Remove boost::any requirement by providing our own implementation

include/chaiscript/dispatchkit/any.hpp

@@ -0,0 +1,162 @@
+// This file is distributed under the BSD License.
+// See "license.txt" for details.
+// Copyright 2009-2011, Jonathan Turner (jonathan@emptycrate.com)
+// and Jason Turner (jason@emptycrate.com)
+// http://www.chaiscript.com
+
+#ifndef CHAISCRIPT_ANY_HPP_
+#define CHAISCRIPT_ANY_HPP_
+
+namespace chaiscript {
+  namespace detail {
+    namespace exception
+    {
+      /// \brief Thrown in the event that an Any cannot be cast to the desired type
+      ///
+      /// It is used internally during function dispatch.
+      ///
+      /// \sa chaiscript::detail::Any
+      class bad_any_cast : public std::bad_cast
+      {
+        public:
+          bad_any_cast() throw()
+            : m_what("bad any cast")
+          {
+          }
+
+          virtual ~bad_any_cast() throw() {}
+
+          /// \brief Description of what error occured
+          virtual const char * what() const throw()
+          {
+            return m_what.c_str();
+          }
+
+        private:
+          std::string m_what;
+      };
+    }
+  
+
+    class Any {
+      private:
+        struct Data
+        {
+          virtual void *data() = 0;
+          virtual const std::type_info &type() const = 0;
+          virtual std::shared_ptr<Data> clone() const = 0;
+        };
+
+        template<typename T>
+          struct Data_Impl : Data
+          {
+            Data_Impl(const T &t_type)
+              : m_type(typeid(T)),
+                m_data(t_type)
+            {
+            }
+
+            virtual void *data()
+            {
+              return &m_data;
+            }
+
+            const std::type_info &type() const
+            {
+              return m_type;
+            }
+
+            std::shared_ptr<Data> clone() const
+            {
+              return std::shared_ptr<Data>(new Data_Impl<T>(m_data));
+            }
+
+            const std::type_info &m_type;
+            T m_data;
+          };
+
+        std::shared_ptr<Data> m_data;
+
+      public:
+        // construct/copy/destruct
+        Any() {}
+
+        Any(const Any &t_any) 
+        { 
+          if (!t_any.empty())
+          {
+            m_data = t_any.m_data->clone(); 
+          } else {
+            m_data.reset();
+          }
+        }
+
+        template<typename ValueType> 
+          Any(const ValueType &t_value)
+        {
+          m_data = std::shared_ptr<Data>(new Data_Impl<ValueType>(t_value));
+        }
+
+        Any & operator=(const Any &t_any)
+        {
+          Any copy(t_any);
+          swap(copy);
+          return *this; 
+        }
+
+        template<typename ValueType> 
+          Any & operator=(const ValueType &t_value)
+        {
+          m_data = std::shared_ptr<Data>(new Data_Impl<ValueType>(t_value));
+          return *this;
+        }
+
+        template<typename ToType>
+          ToType &cast() const
+          {
+            if (typeid(ToType) == m_data->type())
+            {
+              return *static_cast<ToType *>(m_data->data());
+            } else {
+              throw chaiscript::detail::exception::bad_any_cast();
+            }
+ 
+          }
+
+
+        ~Any()
+        {
+        }
+
+        // modifiers
+        Any & swap(Any &t_other)
+        {
+          std::shared_ptr<Data> data = t_other.m_data;
+          t_other.m_data = m_data;
+          m_data = data;
+          return *this;
+        }
+
+        // queries
+        bool empty() const
+        {
+          return !bool(m_data);
+        }
+
+        const std::type_info & type() const
+        {
+          if (m_data)
+          {
+            return m_data->type();
+          } else {
+            return typeid(void);
+          }
+        }
+    };
+
+  }
+}
+
+#endif
+
+