native_client_sdk/src/libraries/nacl_io/pepper_interface_dummy.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef LIBRARIES_NACL_IO_PEPPER_INTERFACE_DUMMY_H_
   6 #define LIBRARIES_NACL_IO_PEPPER_INTERFACE_DUMMY_H_
   7
   8 #include "nacl_io/pepper_interface.h"
   9
  10 // This class simplifies implementing a PepperInterface-derived class where you
  11 // don't care about certain interfaces. All interface-getters return NULL by
  12 // default.
  13 //
  14 // For example:
  15 //
  16 // class FooPepperInterface : public PepperInterfaceDummy {
  17 //  public:
  18 //   CoreInterface* GetCoreInterface() { ... };
  19 // };
  20 //
  21 // // FooPepperInterface is not abstract -- all pure virtual functions have
  22 // been defined to return NULL.
  23
  24 namespace nacl_io {
  25
  26 class PepperInterfaceDummy : public PepperInterface {
  27  public:
  28   PepperInterfaceDummy() {}
  29   virtual ~PepperInterfaceDummy() {}
  30   virtual PP_Instance GetInstance() { return 0; }
  31
  32 // Interface getters.
  33 #include "nacl_io/pepper/undef_macros.h"
  34 #include "nacl_io/pepper/define_empty_macros.h"
  35 #undef BEGIN_INTERFACE
  36 #define BEGIN_INTERFACE(BaseClass, PPInterface, InterfaceString) \
  37   virtual BaseClass* Get##BaseClass() { return NULL; }
  38 #include "nacl_io/pepper/all_interfaces.h"
  39 };
  40
  41 }  // namespace nacl_io
  42
  43 #endif  // LIBRARIES_NACL_IO_PEPPER_INTERFACE_DUMMY_H_