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Implement a general and easy-to-use way of overriding native virtual functions

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This commit is contained in:
Leonard2 2016-11-01 04:58:10 +01:00
parent bb2d61de50
commit ad19e439a6
1 changed files with 75 additions and 1 deletions
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76
src/dobject.h
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@ -125,8 +125,8 @@ enum EInPlace { EC_InPlace };
public: \
virtual PClass *StaticType() const; \
static ClassReg RegistrationInfo, * const RegistrationInfoPtr; \
private: \
typedef parent Super; \
private: \
typedef cls ThisClass;
#define DECLARE_ABSTRACT_CLASS_WITH_META(cls,parent,meta) \
@ -151,6 +151,34 @@ protected: \
#define HAS_FIELDS \
static void InitNativeFields();
// Templates really are powerful
#define VMEXPORTED_NATIVES_START \
template<class owner> class ExportedNatives : public ExportedNatives<typename owner::Super> {}; \
template<> class ExportedNatives<void> { \
protected: ExportedNatives<void>() {} \
public: \
static ExportedNatives<void> *Get() { static ExportedNatives<void> *Instance = nullptr; if (Instance == nullptr) Instance = new ExportedNatives<void>; return Instance; } \
ExportedNatives<void>(const ExportedNatives<void>&) = delete; \
ExportedNatives<void>(ExportedNatives<void>&&) = delete;
#define VMEXPORTED_NATIVES_FUNC(func) \
template<class ret, class object, class ... args> ret func(void *ptr, args ... arglist) { return ret(); }
#define VMEXPORTED_NATIVES_END };
#define VMEXPORT_NATIVES_START(cls, parent) \
template<> class ExportedNatives<cls> : public ExportedNatives<parent> { \
protected: ExportedNatives<cls>() {} \
public: \
static ExportedNatives<cls> *Get() { static ExportedNatives<cls> *Instance = nullptr; if (Instance == nullptr) Instance = new ExportedNatives<cls>; return Instance; } \
ExportedNatives<cls>(const ExportedNatives<cls>&) = delete; \
ExportedNatives<cls>(ExportedNatives<cls>&&) = delete;
#define VMEXPORT_NATIVES_FUNC(func) \
template<class ret, class object, class ... args> ret func(void *ptr, args ... arglist) { return static_cast<object *>(ptr)->object::##func(arglist...); }
#define VMEXPORT_NATIVES_END(cls) };
#if defined(_MSC_VER)
# pragma section(".creg$u",read)
# define _DECLARE_TI(cls) __declspec(allocate(".creg$u")) ClassReg * const cls::RegistrationInfoPtr = &cls::RegistrationInfo;
@ -576,6 +604,52 @@ protected:
}
};
template<class T>
class DVMObject : public T
{
public:
static char *FormatClassName()
{
static char *name = nullptr;
if (name == nullptr)
{
name = new char[64];
mysnprintf(name, 64, "DVMObject<%s>", Super::RegistrationInfo.Name);
atterm([]{ delete[] DVMObject<T>::RegistrationInfo.Name; });
}
return name;
}
virtual PClass *StaticType() const
{
return RegistrationInfo.MyClass;
}
static ClassReg RegistrationInfo;
static ClassReg * const RegistrationInfoPtr;
typedef T Super;
private:
typedef DVMObject<T> ThisClass;
static void InPlaceConstructor(void *mem)
{
new((EInPlace *)mem) DVMObject<T>;
}
};
template<class T>
ClassReg DVMObject<T>::RegistrationInfo =
{
nullptr,
DVMObject<T>::FormatClassName(),
&DVMObject<T>::Super::RegistrationInfo,
nullptr,
DVMObject<T>::InPlaceConstructor,
nullptr,
sizeof(DVMObject<T>),
DVMObject<T>::MetaClassNum
};
template<class T> _DECLARE_TI(DVMObject<T>)
// When you write to a pointer to an Object, you must call this for
// proper bookkeeping in case the Object holding this pointer has
// already been processed by the GC.