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_EDK_EMBEDDER_SCOPED_PLATFORM_HANDLE_H_ 6 #define MOJO_EDK_EMBEDDER_SCOPED_PLATFORM_HANDLE_H_ 7 8 #include "base/compiler_specific.h" 9 #include "base/macros.h" 10 #include "mojo/edk/embedder/platform_handle.h" 11 #include "mojo/edk/system/system_impl_export.h" 12 #include "mojo/public/c/system/macros.h" 13 14 namespace mojo { 15 namespace edk { 16 17 class MOJO_SYSTEM_IMPL_EXPORT ScopedPlatformHandle { 18 public: ScopedPlatformHandle()19 ScopedPlatformHandle() {} ScopedPlatformHandle(PlatformHandle handle)20 explicit ScopedPlatformHandle(PlatformHandle handle) : handle_(handle) {} ~ScopedPlatformHandle()21 ~ScopedPlatformHandle() { handle_.CloseIfNecessary(); } 22 23 // Move-only constructor and operator=. ScopedPlatformHandle(ScopedPlatformHandle && other)24 ScopedPlatformHandle(ScopedPlatformHandle&& other) 25 : handle_(other.release()) {} 26 27 ScopedPlatformHandle& operator=(ScopedPlatformHandle&& other) { 28 if (this != &other) 29 handle_ = other.release(); 30 return *this; 31 } 32 get()33 const PlatformHandle& get() const { return handle_; } 34 swap(ScopedPlatformHandle & other)35 void swap(ScopedPlatformHandle& other) { 36 PlatformHandle temp = handle_; 37 handle_ = other.handle_; 38 other.handle_ = temp; 39 } 40 release()41 PlatformHandle release() WARN_UNUSED_RESULT { 42 PlatformHandle rv = handle_; 43 handle_ = PlatformHandle(); 44 return rv; 45 } 46 47 void reset(PlatformHandle handle = PlatformHandle()) { 48 handle_.CloseIfNecessary(); 49 handle_ = handle; 50 } 51 is_valid()52 bool is_valid() const { return handle_.is_valid(); } 53 54 private: 55 PlatformHandle handle_; 56 57 DISALLOW_COPY_AND_ASSIGN(ScopedPlatformHandle); 58 }; 59 60 } // namespace edk 61 } // namespace mojo 62 63 #endif // MOJO_EDK_EMBEDDER_SCOPED_PLATFORM_HANDLE_H_ 64