generic-library/ChaiScript
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Massive simplification of boxed_cast. More planned

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This commit is contained in:
Jason Turner
2016-04-13 14:09:08 -06:00
parent 8d808f75c0
commit 6f0d02f158
6 changed files with 46 additions and 79 deletions
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103
include/chaiscript/dispatchkit/boxed_cast_helper.hpp
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@@ -29,21 +29,36 @@ namespace chaiscript
throw std::runtime_error("Attempted to dereference null Boxed_Value");
}
const void *verify_type(const Boxed_Value &ob, const std::type_info &ti, const void *ptr) {
if (!ob.get_type_info().bare_equal_type_info(ti)) {
throw chaiscript::detail::exception::bad_any_cast();
} else {
return throw_if_null(ptr);
}
}
void *verify_type(const Boxed_Value &ob, const std::type_info &ti, void *ptr) {
if (ptr == nullptr || !ob.get_type_info().bare_equal_type_info(ti)) {
throw chaiscript::detail::exception::bad_any_cast();
} else {
return ptr;
}
}
/*
template<typename Result, typename = enable_if<Result>>
Result cast_helper_inner(const Boxed_Value &ob, const Type_Conversions_State *)
{
}
*/
/// Generic Cast_Helper_Inner, for casting to any type
template<typename Result>
struct Cast_Helper_Inner
{
typedef typename std::add_const<Result>::type Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *)
static Result cast(const Boxed_Value &ob, const Type_Conversions_State *)
{
if (ob.get_type_info().bare_equal_type_info(typeid(Result)))
{
auto p = throw_if_null(ob.get_const_ptr());
return *static_cast<const Result *>(p);
} else {
throw chaiscript::detail::exception::bad_any_cast();
}
return *static_cast<const Result *>(verify_type(ob, typeid(Result), ob.get_const_ptr()));
}
};
@@ -57,15 +72,9 @@ namespace chaiscript
template<typename Result>
struct Cast_Helper_Inner<const Result *>
{
typedef const Result * Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *)
static auto cast(const Boxed_Value &ob, const Type_Conversions_State *)
{
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();
}
return static_cast<const Result *>(verify_type(ob, typeid(Result), ob.get_const_ptr()));
}
};
@@ -73,15 +82,9 @@ namespace chaiscript
template<typename Result>
struct Cast_Helper_Inner<Result *>
{
typedef Result * Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *)
static auto cast(const Boxed_Value &ob, const Type_Conversions_State *)
{
if (!ob.get_type_info().is_const() && ob.get_type_info() == typeid(Result))
{
return static_cast<Result *>(ob.get_ptr());
} else {
throw chaiscript::detail::exception::bad_any_cast();
}
return static_cast<Result *>(verify_type(ob, typeid(Result), ob.get_ptr()));
}
};
@@ -100,17 +103,9 @@ namespace chaiscript
template<typename Result>
struct Cast_Helper_Inner<const Result &>
{
typedef const Result& Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *)
static const Result & cast(const Boxed_Value &ob, const Type_Conversions_State *)
{
if (ob.get_type_info().bare_equal_type_info(typeid(Result)))
{
auto p = throw_if_null(ob.get_const_ptr());
return *static_cast<const Result *>(p);
} else {
throw chaiscript::detail::exception::bad_any_cast();
}
return *static_cast<const Result *>(verify_type(ob, typeid(Result), ob.get_const_ptr()));
}
};
@@ -120,16 +115,9 @@ namespace chaiscript
template<typename Result>
struct Cast_Helper_Inner<Result &>
{
typedef Result& Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *)
static Result& cast(const Boxed_Value &ob, const Type_Conversions_State *)
{
if (!ob.get_type_info().is_const() && ob.get_type_info().bare_equal_type_info(typeid(Result)))
{
return *(static_cast<Result *>(throw_if_null(ob.get_ptr())));
} else {
throw chaiscript::detail::exception::bad_any_cast();
}
return *static_cast<Result *>(verify_type(ob, typeid(Result), ob.get_ptr()));
}
};
@@ -137,9 +125,7 @@ namespace chaiscript
template<typename Result>
struct Cast_Helper_Inner<std::shared_ptr<Result> >
{
typedef std::shared_ptr<Result> Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *)
static auto cast(const Boxed_Value &ob, const Type_Conversions_State *)
{
return ob.get().cast<std::shared_ptr<Result> >();
}
@@ -149,9 +135,7 @@ namespace chaiscript
template<typename Result>
struct Cast_Helper_Inner<std::shared_ptr<const Result> >
{
typedef std::shared_ptr<const Result> Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *)
static auto cast(const Boxed_Value &ob, const Type_Conversions_State *)
{
if (!ob.get_type_info().is_const())
{
@@ -177,10 +161,7 @@ namespace chaiscript
struct Cast_Helper_Inner<std::shared_ptr<Result> &>
{
static_assert(!std::is_const<Result>::value, "Non-const reference to std::shared_ptr<const T> is not supported");
typedef Boxed_Value::Sentinel<Result> Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *)
static auto cast(const Boxed_Value &ob, const Type_Conversions_State *)
{
std::shared_ptr<Result> &res = ob.get().cast<std::shared_ptr<Result> >();
return ob.pointer_sentinel(res);
@@ -204,9 +185,7 @@ namespace chaiscript
template<>
struct Cast_Helper_Inner<Boxed_Value>
{
typedef Boxed_Value Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *)
static Boxed_Value cast(const Boxed_Value &ob, const Type_Conversions_State *)
{
return ob;
}
@@ -216,9 +195,7 @@ namespace chaiscript
template<>
struct Cast_Helper_Inner<Boxed_Value &>
{
typedef std::reference_wrapper<Boxed_Value> Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *)
static std::reference_wrapper<Boxed_Value> cast(const Boxed_Value &ob, const Type_Conversions_State *)
{
return std::ref(const_cast<Boxed_Value &>(ob));
}
@@ -272,9 +249,7 @@ namespace chaiscript
template<typename T>
struct Cast_Helper
{
typedef typename Cast_Helper_Inner<T>::Result_Type Result_Type;
static Result_Type cast(const Boxed_Value &ob, const Type_Conversions_State *t_conversions)
static auto cast(const Boxed_Value &ob, const Type_Conversions_State *t_conversions) -> decltype(Cast_Helper_Inner<T>::cast(ob, t_conversions))
{
return Cast_Helper_Inner<T>::cast(ob, t_conversions);
}