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diff --git a/jaucpp/include/jau/basic_algos.hpp b/jaucpp/include/jau/basic_algos.hpp
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+/*
+ * Author: Sven Gothel <[email protected]>
+ * Copyright (c) 2020 Gothel Software e.K.
+ * Copyright (c) 2020 ZAFENA AB
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * 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. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef JAU_BASIC_ALGOS_HPP_
+#define JAU_BASIC_ALGOS_HPP_
+
+#include <mutex>
+
+namespace jau {
+
+    /**
+     * Custom for_each template, using indices instead of iterators,
+     * allowing container to be modified within lambda 'callback'.
+     * <p>
+     * Method performs UnaryFunction on all elements [0..n-1],
+     * where n is being retrieved once before the loop!
+     * </p>
+     */
+    template<class InputArray, class UnaryFunction>
+    constexpr UnaryFunction for_each_idx(InputArray &array, UnaryFunction f)
+    {
+        const size_t size = array.size();
+        for (size_t i = 0; i < size; i++) {
+            f(array[i]);
+        }
+        return f; // implicit move since C++11
+    }
+
+    /**
+     * Custom for_each template, using indices instead of iterators,
+     * allowing container to be modified within lambda 'callback'.
+     * <p>
+     * Method performs UnaryFunction on all elements [0..n-1],
+     * where n is being retrieved once before the loop!
+     * </p>
+     * <p>
+     * This method also utilizes a given mutex to ensure thread-safety,
+     * by operating within an RAII-style std::lock_guard block.
+     * </p>
+     */
+    template<class Mutex, class InputArray, class UnaryFunction>
+    constexpr UnaryFunction for_each_idx_mtx(Mutex &mtx, InputArray &array, UnaryFunction f)
+    {
+        const std::lock_guard<Mutex> lock(mtx); // RAII-style acquire and relinquish via destructor
+
+        const size_t size = array.size();
+        for (size_t i = 0; i < size; i++) {
+            f(array[i]);
+        }
+        return f; // implicit move since C++11
+    }
+
+
+} // namespace jau
+
+#endif /* JAU_BASIC_ALGOS_HPP_ */