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ILifetimeWatcher.h (1664B)

      1 // Copyright (c) Microsoft Corporation.
      2 // Licensed under the MIT License.
      3 #pragma once
      4 #include <Unknwn.h>
      5 #include <winrt/Windows.Foundation.h>
      6 
      7 namespace AppInstaller::WinRT
      8 {
      9     MIDL_INTERFACE("59b5623f-d03e-41f8-b400-89ee04ea02d7")
     10     ILifetimeWatcher : public IUnknown
     11     {
     12     public:
     13         // Due to the way the winrt types are set up, this watcher will not have AddRef called.
     14         virtual /* [local] */ HRESULT STDMETHODCALLTYPE SetLifetimeWatcher(
     15             IUnknown* watcher) = 0;
     16     };
     17 
     18     // Implements ILifetimeWatcher functionality.
     19     struct LifetimeWatcherBase
     20     {
     21         HRESULT STDMETHODCALLTYPE SetLifetimeWatcher(IUnknown* watcher)
     22         {
     23             m_lifetimeWatcher = winrt::Windows::Foundation::IUnknown(watcher, winrt::take_ownership_from_abi);
     24             return S_OK;
     25         }
     26 
     27         void PropagateLifetimeWatcher(const winrt::Windows::Foundation::IUnknown& child)
     28         {
     29             if (m_lifetimeWatcher && child)
     30             {
     31                 // Require that any call to this function is for an object that implements watching to prevent
     32                 // accidental assumptions about the child object and lifetime management.
     33                 auto watcher = child.as<ILifetimeWatcher>();
     34 
     35                 // Create a copy of the lifetime watcher (to add_ref), then detach and pass it to the child to own.
     36                 watcher->SetLifetimeWatcher(static_cast<IUnknown*>(winrt::detach_abi(winrt::Windows::Foundation::IUnknown{ m_lifetimeWatcher })));
     37             }
     38         }
     39 
     40     private:
     41         winrt::Windows::Foundation::IUnknown m_lifetimeWatcher;
     42     };
     43 }