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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_SHARED_IMPL_FUNCTION_GROUP_BASE_H_
#define PPAPI_SHARED_IMPL_FUNCTION_GROUP_BASE_H_
#include <stddef.h> // For NULL.
#include "ppapi/shared_impl/ppapi_shared_export.h"
#define FOR_ALL_PPAPI_FUNCTION_APIS(F) \
F(PPB_CharSet_FunctionAPI) \
F(PPB_CursorControl_FunctionAPI) \
F(PPB_Find_FunctionAPI) \
F(PPB_Font_FunctionAPI) \
F(PPB_Fullscreen_FunctionAPI) \
F(PPB_Instance_FunctionAPI) \
F(ResourceCreationAPI)
namespace ppapi {
// Forward declare all the function APIs.
namespace thunk {
#define DECLARE_FUNCTION_CLASS(FUNCTIONS) class FUNCTIONS;
FOR_ALL_PPAPI_FUNCTION_APIS(DECLARE_FUNCTION_CLASS)
#undef DECLARE_FUNCTION_CLASS
} // namespace thunk
class PPAPI_SHARED_EXPORT FunctionGroupBase {
public:
virtual ~FunctionGroupBase();
// Dynamic casting for this object. Returns the pointer to the given type if
// Inheritance-based dynamic casting for this object. Returns the pointer to
// the given type if it's supported. Derived classes override the functions
// they support to return the interface.
#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-based dynamic casting. These specializations 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
#endif // PPAPI_SHARED_IMPL_FUNCTION_GROUP_BASE_H_
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