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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_ASSOCIATED_INTERFACE_PTR_INFO_H_
      6 #define MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_INTERFACE_PTR_INFO_H_
      7 
      8 #include <stdint.h>
      9 #include <utility>
     10 
     11 #include "base/macros.h"
     12 #include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
     13 
     14 namespace mojo {
     15 
     16 // AssociatedInterfacePtrInfo stores necessary information to construct an
     17 // associated interface pointer. It is similar to InterfacePtrInfo except that
     18 // it doesn't own a message pipe handle.
     19 template <typename Interface>
     20 class AssociatedInterfacePtrInfo {
     21  public:
     22   AssociatedInterfacePtrInfo() : version_(0u) {}
     23 
     24   AssociatedInterfacePtrInfo(AssociatedInterfacePtrInfo&& other)
     25       : handle_(std::move(other.handle_)), version_(other.version_) {
     26     other.version_ = 0u;
     27   }
     28 
     29   AssociatedInterfacePtrInfo(ScopedInterfaceEndpointHandle handle,
     30                              uint32_t version)
     31       : handle_(std::move(handle)), version_(version) {}
     32 
     33   ~AssociatedInterfacePtrInfo() {}
     34 
     35   AssociatedInterfacePtrInfo& operator=(AssociatedInterfacePtrInfo&& 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 
     45   bool is_valid() const { return handle_.is_valid(); }
     46 
     47   ScopedInterfaceEndpointHandle PassHandle() {
     48     return std::move(handle_);
     49   }
     50   const ScopedInterfaceEndpointHandle& handle() const { return handle_; }
     51   void set_handle(ScopedInterfaceEndpointHandle handle) {
     52     handle_ = std::move(handle);
     53   }
     54 
     55   uint32_t version() const { return version_; }
     56   void set_version(uint32_t version) { version_ = version; }
     57 
     58   bool Equals(const AssociatedInterfacePtrInfo& other) const {
     59     if (this == &other)
     60       return true;
     61 
     62     // Now that the two refer to different objects, they are equivalent if
     63     // and only if they are both invalid.
     64     return !is_valid() && !other.is_valid();
     65   }
     66 
     67  private:
     68   ScopedInterfaceEndpointHandle handle_;
     69   uint32_t version_;
     70 
     71   DISALLOW_COPY_AND_ASSIGN(AssociatedInterfacePtrInfo);
     72 };
     73 
     74 }  // namespace mojo
     75 
     76 #endif  // MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_INTERFACE_PTR_INFO_H_
     77