no_substitution.h

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// Author(s): Wieger Wesselink
// Copyright: see the accompanying file COPYING or copy at
// https://github.com/mCRL2org/mCRL2/blob/master/COPYING
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
 
#ifndef MCRL2_DATA_SUBSTITUTIONS_NO_SUBSTITUTION_H
#define MCRL2_DATA_SUBSTITUTIONS_NO_SUBSTITUTION_H
 
#include <iostream>
 
namespace mcrl2 {
 
namespace data {
 
struct no_substitution
{
};
 
inline
std::ostream& operator<<(std::ostream& out, const no_substitution&)
{
  return out << "[]";
}
 
} // namespace data
 
} // namespace mcrl2
 
#endif // MCRL2_DATA_SUBSTITUTIONS_NO_SUBSTITUTION_H