272 lines
7.4 KiB
C++
272 lines
7.4 KiB
C++
// 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_BOXED_CAST_HELPER_HPP_
|
|
#define CHAISCRIPT_BOXED_CAST_HELPER_HPP_
|
|
|
|
#include "type_info.hpp"
|
|
#include "boxed_value.hpp"
|
|
|
|
#include <boost/any.hpp>
|
|
|
|
namespace chaiscript
|
|
{
|
|
namespace detail
|
|
{
|
|
// Cast_Helper_Inner helper classes
|
|
|
|
/**
|
|
* Generic Cast_Helper_Inner, for casting to any type
|
|
*/
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner
|
|
{
|
|
typedef typename std::reference_wrapper<typename std::add_const<Result>::type > Result_Type;
|
|
|
|
static Result_Type cast(const Boxed_Value &ob)
|
|
{
|
|
if (ob.is_ref())
|
|
{
|
|
if (!ob.get_type_info().is_const())
|
|
{
|
|
return std::cref((boost::any_cast<std::reference_wrapper<Result> >(ob.get())).get());
|
|
} else {
|
|
return boost::any_cast<std::reference_wrapper<const Result> >(ob.get());
|
|
}
|
|
} else {
|
|
if (!ob.get_type_info().is_const())
|
|
{
|
|
return std::cref(*(boost::any_cast<std::shared_ptr<Result> >(ob.get())));
|
|
} else {
|
|
return std::cref(*(boost::any_cast<std::shared_ptr<const Result> >(ob.get())));
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<const Result> : Cast_Helper_Inner<Result>
|
|
{
|
|
};
|
|
|
|
/**
|
|
* Cast_Helper_Inner for casting to a const & type
|
|
*/
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<const Result &> : Cast_Helper_Inner<Result>
|
|
{
|
|
};
|
|
|
|
/**
|
|
* Cast_Helper_Inner for casting to a const * type
|
|
*/
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<const Result *>
|
|
{
|
|
typedef const Result * Result_Type;
|
|
|
|
static Result_Type cast(const Boxed_Value &ob)
|
|
{
|
|
if (ob.is_ref())
|
|
{
|
|
if (!ob.get_type_info().is_const())
|
|
{
|
|
return &(boost::any_cast<std::reference_wrapper<Result> >(ob.get())).get();
|
|
} else {
|
|
return &(boost::any_cast<std::reference_wrapper<const Result> >(ob.get())).get();
|
|
}
|
|
} else {
|
|
if (!ob.get_type_info().is_const())
|
|
{
|
|
return (boost::any_cast<std::shared_ptr<Result> >(ob.get())).get();
|
|
} else {
|
|
return (boost::any_cast<std::shared_ptr<const Result> >(ob.get())).get();
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Cast_Helper_Inner for casting to a * type
|
|
*/
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<Result *>
|
|
{
|
|
typedef Result * Result_Type;
|
|
|
|
static Result_Type cast(const Boxed_Value &ob)
|
|
{
|
|
if (ob.is_ref())
|
|
{
|
|
return &(boost::any_cast<std::reference_wrapper<Result> >(ob.get())).get();
|
|
} else {
|
|
return (boost::any_cast<std::shared_ptr<Result> >(ob.get())).get();
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Cast_Helper_Inner for casting to a & type
|
|
*/
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<Result &>
|
|
{
|
|
typedef Result& Result_Type;
|
|
|
|
static Result &cast(const Boxed_Value &ob)
|
|
{
|
|
if (ob.is_ref())
|
|
{
|
|
return boost::any_cast<std::reference_wrapper<Result> >(ob.get());
|
|
} else {
|
|
Result &r = *(boost::any_cast<std::shared_ptr<Result> >(ob.get()));
|
|
return r;
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Cast_Helper_Inner for casting to a std::shared_ptr<> type
|
|
*/
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<typename std::shared_ptr<Result> >
|
|
{
|
|
typedef typename std::shared_ptr<Result> Result_Type;
|
|
|
|
static Result_Type cast(const Boxed_Value &ob)
|
|
{
|
|
