diff --git a/include/utl/container/id.h b/include/utl/container/id.h
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+/*!
+ * \file utl/container/id.h
+ * \brief A container for device ID's
+ *
+ * Copyright (C) 2018 Christos Choutouridis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see .
+ *
+ */
+
+#ifndef __utl_container_id_h__
+#define __utl_container_id_h__
+
+#include
+#include
+#include
+
+namespace utl {
+
+ /*!
+ * \ingroup containers
+ * \brief
+ * id container traits helper
+ */
+ //! @{
+ template
+ struct id_traits {
+ typedef _Tp type[_Nm];
+
+ static constexpr _Tp& Ref (const type& t, size_t n) noexcept {
+ return const_cast<_Tp&> (t[n]);
+ }
+
+ static constexpr _Tp* Ptr(const type& t) noexcept {
+ return const_cast<_Tp*> (t);
+ }
+ };
+
+ template
+ struct id_traits<_Tp, 0> {
+ struct type { };
+
+ static constexpr _Tp& Ref(const type& t, size_t n) noexcept {
+ return *static_cast<_Tp*>(nullptr);
+ }
+
+ static constexpr _Tp* Ptr(const type& t) noexcept {
+ return nullptr;
+ }
+ };
+ //! @{
+
+ /*!
+ * \ingroup containers
+ * \brief
+ * A standard container for storing IDs as a fixed size
+ * sequence of bytes. This type is based on etl::array
+ * Meets the requirements of:
+ * container,
+ * reversible container,
+ * sequence.
+ * Sets support random access iterators.
+ * \tparam _Tp The base type
+ * \tparam _Nm Number of bytes.
+ */
+ template
+ struct id_t {
+ using value_type = _Tp;
+ using pointer = value_type*;
+ using const_pointer = const value_type*;
+ using reference = value_type&;
+ using const_reference = const value_type&;
+ using iterator = value_type*;
+ using const_iterator = const value_type*;
+ using size_type = size_t;
+ using difference_type = std::ptrdiff_t;
+ using reverse_iterator = std::reverse_iterator ;
+ using const_reverse_iterator
+ = std::reverse_iterator ;
+
+ // type and data
+ using traits_t = id_traits<_Tp, _Nm>;
+ typename traits_t::type _data;
+
+ // No explicit construct/copy/destroy for aggregate type.
+
+ // DR 776 (std::array)
+ void fill (const value_type& v) { std::fill_n (begin(), size(), v); }
+
+ void swap (id_t& other) noexcept {
+ std::swap_ranges (begin(), end(), other.begin());
+ }
+
+ //! \name Iterators.
+ //!@{
+ iterator begin() noexcept { return iterator (data()); }
+ const_iterator begin() const noexcept { return const_iterator (data()); }
+ iterator end() noexcept { return iterator (data() + _Nm); }
+ const_iterator end() const noexcept { return const_iterator (data() + _Nm); }
+ const_iterator cbegin() const noexcept { return const_iterator (data()); }
+ const_iterator cend() const noexcept { return const_iterator (data() + _Nm); }
+
+ reverse_iterator rbegin() noexcept { return reverse_iterator (end()); }
+ reverse_iterator rend() noexcept { return reverse_iterator (begin()); }
+ const_reverse_iterator rbegin() const noexcept { return const_reverse_iterator (end()); }
+ const_reverse_iterator rend() const noexcept { return const_reverse_iterator (begin()); }
+ const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator (end()); }
+ const_reverse_iterator crend() const noexcept { return const_reverse_iterator (begin()); }
+ //!@{
+ //! \name Capacity.
+ //!@{
+ constexpr size_type size() const noexcept { return _Nm; }
+ constexpr size_type max_size() const noexcept { return _Nm; }
+ constexpr bool empty() const noexcept { return size() == 0; }
+ //!@{
+
+ //! \name Element access.
+ //!@{
+
+ //! Operator []
+ reference operator[] (size_type n) noexcept {
+ return traits_t::Ref (_data, n);
+ }
+ //! Operator [] for const
+ constexpr const_reference operator[] (size_type n) const noexcept {
+ return traits_t::Ref (_data, n);
+ }
+
+ /*!
+ * Boundary check dereference operator.
+ * If out of bounds, abort (for now).
+ */
+ reference at (size_type n) noexcept {
+ if (n < _Nm)
+ return traits_t::Ref (_data, n);
+ else
+ abort ();
+ }
+ //! Compile time boundary check dereference operator.
+ constexpr const_reference at (size_type n) const noexcept {
+ static_assert ((n < _Nm), "id_t::at: out of range");
+ return traits_t::Ref (_data, n);
+ }
+ /*!
+ * Read a bit position from a id
+ * \param bit The bit location we want to read
+ */
+ constexpr bool bit (uint8_t bit) const noexcept {
+ value_type one = 1;
+ uint8_t den = 8*sizeof(_Tp)/sizeof(uint8_t);
+ return traits_t::Ref (_data, bit/den) & (one << ((bit % den)-1));
+ }
+
+ /*!
+ * Write/modify a bit position from a id
+ * \param bit The bit location we want to set
+ * \param v The value we want to set
+ */
+ void bit (uint8_t bit, bool v) noexcept {
+ value_type one = 1;
+ uint8_t den = 8*sizeof(_Tp)/sizeof(uint8_t);
+ if (v) traits_t::Ref (_data, bit/den) |= one << ((bit % den)-1);
+ else traits_t::Ref (_data, bit/den) &= ~one << ((bit % den)-1);
+ }
+ // first item
+ reference front () noexcept {
+ return *begin ();
+ }
+ constexpr const_reference front () const noexcept {
+ return traits_t::Ref (_data, 0);
+ }
+
+ // Last item
+ reference back () noexcept {
+ return _Nm ? *(end() - 1) : *end();
+ }
+ constexpr const_reference back () const noexcept {
+ return _Nm ? traits_t::Ref (_data, _Nm - 1)
+ : traits_t::Ref (_data, 0);
+ }
+
+ // Pointer to data
+ pointer data () noexcept { return traits_t::Ptr (_data); }
+ const_pointer data () const noexcept { return traits_t::Ptr (_data); }
+ //!<@}
+ };
+
+ //! \name device ID comparisons.
+ //!@{
+ template
+ inline bool operator== (const id_t<_Tp, _Nm>& lhs, const id_t<_Tp, _Nm>& rhs) {
+ return std::equal (lhs.begin(), lhs.end(), rhs.begin());
+ }
+
+ template
+ inline bool operator!= (const id_t<_Tp, _Nm>& lhs, const id_t<_Tp, _Nm>& rhs) {
+ return !(lhs == rhs);
+ }
+
+ template
+ inline bool operator< (const id_t<_Tp, _Nm>& lhs, const id_t<_Tp, _Nm>& rhs) {
+ // MSB plays bigger role in comparison
+ return std::lexicographical_compare(lhs.rbegin(), lhs.rend(), rhs.rbegin(), rhs.rend());
+ }
+
+ template
+ inline bool operator> (const id_t<_Tp, _Nm>& lhs, const id_t<_Tp, _Nm>& rhs) {
+ return rhs < lhs;
+ }
+
+ template
+ inline bool operator<= (const id_t<_Tp, _Nm>& lhs, const id_t<_Tp, _Nm>& rhs) {
+ return !(lhs > rhs);
+ }
+
+ template
+ inline bool operator>= (const id_t<_Tp, _Nm>& lhs, const id_t<_Tp, _Nm>& rhs) {
+ return !(lhs < rhs);
+ }
+ //!@}
+
+} // namespace utl
+
+
+#endif /* __utl_container_id_h__ */