value.hh

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// This file is part of Awali.
// Copyright 2016-2022 Sylvain Lombardy, Victor Marsault, Jacques Sakarovitch
//
// Awali is a free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
 
#ifndef AWAlI_DYN_OPTIONS_VALUE_HH
#define AWAlI_DYN_OPTIONS_VALUE_HH
 
 
namespace awali {
  namespace dyn {
    namespace internal {
 
      struct opt_untyped_value {
        opt_untyped_value() {}
        virtual opt_untyped_value* clone() const = 0;
        virtual ~opt_untyped_value() {}
      };
 
      template<typename T>
      struct opt_typed_value : opt_untyped_value {
        T value;
 
        opt_typed_value(const T& val) : value(val) {}
 
        opt_typed_value* clone() const override {
          return new opt_typed_value(value);
        }
      };
 
 
      struct opt_any_t {
       private:
        opt_untyped_value* value;
 
       public:
 
        template<typename T>
        opt_any_t(const T& val) : value(new opt_typed_value<T>(val)) {}
 
        opt_any_t(char const* s) : value(new opt_typed_value<std::string>(s)) {}
 
        opt_any_t(opt_any_t const& a) : value(a.value->clone()) {}
 
        opt_any_t& operator= (opt_any_t const& t) {
          if(&t!=this) {
            delete value;
            value=t.value->clone();
          }
          return (*this);
        }
 
        ~opt_any_t() {
          delete(value);
        }
 
 
        template<typename T>
        explicit
        operator T() const {
          const opt_typed_value<T>& test
            = dynamic_cast<const opt_typed_value<T>&>(*(this->value));
          return test.value;
        }
 
      };
 
      struct option_value_pair_t {
        size_t id;
        internal::opt_any_t value;
        option_value_pair_t(size_t i, internal::opt_any_t v) : id(i), value(v) {}
      };
 
    }
  }
} //end of namespaces awali::dyn::internal, awali::dyn, and awali.
#endif