trying out distortos

1 files changed, 83 insertions, 0 deletions

diff --git a/include/estd/ReverseAdaptor.hpp b/include/estd/ReverseAdaptor.hpp
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+/**
+ * \file
+ * \brief ReverseAdaptor template class header.
+ *
+ * \author Copyright (C) 2014-2015 Kamil Szczygiel http://www.distortec.com http://www.freddiechopin.info
+ *
+ * \par License
+ * This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not
+ * distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef ESTD_REVERSEADAPTOR_HPP_
+#define ESTD_REVERSEADAPTOR_HPP_
+
+namespace estd
+{
+
+/**
+ * \brief ReverseAdaptor template class is an adaptor that "reverses" access to the container
+ *
+ * \tparam T is the type of container
+ */
+
+template<typename T>
+class ReverseAdaptor
+{
+public:
+
+	/**
+	 * \brief ReverseAdaptor's constructor.
+	 *
+	 * \param [in] container is a reference to container
+	 */
+
+	constexpr explicit ReverseAdaptor(T& container) noexcept :
+			container_{container}
+	{
+
+	}
+
+	/**
+	 * \return reverse_iterator to the beginning of "reversed" container (last element of original container)
+	 */
+
+	typename T::reverse_iterator begin() const noexcept
+	{
+		return container_.rbegin();
+	}
+
+	/**
+	 * \return reverse_iterator to the end of "reversed" container (before-the-first element of original container)
+	 */
+
+	typename T::reverse_iterator end() const noexcept
+	{
+		return container_.rend();
+	}
+
+private:
+
+	/// reference to container
+	T& container_;
+};
+
+/**
+ * \brief Helper factory function to make ReverseAdaptor object with deduced template arguments
+ *
+ * \tparam T is the type of container
+ *
+ * \param [in] container is a reference to container
+ *
+ * \return ReverseAdaptor object
+ */
+
+template<typename T>
+ReverseAdaptor<T> makeReverseAdaptor(T& container)
+{
+	return ReverseAdaptor<T>{container};
+}
+
+}	// namespace estd
+
+#endif	// ESTD_REVERSEADAPTOR_HPP_