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Throw exception if user attempts to use null Boxed_Value

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This commit is contained in:
Jason Turner
2014-09-09 13:43:05 -06:00
parent 308eb34d05
commit fde90ad980
2 changed files with 52 additions and 24 deletions
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74
include/chaiscript/dispatchkit/boxed_cast_helper.hpp
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@@ -23,6 +23,13 @@ namespace chaiscript
{
// Cast_Helper_Inner helper classes
template<typename T>
T* throw_if_null(T *t)
{
if (t) return t;
throw std::runtime_error("Attempted to dereference null Boxed_Value");
}
/**
* Generic Cast_Helper_Inner, for casting to any type
*/
@@ -33,21 +40,11 @@ namespace chaiscript
static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *)
{
if (ob.is_ref())
if (ob.get_type_info().bare_equal_type_info(typeid(Result)))
{
if (!ob.get_type_info().is_const())
{
return std::cref((ob.get().cast<std::reference_wrapper<Result> >()).get());
} else {
return ob.get().cast<std::reference_wrapper<const Result> >();
}
return *(static_cast<const Result *>(throw_if_null(ob.get_const_ptr())));
} else {
if (!ob.get_type_info().is_const())
{
return std::cref(*(ob.get().cast<std::shared_ptr<Result> >()));
} else {
return std::cref(*(ob.get().cast<std::shared_ptr<const Result> >()));
}
throw chaiscript::detail::exception::bad_any_cast();
}
}
};
@@ -65,14 +62,46 @@ namespace chaiscript
{
};
/**
* Cast_Helper_Inner for casting to a const * type
*/
/*
/// 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, const Dynamic_Cast_Conversions *)
{
if (ob.get_type_info().bare_equal_type_info(typeid(Result)))
{
return static_cast<const Result *>(ob.get_const_ptr());
} else {
throw chaiscript::detail::exception::bad_any_cast();
}
}
};
/// 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, const Dynamic_Cast_Conversions *)
{
if (!ob.get_type_info().is_const() && ob.get_type_info().bare_equal_type_info(typeid(Result)))
{
return static_cast<Result *>(ob.get_ptr());
} else {
throw chaiscript::detail::exception::bad_any_cast();
}
}
};
*/
template<typename Result>
struct Cast_Helper_Inner<const Result *>
{
typedef const Result * Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *)
{
if (ob.is_ref())
@@ -95,13 +124,12 @@ namespace chaiscript
};
/**
* Cast_Helper_Inner for casting to a * type
*/
* * 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, const Dynamic_Cast_Conversions *)
{
if (ob.is_ref())
@@ -113,6 +141,7 @@ namespace chaiscript
}
};
/**
* Cast_Helper_Inner for casting to a & type
*/
@@ -123,12 +152,11 @@ namespace chaiscript
static Result_Type cast(const Boxed_Value &ob, const Dynamic_Cast_Conversions *)
{
if (ob.is_ref())
if (!ob.get_type_info().is_const() && ob.get_type_info().bare_equal_type_info(typeid(Result)))
{
return ob.get().cast<std::reference_wrapper<Result> >();
return *(static_cast<Result *>(throw_if_null(ob.get_ptr())));
} else {
Result &r = *(ob.get().cast<std::shared_ptr<Result> >());
return r;
throw chaiscript::detail::exception::bad_any_cast();
}
}
};