1 // This file is part of CAF, the C++ Actor Framework. See the file LICENSE in
2 // the main distribution directory for license terms and copyright or visit
3 // https://github.com/actor-framework/actor-framework/blob/master/LICENSE.
4 
5 #pragma once
6 
7 #include <type_traits>
8 
9 namespace caf {
10 
11 template <class T, int Pos>
12 struct sum_type_token {};
13 
14 template <class T, int Pos>
pos(sum_type_token<T,Pos>)15 constexpr std::integral_constant<int, Pos> pos(sum_type_token<T, Pos>) {
16   return {};
17 }
18 
19 } // namespace caf
20