mutable_substitution_composer.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_MUTABLE_SUBSTITUTION_COMPOSER_H
#define MCRL2_DATA_SUBSTITUTIONS_MUTABLE_SUBSTITUTION_COMPOSER_H
 
#include "mcrl2/data/replace.h"
#include "mcrl2/data/substitutions/mutable_indexed_substitution.h"
#include "mcrl2/data/substitutions/mutable_map_substitution.h"
 
namespace mcrl2 {
 
namespace data {
 
template <typename Substitution>
class mutable_substitution_composer
{
  public:
    using variable_type = typename Substitution::variable_type ;
 
    using expression_type = typename Substitution::expression_type;
 
    using assignment = typename mutable_map_substitution<std::map<variable_type, expression_type> >::assignment ;
 
    using substitution_type = Substitution;
 
    using argument_type = variable_type;
    using result_type = expression_type;
 
  protected:
    const Substitution& f_;
 
    mutable_map_substitution<std::map<variable_type, expression_type> > g_;
 
  public:
    mutable_substitution_composer(const Substitution& f)
      : f_(f)
    {}
 
    expression_type operator()(variable_type const& v) const
    {
      return data::replace_free_variables(f_(v), g_);
    }
 
    assignment operator[](variable_type const& v)
    {
      return g_[v];
    }
 
    const substitution_type& substitution() const
    {
      return f_;
    }
};
 
template <typename AssociativeContainer>
class mutable_substitution_composer<mutable_map_substitution<AssociativeContainer>>
{
  public:
    using substitution_type = mutable_map_substitution<AssociativeContainer>;
 
    using variable_type = typename substitution_type::variable_type;
 
    using expression_type = typename substitution_type::expression_type;
 
    using assignment = typename substitution_type::assignment;
    
    using argument_type = variable_type;
    using result_type = expression_type;
 
  protected:
    substitution_type& g_;
 
  public:
 
    mutable_substitution_composer(mutable_map_substitution<AssociativeContainer>& g)
      : g_(g)
    {}
 
    const expression_type operator()(variable_type const& v) const
    {
      return g_(v);
    }
 
    assignment operator[](variable_type const& v)
    {
      return g_[v];
    }
 
    const substitution_type& substitution() const
    {
      return g_;
    }
};
 
template <typename VariableType, typename ExpressionSequence>
class mutable_substitution_composer<mutable_indexed_substitution<VariableType, ExpressionSequence>>
{
  public:
    using substitution_type = mutable_indexed_substitution<VariableType, ExpressionSequence>;
 
    using variable_type = typename substitution_type::variable_type;
 
    using expression_type = typename substitution_type::expression_type;
 
    using assignment = typename substitution_type::assignment;
 
    using argument_type = variable_type;
    using result_type = expression_type;
 
  protected:
    substitution_type& g_;
 
  public:
 
    mutable_substitution_composer(substitution_type& g)
      : g_(g)
    {}
 
    const expression_type operator()(variable_type const& v) const
    {
      return g_(v);
    }
 
    assignment operator[](variable_type const& v)
    {
      return g_[v];
    }
 
    const substitution_type& substitution() const
    {
      return g_;
    }
};
 
} // namespace data
 
} // namespace mcrl2
 
#endif // MCRL2_DATA_SUBSTITUTIONS_MUTABLE_SUBSTITUTION_COMPOSER_H