Line data    Source code

       1             : // Author(s): Wieger Wesselink
       2             : // Copyright: see the accompanying file COPYING or copy at
       3             : // https://github.com/mCRL2org/mCRL2/blob/master/COPYING
       4             : //
       5             : // Distributed under the Boost Software License, Version 1.0.
       6             : // (See accompanying file LICENSE_1_0.txt or copy at
       7             : // http://www.boost.org/LICENSE_1_0.txt)
       8             : //
       9             : /// \file mcrl2/data/default_expression_generator.h
      10             : /// \brief add your file description here.
      11             : 
      12             : #ifndef MCRL2_DATA_DEFAULT_EXPRESSION_GENERATOR_H
      13             : #define MCRL2_DATA_DEFAULT_EXPRESSION_GENERATOR_H
      14             : 
      15             : #include "mcrl2/data/representative_generator.h"
      16             : 
      17             : namespace mcrl2 {
      18             : 
      19             : namespace data {
      20             : 
      21             : /// \brief Expression generator that caches values.
      22             : class default_expression_generator
      23             : {
      24             :   protected:
      25             :     data::representative_generator generator;
      26             :     std::map<sort_expression, data_expression> default_values;
      27             : 
      28             :   public:
      29           0 :     explicit default_expression_generator(const data_specification& dataspec)
      30           0 :       : generator(dataspec)
      31           0 :     {}
      32             : 
      33           0 :     const data_expression& operator()(const sort_expression& x)
      34             :     {
      35           0 :       auto i = default_values.find(x);
      36           0 :       if (i == default_values.end())
      37             :       {
      38           0 :         data_expression d = generator(x);
      39           0 :         if (!d.defined())
      40             :         {
      41           0 :           throw mcrl2::runtime_error("could not find a default value for sort " + data::pp(x));
      42             :         }
      43           0 :         i = default_values.insert(std::make_pair(x, d)).first;
      44           0 :       }
      45           0 :       return i->second;
      46             :     }
      47             : };
      48             : 
      49             : } // namespace data
      50             : 
      51             : } // namespace mcrl2
      52             : 
      53             : #endif // MCRL2_DATA_DEFAULT_EXPRESSION_GENERATOR_H