test 
{
public:
   void test() 
   {
      cout << "In test function\n";
   } // end function test

   int value; // public data member
}; // end class Test

void arrowStar( Test * ); // prototype
void dotStar( Test * ); // prototype

int main()
{
   Test test;    
   test.value = 8; // assign value 8 
   arrowStar( &test ); // pass address to arrowStar
   dotStar( &test ); // pass address to dotStar
   return 0;
} // end main

// access member function of Test object using ->*
void arrowStar( Test *testPtr )
{
   void ( Test::*memPtr )() = &Test::test; // declare function pointer
   ( testPtr->*memPtr )(); // invoke function indirectly
} // end arrowStar

// access members of Test object data member using .*
void dotStar( Test *testPtr2 )
{
   int Test::*vPtr = &Test::value; // declare pointer 
   cout << ( *testPtr2 ).*vPtr << endl; // access value
} // end dotStar


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