ppapi/shared_impl/scoped_pp_var.h

   1 // Copyright (c) 2012 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 PPAPI_SHARED_IMPL_SCOPED_PP_VAR_H_
   6 #define PPAPI_SHARED_IMPL_SCOPED_PP_VAR_H_
   7
   8 #include "ppapi/c/pp_var.h"
   9 #include "ppapi/shared_impl/ppapi_shared_export.h"
  10
  11 namespace ppapi {
  12
  13 class PPAPI_SHARED_EXPORT ScopedPPVar {
  14  public:
  15   struct PassRef {};
  16
  17   ScopedPPVar();
  18
  19   // Takes one reference to the given var.
  20   explicit ScopedPPVar(const PP_Var& v);
  21
  22   // Assumes responsibility for one ref that the var already has.
  23   ScopedPPVar(const PassRef&, const PP_Var& v);
  24
  25   // Implicit copy constructor allowed.
  26   ScopedPPVar(const ScopedPPVar& other);
  27
  28   ~ScopedPPVar();
  29
  30   ScopedPPVar& operator=(const PP_Var& r);
  31   ScopedPPVar& operator=(const ScopedPPVar& other) {
  32     return operator=(other.var_);
  33   }
  34
  35   const PP_Var& get() const { return var_; }
  36
  37   // Returns the PP_Var, passing the reference to the caller. This class
  38   // will no longer hold the var.
  39   PP_Var Release();
  40
  41  private:
  42   PP_Var var_;
  43 };
  44
  45 }  // namespace ppapi
  46
  47 #endif  // PPAPI_SHARED_IMPL_SCOPED_PP_VAR_H_