How can I write a C++ type conversion operator to implicitly convert all void* to MyStruct* -

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i'm learning windows driver dev, , find problem using visualddkhelper.h c++ code(no problem c code).

the question boils down this:

// --- formal windows driver sdk header --- typedef void * handle;  // --- visualddkhelper.h --- class handle_visualddk_helper { }; typedef handle_visualddk_helper *handle_visualddk_helper_t;  #define  handle   handle_visualddk_helper_t // ★ visualddk handle tweaker  // --- user code ---  void foo(handle s) { }  //operator smy*()(void* ptr) { return (smy*)ptr; }     // how can write type conversion operator user code compiles ok.  int main() {     char* s = "abc";     class user_struct1 { int m; } *pu1 = 0;     class user_struct2 { int m; } *pu2 = 0;      foo(s);      foo(pu1);     foo(pu2); // lots of these      return 0; }

i'm unwilling convert driver code like:

foo((handle)s);  foo((handle)pu1); foo((handle)pu2); // lots of these

can c++ operator overloading me out?


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