return boost::any_cast<std::shared_ptr<Result> >(ob.get());
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Cast_Helper_Inner for casting to a std::shared_ptr<const> type
|
|
*/
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<typename std::shared_ptr<const Result> >
|
|
{
|
|
typedef typename std::shared_ptr<const Result> Result_Type;
|
|
|
|
static Result_Type cast(const Boxed_Value &ob)
|
|
{
|
|
if (!ob.get_type_info().is_const())
|
|
{
|
|
return std::const_pointer_cast<const Result>(boost::any_cast<std::shared_ptr<Result> >(ob.get()));
|
|
} else {
|
|
return boost::any_cast<std::shared_ptr<const Result> >(ob.get());
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Cast_Helper_Inner for casting to a const std::shared_ptr<> & type
|
|
*/
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<const std::shared_ptr<Result> > : Cast_Helper_Inner<std::shared_ptr<Result> >
|
|
{
|
|
};
|
|
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<const std::shared_ptr<Result> &> : Cast_Helper_Inner<std::shared_ptr<Result> >
|
|
{
|
|
};
|
|
|
|
|
|
/**
|
|
* Cast_Helper_Inner for casting to a const std::shared_ptr<const> & type
|
|
*/
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<const std::shared_ptr<const Result> > : Cast_Helper_Inner<std::shared_ptr<const Result> >
|
|
{
|
|
};
|
|
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<const std::shared_ptr<const Result> &> : Cast_Helper_Inner<std::shared_ptr<const Result> >
|
|
{
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
* Cast_Helper_Inner for casting to a Boxed_Value type
|
|
*/
|
|
template<>
|
|
struct Cast_Helper_Inner<Boxed_Value>
|
|
{
|
|
typedef const Boxed_Value & Result_Type;
|
|
|
|
static Result_Type cast(const Boxed_Value &ob)
|
|
{
|
|
return ob;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Cast_Helper_Inner for casting to a const Boxed_Value & type
|
|
*/
|
|
template<>
|
|
struct Cast_Helper_Inner<const Boxed_Value> : Cast_Helper_Inner<Boxed_Value>
|
|
{
|
|
};
|
|
|
|
template<>
|
|
struct Cast_Helper_Inner<const Boxed_Value &> : Cast_Helper_Inner<Boxed_Value>
|
|
{
|
|
};
|
|
|
|
|
|
/**
|
|
* Cast_Helper_Inner for casting to a std::reference_wrapper type
|
|
*/
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<std::reference_wrapper<Result> > : Cast_Helper_Inner<Result &>
|
|
{
|
|
};
|
|
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<const std::reference_wrapper<Result> > : Cast_Helper_Inner<Result &>
|
|
{
|
|
};
|
|
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<const std::reference_wrapper<Result> &> : Cast_Helper_Inner<Result &>
|
|
{
|
|
};
|
|
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<std::reference_wrapper<const Result> > : Cast_Helper_Inner<const Result &>
|
|
{
|
|
};
|
|
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<const std::reference_wrapper<const Result> > : Cast_Helper_Inner<const Result &>
|
|
{
|
|
};
|
|
|
|
template<typename Result>
|
|
struct Cast_Helper_Inner<const std::reference_wrapper<const Result> & > : Cast_Helper_Inner<const Result &>
|
|
{
|
|
};
|
|
|
|
/**
|
|
* The exposed Cast_Helper object that by default just calls the Cast_Helper_Inner
|
|
*/
|
|
template<typename T>
|
|
struct Cast_Helper
|
|
{
|
|
typedef typename Cast_Helper_Inner<T>::Result_Type Result_Type;
|
|
|
|
static Result_Type cast(const Boxed_Value &ob)
|
|
{
|
|
return Cast_Helper_Inner<T>::cast(ob);
|
|
}
|
|
};
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|