src/tests/misc/rtti-test.cpp

   1 #include <stdio.h>
   2
   3 #include <string>
   4 #include <typeinfo>
   5
   6 #include <Directory.h>
   7 #include <File.h>
   8
   9 using std::string;
  10
  11 struct A {
  12         A()     {}
  13         virtual ~A() {}
  14
  15         int a;
  16 };
  17
  18 struct B : A {
  19         B()     {}
  20         virtual ~B() {}
  21
  22         int b;
  23 };
  24
  25 struct C : A {
  26         C()     {}
  27         virtual ~C() {}
  28
  29         int c;
  30 };
  31
  32 template<typename A, typename B, typename C>
  33 static void
  34 rtti_test(A *a, const char *inputClass, const char *classNameA,
  35         const char *classNameB, const char *classNameC)
  36 {
  37         printf("class %s\n", inputClass);
  38         printf("  dynamic_cast<%s*>(a): %p\n", classNameA, dynamic_cast<A*>(a));
  39         printf("  dynamic_cast<%s*>(a): %p\n", classNameB, dynamic_cast<B*>(a));
  40         printf("  dynamic_cast<%s*>(a): %p\n", classNameC, dynamic_cast<C*>(a));
  41         const std::type_info *info = &typeid(*a);
  42         printf("  typeinfo: %p, name: %s\n", info, (info ? info->name() : NULL));
  43 }
  44
  45 int
  46 main()
  47 {
  48         // test with artificial classes defined in this file
  49
  50         #define RTTI_TEST(obj, className) rtti_test<A, B, C>(obj, className, \
  51                 "A", "B", "C")
  52
  53         A a;
  54         B b;
  55         C c;
  56
  57         printf("A: %p (vtable: %p)\n", &a, *(void**)&a);
  58         printf("B: %p (vtable: %p)\n", &b, *(void**)&b);
  59         printf("C: %p (vtable: %p)\n", &c, *(void**)&c);
  60
  61         RTTI_TEST(&a, "A");
  62         RTTI_TEST(&b, "B");
  63         RTTI_TEST(&c, "C");
  64
  65
  66         // test with real classes defined in a library
  67
  68         #undef RTTI_TEST
  69         #define RTTI_TEST(obj, className) rtti_test<BNode, BFile, BDirectory>(obj, \
  70                 className, "BNode", "BFile", "BDirectory")
  71
  72         BNode node;
  73         BFile file;
  74         BDirectory dir;
  75
  76         printf("BNode:      %p (vtable: %p)\n", &node, *(void**)&node);
  77         printf("BFile:      %p (vtable: %p)\n", &file, *(void**)&file);
  78         printf("BDirectory: %p (vtable: %p)\n", &dir, *(void**)&dir);
  79
  80         RTTI_TEST(&node, "BNode");
  81         RTTI_TEST(&file, "BFile");
  82         RTTI_TEST(&dir, "BDirectory");
  83
  84         return 0;
  85 }