--- /dev/null
+#pragma once
+
+/******************************************************************************
+*
+* Copyright (c) 2019 AT&T Intellectual Property.
+* Copyright (c) 2018-2019 Nokia.
+*
+* 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.
+*
+******************************************************************************/
+
+// Standard Includes: ANSI C/C++, MSA, and Third-Party Libraries
+#include <new>
+#include <memory>
+
+// Local Includes: Application specific classes, functions, and libraries
+
+namespace asn
+{
+
+struct allocator
+{
+ allocator() = default;
+
+ allocator(void* data, size_t size) { reset(data, size); }
+
+ template <typename T, std::size_t SZ>
+ explicit allocator(T (&buf)[SZ]) : allocator(buf, SZ * sizeof(T)) { }
+
+ void reset(void* data, size_t size)
+ {
+ std::size_t space = size;
+ m_begin = static_cast<uint8_t*>(std::align(alignment, size, data, space));
+ m_end = m_begin ? m_begin + space : nullptr;
+ m_current = m_begin;
+ m_ref_counter = 0;
+ }
+
+ uint8_t* alloc_bytes(std::size_t size)
+ {
+ std::size_t const esize = (size + alignment - 1) & -alignment;
+ if (m_current + esize > m_end) { return nullptr; } //throw std::bad_alloc();
+
+ uint8_t* const rval = m_current;
+ m_current += esize;
+ return rval;
+ }
+
+ size_t add_ref() { return ++m_ref_counter; }
+ size_t release()
+ {
+ if (m_ref_counter) --m_ref_counter;
+ if (m_ref_counter == 0) reset();
+ return m_ref_counter;
+ }
+ size_t ref_counter() const { return m_ref_counter; }
+private:
+ //called by last release() when m_ref_counter becomes 0
+ void reset()
+ {
+ m_current = m_begin;
+ }
+
+
+ enum : std::size_t
+ {
+ alignment = alignof(std::size_t)
+ };
+
+ uint8_t* m_begin { nullptr }; //set in reset()
+ uint8_t* m_current { nullptr }; //changed by alloc_bytes
+ uint8_t* m_end { nullptr };
+
+ size_t m_ref_counter {0};
+};
+
+} //namespace asn
+