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1 // Copyright 2015 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_PUBLIC_CPP_BINDINGS_INTERFACE_PTR_INFO_H_
6 #define MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_PTR_INFO_H_
7 
8 #include <cstddef>
9 #include <cstdint>
10 #include <utility>
11 
12 #include "base/macros.h"
13 #include "mojo/public/cpp/system/message_pipe.h"
14 
15 namespace mojo {
16 
17 // InterfacePtrInfo stores necessary information to communicate with a remote
18 // interface implementation, which could be used to construct an InterfacePtr.
19 template <typename Interface>
20 class InterfacePtrInfo {
21  public:
InterfacePtrInfo()22   InterfacePtrInfo() : version_(0u) {}
InterfacePtrInfo(std::nullptr_t)23   InterfacePtrInfo(std::nullptr_t) : InterfacePtrInfo() {}
24 
InterfacePtrInfo(ScopedMessagePipeHandle handle,uint32_t version)25   InterfacePtrInfo(ScopedMessagePipeHandle handle, uint32_t version)
26       : handle_(std::move(handle)), version_(version) {}
27 
InterfacePtrInfo(InterfacePtrInfo && other)28   InterfacePtrInfo(InterfacePtrInfo&& other)
29       : handle_(std::move(other.handle_)), version_(other.version_) {
30     other.version_ = 0u;
31   }
32 
~InterfacePtrInfo()33   ~InterfacePtrInfo() {}
34 
35   InterfacePtrInfo& operator=(InterfacePtrInfo&& other) {
36     if (this != &other) {
37       handle_ = std::move(other.handle_);
38       version_ = other.version_;
39       other.version_ = 0u;
40     }
41 
42     return *this;
43   }
44 
is_valid()45   bool is_valid() const { return handle_.is_valid(); }
46 
PassHandle()47   ScopedMessagePipeHandle PassHandle() { return std::move(handle_); }
handle()48   const ScopedMessagePipeHandle& handle() const { return handle_; }
set_handle(ScopedMessagePipeHandle handle)49   void set_handle(ScopedMessagePipeHandle handle) {
50     handle_ = std::move(handle);
51   }
52 
version()53   uint32_t version() const { return version_; }
set_version(uint32_t version)54   void set_version(uint32_t version) { version_ = version; }
55 
56   // Allow InterfacePtrInfo<> to be used in boolean expressions.
57   explicit operator bool() const { return handle_.is_valid(); }
58 
59  private:
60   ScopedMessagePipeHandle handle_;
61   uint32_t version_;
62 
63   DISALLOW_COPY_AND_ASSIGN(InterfacePtrInfo);
64 };
65 
66 }  // namespace mojo
67 
68 #endif  // MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_PTR_INFO_H_
69