mojo/embedder/scoped_platform_handle.h

   1 // Copyright 2014 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 MOJO_EMBEDDER_SCOPED_PLATFORM_HANDLE_H_
   6 #define MOJO_EMBEDDER_SCOPED_PLATFORM_HANDLE_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/move.h"
  10 #include "mojo/embedder/platform_handle.h"
  11 #include "mojo/system/system_impl_export.h"
  12
  13 namespace mojo {
  14 namespace embedder {
  15
  16 class MOJO_SYSTEM_IMPL_EXPORT ScopedPlatformHandle {
  17   MOVE_ONLY_TYPE_FOR_CPP_03(ScopedPlatformHandle, RValue)
  18
  19  public:
  20   ScopedPlatformHandle() {}
  21   explicit ScopedPlatformHandle(PlatformHandle handle) : handle_(handle) {}
  22   ~ScopedPlatformHandle() { handle_.CloseIfNecessary(); }
  23
  24   // Move-only constructor and operator=.
  25   ScopedPlatformHandle(RValue other) : handle_(other.object->release()) {}
  26   ScopedPlatformHandle& operator=(RValue other) {
  27     handle_ = other.object->release();
  28     return *this;
  29   }
  30
  31   const PlatformHandle& get() const { return handle_; }
  32
  33   void swap(ScopedPlatformHandle& other) {
  34     PlatformHandle temp = handle_;
  35     handle_ = other.handle_;
  36     other.handle_ = temp;
  37   }
  38
  39   PlatformHandle release() WARN_UNUSED_RESULT {
  40     PlatformHandle rv = handle_;
  41     handle_ = PlatformHandle();
  42     return rv;
  43   }
  44
  45   void reset(PlatformHandle handle = PlatformHandle()) {
  46     handle_.CloseIfNecessary();
  47     handle_ = handle;
  48   }
  49
  50   bool is_valid() const {
  51     return handle_.is_valid();
  52   }
  53
  54  private:
  55   PlatformHandle handle_;
  56 };
  57
  58 }  // namespace embedder
  59 }  // namespace mojo
  60
  61 #endif  // MOJO_EMBEDDER_SCOPED_PLATFORM_HANDLE_H_