add relect
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aozhiwei
parent
5c144d4357
commit
966f7119e7
276
a8/reflect.h
Normal file
276
a8/reflect.h
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#pragma once
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#include <type_traits>
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namespace a8
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{
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namespace reflect
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{
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enum FieldType
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{
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ET_INT32 = 1,
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ET_UINT32 = 2,
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ET_INT64 = 3,
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ET_UINT64 = 4,
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ET_DOUBLE = 5,
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ET_STRING = 6,
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ET_CLASS = 7,
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ET_INTERFACE = 8,
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};
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enum FieldSubType
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{
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EST_SIMPLE = 1,
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EST_SIMPLE_POINTER = 2,
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EST_CONTAINRER = 3,
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EST_CONTAINRER_POINTER = 4,
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};
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struct Field;
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class Class;
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typedef bool (*FIELD_FOR_EACH_FUNC)(a8::reflect::Field*, void*, void*);
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struct Field
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{
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const char* field_name = nullptr;
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int type = 0; //int uint int64 uint64 double string class interface class_pointer
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int subtype = 0; //std::vector<x> std::list<x>
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int offset = 0;
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a8::reflect::Class **pp_generic_class = nullptr; //泛型容器类型指针的指针
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void* (*create)() = nullptr;
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void (*destroy)(void*) = nullptr;
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int (*size)(void*) = nullptr;
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void (*for_each)(a8::reflect::Field*, void*, void* , FIELD_FOR_EACH_FUNC) = nullptr;
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char* (*push_back)(void*) = nullptr;
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};
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class Class
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{
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public:
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void* (*create)() = nullptr;
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void (*destroy)(void*) = nullptr;
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void (*copy)(void*, void*) = nullptr;
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Class(const char* classname, int fieldnum, int tag)
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{
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class_name_ = classname;
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tag_ = tag;
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fields_ = new a8::reflect::Field[fieldnum];
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fieldnum_ = fieldnum;
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}
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a8::reflect::Field* GetDeclaredFields()
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{
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return fields_;
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}
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int FieldNum()
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{
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return fieldnum_;
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}
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int ClassId()
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{
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return class_id_;
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}
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int Tag()
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{
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return tag_;
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}
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void SetField(int fieldidx,
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const char* fieldname,
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int type,
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int subtype,
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int offset,
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a8::reflect::Class **pp_generic_class,
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void* (*create)(),
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void (*destroy)(void*),
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int (*size)(void*),
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void (*for_each)(a8::reflect::Field*, void*, void*, FIELD_FOR_EACH_FUNC),
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char* (*push_back)(void*)
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)
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{
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a8::reflect::Field *p = fields_ + fieldidx;
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p->field_name = fieldname;
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p->type = type;
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p->subtype = subtype;
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p->offset = offset;
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p->pp_generic_class = pp_generic_class;
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p->create = create;
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p->destroy = destroy;
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p->size = size;
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p->for_each = for_each;
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p->push_back = push_back;
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}
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int GetFieldIdx(int offset)
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{
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for (int i = 0; i < fieldnum_; i++) {
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if (fields_[i].offset == offset) {
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return i;
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}
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}
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return -1;
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}
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const char* ClassName()
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{
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return class_name_;
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}
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private:
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int class_id_ = 0;
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int tag_ = 0;
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int fieldnum_ = 0;
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const char* class_name_ = nullptr;
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a8::reflect::Field* fields_ = nullptr;
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};
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template <typename T>
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static void* _create()
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{
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return (void*) new T();
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}
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template <typename T>
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static void _destroy(void* instance)
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{
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T* p = (T*)instance;
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delete p;
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}
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template <typename T>
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static void _copy(void* a, void* b)
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{
