+++ /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 <typeinfo>
-#include <cassert>
-
-
-// Local Includes: Application specific classes, functions, and libraries
-
-
-namespace asn{
-
-template<size_t S>
-struct variant
-{
- typedef variant<S> self_type;
-
- template <typename T>
- static void check_size () {static_assert(sizeof (T) <= S, "wrong type");}
-
- variant ()
- : typeinfo (nullptr)
- {}
-
- template <typename T>
- variant (const T& t)
- : typeinfo (&typeid (T))
- {
- check_size<T>();
- new (as_<T>()) T (t);
- }
-
- ~variant ()
- {
- assert(!typeinfo);
- }
-
- template <typename T>
- T& build ()
- {
- assert(!typeinfo);
- typeinfo = & typeid (T);
- return *new (as_<T>()) T;
- }
-
- template <typename T>
- T& build (const T& t)
- {
- assert(!typeinfo);
- check_size<T>();
- typeinfo = & typeid (T);
- return *new (as_<T> ()) T (t);
- }
-
- template <typename T>
- T& as()
- {
- assert(*typeinfo == typeid (T));
- check_size<T>();
- return *as_<T> ();
- }
-
- template <typename T>
- const T& as() const
- {
- assert(*typeinfo == typeid (T));
- check_size<T>();
- return *as_<T> ();
- }
-
- template <typename T>
- void swap(self_type& other)
- {
- assert (typeinfo);
- assert (*typeinfo == *other.typeinfo);
- std::swap (as<T> (), other.as<T> ());
- }
-
- template <typename T>
- void move(self_type& other)
- {
- build<T> ();
- swap<T> (other);
- other.destroy<T> ();
- }
-
- template <typename T>
- void copy(const self_type& other)
- {
- build<T> (other.as<T> ());
- }
-
- template <typename T>
- void destroy()
- {
- as<T> ().~T ();
- typeinfo = nullptr;
- }
-
-private:
- self_type& operator=(const self_type&){}
- variant (const self_type&){}
-
- template <typename T>
- T* as_()
- {
- void *p = buffer.raw;
- return static_cast<T*> (p);
- }
-
- template <typename T>
- const T* as_() const
- {
- const void *p = buffer.raw;
- return static_cast<const T*> (p);
- }
-
- union
- {
- long double align_me;
- char raw[S];
- } buffer;
-
- const std::type_info *typeinfo;
-};
-
-} //namspace asn