[wip] apply interface

examples/batched-matrix-free-templated/batched/backend/batch_user_operator.hpp

@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: 2025 The Ginkgo authors
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+#pragma once
+
+#include <ginkgo/core/base/batch_lin_op.hpp>
+
+
+namespace gko::batch_template {
+
+template <typename Concrete>
+class EnableBatchUserLinOp : public batch::BatchLinOp {
+public:
+    using value_type = typename Concrete::value_type;
+
+    void apply(ptr_param<const batch::MultiVector<value_type>> b,
+               ptr_param<batch::MultiVector<value_type>> x) const
+    {
+        this->validate_application_parameters(b.get(), x.get());
+        auto exec = self()->get_executor();
+        this->template log<log::Logger::batch_solver_completed>(
+            log_data_->iter_counts, log_data_->res_norms);
+    }
+
+private:
+    GKO_ENABLE_SELF(Concrete);
+};
+
+}  // namespace gko::batch_template