Function CheckAndInstallARCoreAsync

Dependencies/xr/Source/ARCore/XR.cpp:241–274

        }

        arcana::task<void, std::exception_ptr> CheckAndInstallARCoreAsync()
        {
            auto task = arcana::task_from_result<std::exception_ptr>();

            // Check if ARCore is already installed.
            if (!CheckARCoreInstallStatus(false))
            {
                arcana::task_completion_source<void, std::exception_ptr> installTcs{};

                // Add a resume callback, which will check if ARCore has been successfully installed upon app resume.
                auto resumeTicket{AddResumeCallback([installTcs]() mutable {
                    if (!CheckARCoreInstallStatus(false))
                    {
                        // ARCore not installed, throw an error.
                        std::ostringstream message;
                        message << "ARCore not installed.";
                        installTcs.complete(arcana::make_unexpected(make_exception_ptr(std::runtime_error{message.str()})));
                    }
                    else
                    {
                        // ARCore installed successfully, complete the promise.
                        installTcs.complete();
                    }
                })};

                // Kick off the install request, and set the task for our caller to wait on.
                CheckARCoreInstallStatus(true);
                task = installTcs.as_task().then(arcana::inline_scheduler, arcana::cancellation::none(), [resumeTicket = std::move(resumeTicket)](){
                    return;
                });
            }

            return task;
        }

        arcana::task<void, std::exception_ptr> CheckCameraPermissionAsync()
        {