Convert more interfaces to the new thunk system.

ppapi/shared_impl/function_group_base.h

Index: ppapi/shared_impl/function_group_base.h
===================================================================
--- ppapi/shared_impl/function_group_base.h	(revision 87260)
+++ ppapi/shared_impl/function_group_base.h	(working copy)
@@ -5,51 +5,48 @@
 #ifndef PPAPI_SHARED_IMPL_FUNCTION_GROUP_BASE_H_
 #define PPAPI_SHARED_IMPL_FUNCTION_GROUP_BASE_H_
 
+#include <stddef.h>  // For NULL.
+
+#define FOR_ALL_PPAPI_FUNCTION_APIS(F) \
+  F(PPB_CharSet_FunctionAPI) \
+  F(PPB_CursorControl_FunctionAPI) \
+  F(PPB_Find_FunctionAPI) \
+  F(PPB_Font_FunctionAPI) \
+  F(ResourceCreationAPI)
+
 namespace ppapi {
 
+// Forward declare all the function APIs.
 namespace thunk {
-class PPB_CharSet_FunctionAPI;
-class PPB_CursorControl_FunctionAPI;
-class PPB_Font_FunctionAPI;
-class ResourceCreationAPI;
-}
+#define DECLARE_FUNCTION_CLASS(FUNCTIONS) class FUNCTIONS;
+FOR_ALL_PPAPI_FUNCTION_APIS(DECLARE_FUNCTION_CLASS)
+#undef DECLARE_FUNCTION_CLASS
+}  // namespace thunk
 
 class FunctionGroupBase {
  public:
+  virtual ~FunctionGroupBase();
+
   // Dynamic casting for this object. Returns the pointer to the given type if
-  // it's supported.
-  virtual thunk::PPB_CharSet_FunctionAPI* AsCharSet_FunctionAPI() {
-    return NULL;
-  }
-  virtual thunk::PPB_CursorControl_FunctionAPI* AsCursorControl_FunctionAPI() {
-    return NULL;
-  }
-  virtual thunk::PPB_Font_FunctionAPI* AsFont_FunctionAPI() {
-    return NULL;
-  }
-  virtual thunk::ResourceCreationAPI* AsResourceCreation() {
-    return NULL;
-  }
+  // Inheritance-based dynamic casting for this object. Returns the pointer to
+  // the given type if it's supported. Derived classes override these AsXXX
+  #define DEFINE_TYPE_GETTER(FUNCTIONS) \
+    virtual thunk::FUNCTIONS* As##FUNCTIONS();
+  FOR_ALL_PPAPI_FUNCTION_APIS(DEFINE_TYPE_GETTER)
+  #undef DEFINE_TYPE_GETTER
 
+  // Template-based dynamic casting. See specializations below.
   template <typename T> T* GetAs() { return NULL; }
 };
 
-template<>
-inline thunk::PPB_CharSet_FunctionAPI* FunctionGroupBase::GetAs() {
-  return AsCharSet_FunctionAPI();
-}
-template<>
-inline thunk::PPB_CursorControl_FunctionAPI* FunctionGroupBase::GetAs() {
-  return AsCursorControl_FunctionAPI();
-}
-template<>
-inline thunk::PPB_Font_FunctionAPI* FunctionGroupBase::GetAs() {
-  return AsFont_FunctionAPI();
-}
-template<>
-inline ppapi::thunk::ResourceCreationAPI* FunctionGroupBase::GetAs() {
-  return AsResourceCreation();
-}
+// Template-based dynamic casting. These specializatins forward to the
+// AsXXX virtual functions to return whether the given type is supported.
+#define DEFINE_FUNCTION_CAST(FUNCTIONS) \
+  template<> inline thunk::FUNCTIONS* FunctionGroupBase::GetAs() { \
+    return As##FUNCTIONS(); \
+  }
+FOR_ALL_PPAPI_FUNCTION_APIS(DEFINE_FUNCTION_CAST)
+#undef DEFINE_FUNCTION_CAST
 
 }  // namespace ppapi