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diff --git a/thirdparty/oidn/mkl-dnn/src/common/primitive.hpp b/thirdparty/oidn/mkl-dnn/src/common/primitive.hpp
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+/*******************************************************************************
+* Copyright 2016-2018 Intel Corporation
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*******************************************************************************/
+
+#ifndef PRIMITIVE_HPP
+#define PRIMITIVE_HPP
+
+#include <assert.h>
+
+#include "mkldnn.h"
+
+#include "c_types_map.hpp"
+#include "nstl.hpp"
+#include "primitive_desc.hpp"
+#include "primitive_exec_types.hpp"
+
+/** \brief A pure virtual primitive class
+ *
+ * Primitive contains links to its inputs & outputs, though it does not track
+ * their readiness on execution step.
+ *
+ * @remark @b Rational.
+ *   Dependencies are essential through-out the whole MKL-DNN library, so it
+ *   makes sense to include them on the very low level. On the other hand,
+ *   tracking them should be a task for corresponding essence, like scheduler,
+ *   stream or whatever. Primitive itself should know nothing about the
+ *   environment it is running in.
+ *
+ * @note
+ *   To make user experience better we should provide API which allows
+ *   achieving the best (or good enough) performance when creating primitives
+ *   in natural order: i.e. from bottom to top for forward pass and from top to
+ *   bottom for backward pass. Please consider restriction [1] in Level 0.
+ */
+struct mkldnn_primitive: public mkldnn::impl::c_compatible {
+    mkldnn_primitive(const mkldnn::impl::primitive_desc_t *pd)
+        : pd_(pd->clone()) {}
+    virtual ~mkldnn_primitive() { delete pd_; }
+
+    /** returns primitive's engine */
+    mkldnn::impl::engine_t *engine() const { return pd_->engine(); }
+    /** returns primitive's inputs */
+    const mkldnn::impl::primitive_desc_t *pd() const { return pd_; }
+    /** returns primitive's kind */
+    mkldnn::impl::primitive_kind_t kind() const { return pd_->kind(); }
+
+    /** executes primitive with execution context @p ctx */
+    virtual mkldnn::impl::status_t execute(const mkldnn::impl::exec_ctx_t &ctx)
+        const = 0;
+
+protected:
+    const mkldnn::impl::primitive_desc_t *pd_;
+
+private:
+    mkldnn_primitive() = delete;
+    mkldnn_primitive(const mkldnn_primitive &) = delete;
+    mkldnn_primitive(mkldnn_primitive &&) = delete;
+    mkldnn_primitive &operator=(const mkldnn_primitive &) = delete;
+    mkldnn_primitive &operator=(mkldnn_primitive &&) = delete;
+};
+
+#endif
+
+// vim: et ts=4 sw=4 cindent cino^=l0,\:0,N-s