BuiltinVariant.h

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/******************************************************************************
 * Copyright (C) 2014 by Ralf Kaestner                                        *
 * ralf.kaestner@gmail.com                                                    *
 *                                                                            *
 * This program is free software; you can redistribute it and/or modify       *
 * it under the terms of the Lesser 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               *
 * Lesser GNU General Public License for more details.                        *
 *                                                                            *
 * You should have received a copy of the Lesser GNU General Public License   *
 * along with this program. If not, see <http://www.gnu.org/licenses/>.       *
 ******************************************************************************/

#ifndef VARIANT_TOPIC_TOOLS_BUILTIN_VARIANT_H
#define VARIANT_TOPIC_TOOLS_BUILTIN_VARIANT_H

#include <boost/type_traits.hpp>

#include <variant_topic_tools/BuiltinTypeTraits.h>
#include <variant_topic_tools/Pointer.h>
#include <variant_topic_tools/Variant.h>

namespace variant_topic_tools {
  class BuiltinVariant :
    public Variant {
  friend class BuiltinDataType;
  friend class Variant;
  public:
    BuiltinVariant();
    
    BuiltinVariant(const BuiltinVariant& src);
    
    BuiltinVariant(const Variant& src);
    
    ~BuiltinVariant();

    double getNumericValue() const;
      
    using Variant::operator=;
    
  protected:
    class Value :
      public virtual Variant::Value {
    public:
      Value();
      
      virtual ~Value();
      
      virtual double getNumericValue() const = 0;
    };
    
    template <typename T> class ValueImplT :
      public Variant::ValueT<typename type_traits::BuiltinType<T>::ValueType>,
      public Value {
    public:
      BOOST_STATIC_ASSERT(type_traits::IsBuiltin<T>::value);
      
      typedef typename type_traits::BuiltinType<T>::ValueType ValueType;
      
      ValueImplT(const Pointer<ValueType>& value = Pointer<ValueType>());
      
      ValueImplT(const ValueImplT<T>& src);
      
      virtual ~ValueImplT();
      
      void set(const Pointer<ValueType>& value);
      
      void setValue(const Variant::Value& value);
      
      ValueType& getValue();
      
      const ValueType& getValue() const;
      
      double getNumericValue() const;
    
      bool isEqual(const Variant::Value& value) const;
      
      ValuePtr clone() const;
      
      void read(std::istream& stream);
    
      void write(std::ostream& stream) const;
      
      Serializer createSerializer(const DataType& type) const;
      
      Pointer<ValueType> value;
    };
    
    template <typename T> static BuiltinVariant create(const DataType& type);
    
    template <typename T> static double getNumericValue(const T& value,
      typename boost::enable_if<boost::type_traits::ice_or<boost::is_base_of<
      ros::Duration, T>::value, boost::is_base_of<ros::Time, T>::value> >::
      type* = 0);
      
    template <typename T> static double getNumericValue(const T& value,
      typename boost::enable_if<typename type_traits::BuiltinType<T>::
      IsNumeric>::type* = 0, typename boost::disable_if<boost::type_traits::
      ice_or<boost::is_base_of<ros::Duration, T>::value, boost::is_base_of<
      ros::Time, T>::value> >::type* = 0);
      
    template <typename T> static double getNumericValue(const T& value,
      typename boost::disable_if<typename type_traits::BuiltinType<T>::
      IsNumeric>::type* = 0);
    
    template <typename T> static bool isEqual(const typename type_traits::
      BuiltinType<T>::ValueType& lhs, const typename type_traits::
      BuiltinType<T>::ValueType& rhs, typename boost::enable_if<boost::
      has_equal_to<typename type_traits::BuiltinType<T>::ValueType,
      typename type_traits::BuiltinType<T>::ValueType, bool> >::type* = 0);
    
    template <typename T> static bool isEqual(const typename type_traits::
      BuiltinType<T>::ValueType& lhs, const typename type_traits::
      BuiltinType<T>::ValueType& rhs, typename boost::disable_if<boost::
      has_equal_to<typename type_traits::BuiltinType<T>::ValueType,
      typename type_traits::BuiltinType<T>::ValueType, bool> >::type* = 0);
    
    template <typename T> static void read(std::istream& stream,
      typename type_traits::BuiltinType<T>::ValueType& value, typename
      boost::enable_if<boost::is_same<T, bool> >::type* = 0);
    
    template <typename T> static void read(std::istream& stream,
      typename type_traits::BuiltinType<T>::ValueType& value, typename
      boost::disable_if<boost::is_same<T, bool> >::type* = 0, typename
      boost::enable_if<boost::has_right_shift<std::istream, typename
      type_traits::BuiltinType<T>::ValueType&> >::type* = 0);
    
    template <typename T> static void read(std::istream& stream,
      typename type_traits::BuiltinType<T>::ValueType& value, typename
      boost::disable_if<boost::is_same<T, bool> >::type* = 0, typename
      boost::disable_if<boost::has_right_shift<std::istream, typename
      type_traits::BuiltinType<T>::ValueType&> >::type* = 0);

    template <typename T> static void write(std::ostream& stream, const
      typename type_traits::BuiltinType<T>::ValueType& value, typename
      boost::enable_if<boost::is_same<T, bool> >::type* = 0);
    
    template <typename T> static void write(std::ostream& stream, const
      typename type_traits::BuiltinType<T>::ValueType& value, typename
      boost::disable_if<boost::is_same<T, bool> >::type* = 0, typename
      boost::enable_if<boost::has_left_shift<std::ostream, const typename
      type_traits::BuiltinType<T>::ValueType&> >::type* = 0);
    
    template <typename T> static void write(std::ostream& stream, const
      typename type_traits::BuiltinType<T>::ValueType& value, typename
      boost::disable_if<boost::is_same<T, bool> >::type* = 0, typename
      boost::disable_if<boost::has_left_shift<std::ostream, const typename
      type_traits::BuiltinType<T>::ValueType&> >::type* = 0);
  };
};

#include <variant_topic_tools/BuiltinVariant.tpp>

#endif