WebView2 added as embedded browser

extern/include/wil/cppwinrt_register_com_server.h

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+//*********************************************************
+//
+//    Copyright (c) Microsoft. All rights reserved.
+//    This code is licensed under the MIT License.
+//    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+//    ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+//    TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+//    PARTICULAR PURPOSE AND NONINFRINGEMENT.
+//
+//*********************************************************
+//! @file
+//! Utilities for making managing COM server easier
+
+#ifndef __WIL_CPPWINRT_REGISTER_COM_SERVER_INCLUDED
+#define __WIL_CPPWINRT_REGISTER_COM_SERVER_INCLUDED
+
+#include <winrt/base.h>
+#include <wil/resource.h>
+#include <wil/cppwinrt.h>
+#include <vector>
+
+namespace wil::details
+{
+template <typename T>
+struct CppWinRTClassFactory : winrt::implements<CppWinRTClassFactory<T>, IClassFactory, winrt::no_module_lock>
+{
+    HRESULT __stdcall CreateInstance(IUnknown* outer, GUID const& iid, void** result) noexcept final
+    try
+    {
+        *result = nullptr;
+
+        if (outer)
+        {
+            return CLASS_E_NOAGGREGATION;
+        }
+        return winrt::make_self<T>().as(iid, result);
+    }
+    CATCH_RETURN()
+
+    HRESULT __stdcall LockServer(BOOL) noexcept final
+    {
+        return S_OK;
+    }
+};
+
+template <typename T = void, typename... Rest>
+void register_com_server(std::vector<wil::unique_com_class_object_cookie>& registrations)
+{
+    DWORD registration{};
+    winrt::check_hresult(CoRegisterClassObject(
+        winrt::guid_of<T>(), winrt::make<CppWinRTClassFactory<T>>().get(), CLSCTX_LOCAL_SERVER, REGCLS_MULTIPLEUSE, &registration));
+    // This emplace_back is no-throw as wil::register_com_server already reserves enough capacity
+    registrations.emplace_back(registration);
+    register_com_server<Rest...>(registrations);
+}
+
+template <>
+void register_com_server<void>(std::vector<unique_com_class_object_cookie>&)
+{
+}
+} // namespace wil::details
+
+namespace wil
+{
+template <typename T, typename... Rest>
+[[nodiscard]] std::vector<wil::unique_com_class_object_cookie> register_com_server()
+{
+    std::vector<wil::unique_com_class_object_cookie> registrations;
+    registrations.reserve(sizeof...(Rest) + 1);
+    details::register_com_server<T, Rest...>(registrations);
+    // C++17 doesn't provide guaranteed copy elision, but the copy should be elided nonetheless.
+    return registrations;
+}
+} // namespace wil
+
+#endif