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template<typename Sequence , typename Policy >
Policy::return_type	search (const Policy &policy)

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template<typename Sequence , typename Policy >

Policy::return_type moost::mpl::search ( const Policy & policy ) [inline]

Search type in a type list according to a policy

This template attempts to find a type in a type list using the policy's test() method and then either calls the policy's found() or not_found() method.

Here's an example policy for implementing an object factory:

class factory_policy
{
public:
   typedef base *return_type;

   factory_policy(const std::string& name)
      : m_name(name)
   {
   }

   template <class T>
   bool test() const
   {
      return m_name == T::name();
   }

   template <class T>
   return_type found() const
   {
      return new T();
   }

   return_type not_found() const
   {
      throw std::runtime_error("unknown class " + m_name);
   }

private:
   const std::string& m_name;
};

You could then use the policy like this:

factory_policy policy(name);
base *obj = search<class_list>(policy);

Definition at line 120 of file search.hpp.

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