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*(T*)a = *(T*)b;
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}
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template <typename T>
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static int _size(void* instance)
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{
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T* p = (T*)instance;
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return p->size();
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}
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template <typename T>
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static void _for_each(a8::reflect::Field* field, void* instance, void* userdata,
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FIELD_FOR_EACH_FUNC callback)
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{
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T* p = (T*)instance;
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for (auto &itr : *p) {
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if (callback && !callback(field, userdata, (void*)&itr)) {
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break;
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}
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}
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}
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template <typename T>
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static char* _push_back(void* instance)
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{
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T* p = (T*)instance;
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return (char*)&a8::FastAppend(*p);
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}
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template <typename T>
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inline a8::reflect::Class** get_pp_generic_class(a8::ReflectibleObject& obj)
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{
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return &T::__metaclass;
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}
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template <typename T>
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inline a8::reflect::Class** get_pp_generic_class(const T& obj)
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{
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return nullptr;
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}
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}
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}
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#define my_offsetof2(TYPE, MEMBER) \
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((size_t)((char *)&(((TYPE *)0x10)->MEMBER) - (char*)0x10))
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#define container_of2(ptr, type, member) ({ \
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const typeof( ((type *)0)->member ) *__mptr = (ptr); \
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(type *)( (char *)__mptr - my_offsetof2(type,member) );})
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#define BEGIN_MSG_CLASS(classname, fieldnum) \
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{ \
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a8::reflect::Class *metaclass = new a8::reflect::Class(#classname, fieldnum, classname::CLSID); \
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metaclass->create =&a8::reflect::_create<classname>; \
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metaclass->destroy =&a8::reflect::_destroy<classname>; \
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metaclass->copy =&a8::reflect::_copy<classname>; \
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classname::__metaclass = metaclass; \
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classname p;
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#define END_MSG_CLASS() \
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}
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#define BEGIN_MFMSG_CLASS(classname, fieldnum) \
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{ \
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a8::reflect::Class *metaclass = new a8::reflect::Class(#classname, fieldnum, classname::CLSID); \
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metaclass->create =&a8::reflect::_create<classname>; \
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metaclass->destroy =&a8::reflect::_destroy<classname>; \
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metaclass->copy =&a8::reflect::_copy<classname>; \
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classname::__metaclass = metaclass; \
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assert(classname::CLSID < 1024); \
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s_mfclass_metaclasses[classname::CLSID] = metaclass; \
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classname p;
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#define END_MFMSG_CLASS() \
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}
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#define DEFINE_SIMPLE_FIELD(fieldidx, fieldname, type) \
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metaclass->SetField(fieldidx, \
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#fieldname, \
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type, \
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a8::reflect::EST_SIMPLE, \
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my_offsetof2(decltype(p), fieldname), \
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NULL, \
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NULL, \
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NULL, \
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NULL, \
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NULL, \
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NULL);
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#define DEFINE_SIMPLE_POINTER_FIELD(fieldidx, fieldname, type) \
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metaclass->SetField(fieldidx, \
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#fieldname, \
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type, \
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a8::reflect::EST_SIMPLE_POINTER, \
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my_offsetof2(decltype(p), fieldname), \
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NULL, \
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NULL, \
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NULL, \
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NULL, \
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NULL, \
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NULL);
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#define DEFINE_CONTAINRER_FIELD(fieldidx, fieldname, type) \
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metaclass->SetField(fieldidx, \
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#fieldname, \
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type, \
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a8::reflect::EST_CONTAINRER, \
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my_offsetof2(decltype(p), fieldname), \
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a8::reflect::get_pp_generic_class<decltype(p.fieldname)>(p.fieldname), \
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&a8::reflect::_create<decltype(p.fieldname)>, \
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&a8::reflect::_destroy<decltype(p.fieldname)>, \
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&a8::reflect::_size<decltype(p.fieldname)>, \
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&a8::reflect::_for_each<decltype(p.fieldname)> , \
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&a8::reflect::_push_back<decltype(p.fieldname)> \
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);
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#define DEFINE_CONTAINRER_POINTER_FIELD(fieldidx, fieldname, type) \
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metaclass->SetField(fieldidx, \
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#fieldname, \
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type, \
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a8::reflect::EST_CONTAINRER_POINTER, \
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my_offsetof2(decltype(p), fieldname), \
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a8::reflect::get_pp_generic_class<decltype(p.fieldname)>(p.fieldname), \
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&a8::reflect::_create<decltype(p.fieldname)>, \
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&a8::reflect::_destroy<decltype(p.fieldname)>, \
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&a8::reflect::_size<decltype(p.fieldname)>, \
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&a8::reflect::_for_each<decltype(p.fieldname)> , \
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&a8::reflect::_push_back<decltype(p.fieldname)> \
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);
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