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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   AssociatedInterfacePtrInfo(std::nullptr_t) : version_(0u) {}
     24 
     25   AssociatedInterfacePtrInfo(AssociatedInterfacePtrInfo&& other)
     26       : handle_(std::move(other.handle_)), version_(other.version_) {
     27     other.version_ = 0u;
     28   }
     29 
     30   AssociatedInterfacePtrInfo(ScopedInterfaceEndpointHandle handle,
     31                              uint32_t version)
     32       : handle_(std::move(handle)), version_(version) {}
     33 
     34   ~AssociatedInterfacePtrInfo() {}
     35 
     36   AssociatedInterfacePtrInfo& operator=(AssociatedInterfacePtrInfo&& other) {
     37     if (this != &other) {
     38       handle_ = std::move(other.handle_);
     39       version_ = other.version_;
     40       other.version_ = 0u;
     41     }
     42 
     43     return *this;
     44   }
     45 
     46   bool is_valid() const { return handle_.is_valid(); }
     47 
     48   ScopedInterfaceEndpointHandle PassHandle() {
     49     return std::move(handle_);
     50   }
     51   const ScopedInterfaceEndpointHandle& handle() const { return handle_; }
     52   void set_handle(ScopedInterfaceEndpointHandle handle) {
     53     handle_ = std::move(handle);
     54   }
     55 
     56   uint32_t version() const { return version_; }
     57   void set_version(uint32_t version) { version_ = version; }
     58 
     59   bool Equals(const AssociatedInterfacePtrInfo& other) const {
     60     if (this == &other)
     61       return true;
     62 
     63     // Now that the two refer to different objects, they are equivalent if
     64     // and only if they are both invalid.
     65     return !is_valid() && !other.is_valid();
     66   }
     67 
     68  private:
     69   ScopedInterfaceEndpointHandle handle_;
     70   uint32_t version_;
     71 
     72   DISALLOW_COPY_AND_ASSIGN(AssociatedInterfacePtrInfo);
     73 };
     74 
     75 }  // namespace mojo
     76 
     77 #endif  // MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_INTERFACE_PTR_INFO_H_
     78