我的一个面向对象的C语言宏定义系统
参考了网上很多人的代码,不一一列举了
/* ======================================================================== */
/* 这一区块定义下面用到的一些名字组成宏 */
/* 类方法名字拼接 */
#define METHOD(class, method) class##_##method
/* 类方法的类型的名字拼接 */
#define METHOD_TYPE(class, method) __##class##_##method##_typedef__
/* 类的虚函数表结构的名字拼接 */
#define VTBL_STRU_NAME(class) __##class##_v_func_tbl__
/* 类的虚函数在虚函数表中的位置的名字拼接 */
#define VTBL_FUNC_PTR_NAME(class, func) __##class##_fp_##func##_offset__
/* 类的虚函数表实体的名字拼接 */
#define VTBL_ENTITY_NAME(class) __##class##_vtable_array__
/* 类的虚函数表实体初始化函数的名字拼接 */
#define VTBL_ENTITY_INIT_METHOD(class) __##class##_class_vtable_init__
/* 类的虚函数表实体是否初始化OK的名字拼接 */
#define VTBL_ENTITY_IS_INIT_FLAG(class) __##class##_class_vtable_is_init__
/* 类的虚函数表实体初始化结构变量的名字拼接 */
#define VTBL_ENTITY_INIT_STRU_VAR(class) class##_class_vtable_init_info
/* 获取类的虚函数表初始化函数的指针 */
#define VTBL_ENTITY_INIT_METHOD_PTR(class) ( VTBL_ENTITY_INIT_STRU_VAR(class) . vtable_init_method)
/* ======================================================================== */
/* ======================================================================== */
/* 创建接口 */
#define new(class) METHOD(class, create)()
/* 释放接口 */
#define delete(class, object) METHOD(class, destory)(object)
/* ======================================================================== */
/* ======================================================================== */
/* 类声明的开始宏 */
#define BEGIN_CLASS(class) \
struct class; \
typedef struct class class; \
struct VTBL_STRU_NAME(class); \
extern class_vtable_init VTBL_ENTITY_INIT_STRU_VAR(class); \
class * METHOD(class, create)(void); \
int METHOD(class, constructor)(class* this); \
void METHOD(class, destory)(class* this); \
int METHOD(class, destructor)(class* this); \
struct class
/* 继承自父类的声明 */
#define INHERITED_PARENT(p_class) \
p_class parent
/* 类中的虚函数声明开始宏 */
#define BEGIN_V_METHOD_DEFINE(class) \
struct VTBL_STRU_NAME(class)
/* 类继承自父类的虚函数信息 */
#define INHERITED_V_METHOD(p_class) \
struct VTBL_STRU_NAME(p_class) parent_vtbl
/* 单个虚函数声明处 */
#define DEFINE_V_METHOD(ret_type, method) \
ret_type (* method )(void* this, ...)
/* 类中的虚函数声明结束宏 */
#define END_V_METHOD_DEFINE(class)
/* 根类的对象声明 */
#define ROOT_CLASS_DECLARE(class) \
struct VTBL_STRU_NAME(class) *vbtl;
/* 类中的声明结束宏 */
#define END_CLASS(class)
/* ======================================================================== */
/* 虚拟函数指针的使用 */
#define GET_V_METHOD_PTR(class, func) \
( VTBL_FUNC_PTR_NAME(class, func) )
/* 定义虚拟函数的类型 */
#define DEFINE_V_METHOD_TYPE(ret_type, class, method) \
typedef ret_type (* METHOD_TYPE(class, method) )
/* 定义虚拟函数的指针 */
#define DEFINE_V_METHOD_PTR(class, method) \
enum { VTBL_FUNC_PTR_NAME(class, method) = \
(((int )(&((struct VTBL_STRU_NAME(class) *)0)-> method )) \
/ sizeof(std_func_ptr)) + 1 }; \
/* 定义继承的虚拟函数的指针 */
#define INHERITED_V_METHOD_PTR(class, parent, method) \
enum { VTBL_FUNC_PTR_NAME(class, method) = \
VTBL_FUNC_PTR_NAME(parent, method) }; \
/* 定义普通的虚拟函数的信息 */
#define DEFINE_V_METHOD_INFO(ret_type, class, method) \
DEFINE_V_METHOD_PTR(class, method); \
DEFINE_V_METHOD_TYPE(ret_type, class, method)
/* 定义继承的虚拟函数的信息 */
#define INHERITED_V_METHOD_INFO(ret_type, class, parent, method) \
INHERITED_V_METHOD_PTR(class, parent, method); \
DEFINE_V_METHOD_TYPE(ret_type, class, method)
/* 定义普通的成员函数的信息 */
#define DEFINE_C_METHOD_INFO(ret_type, class, method) \
extern ret_type METHOD(class, method)
/*
#define DEFINE_C_METHOD_INFO(ret_type, class, method) \
extern common_func_ptr __##class##_##method##_ptr__; \
typedef ret_type (* VTBL_FUNC_PTR_NAME(class, func) )
*/
/* 调用对象的虚拟函数 */
#define CALL_V_METHOD(object, class, method) \
(*(((*( METHOD_TYPE(class, method) **) object ))[ GET_V_METHOD_PTR(class,method) - 1 ]))
/* 调用对象的普通成员函数 */
#define CALL_C_METHOD(object, class, method) \
METHOD(class, method)
/*
#define DECLARE_V_METHOD(ret_type, class, method) \
ret_type METHOD(class, method)
#define DECLARE_C_METHOD(ret_type, class, method) \
common_func_ptr __##class##_##method##_ptr__ = METHOD(class, method); \
ret_type METHOD(class, method)
#define CALL_C_METHOD(ret_type, class, method) \
*(VTBL_FUNC_PTR_NAME(class, method)__##class##_##method##_ptr__)
*/
/* ======================================================================== */
/* 实现类,主要是绑定类的虚拟函数指针 */
#define BEGIN_DECLARE_CLASS_VTABLE(class) \
static std_func_ptr VTBL_ENTITY_NAME(class) [ \
sizeof(struct VTBL_STRU_NAME(class) )/sizeof(std_func_ptr)] = {0}; \
static char VTBL_ENTITY_IS_INIT_FLAG(class) = 0; \
static int VTBL_ENTITY_INIT_METHOD(class) (std_func_ptr *vtbl) \
{ \
if (0 != VTBL_ENTITY_IS_INIT_FLAG(class) ) return 1; \
if (0 == vtbl) return 0; \
do
/* 继承父类的VTABLE */
#define INHERITED_VTABLE_INIT(parent) \
if (0 == VTBL_ENTITY_INIT_METHOD_PTR(parent) (vtbl)) return 0
/* 继承的虚函数表项初始化 */
#define INHERITED_VTABLE_METHOD_INIT(class, parent, method) \
vtbl[((int )(&((struct VTBL_STRU_NAME(parent) * )0)-> method )) \
/ sizeof(std_func_ptr)] \
= (std_func_ptr) METHOD(class, method)
/* 自身的虚函数表项初始化 */
#define SELF_VTABLE_METHOD_INIT(class, method) \
INHERITED_VTABLE_METHOD_INIT(class, class, method)
/* 实现类的结束宏 */
#define END_DECLARE_CLASS_VTABLE(class) \
while(0); \
VTBL_ENTITY_IS_INIT_FLAG(class) = 1; \
return 1; \
} \
class_vtable_init VTBL_ENTITY_INIT_STRU_VAR(class) = \
{VTBL_ENTITY_INIT_METHOD(class), VTBL_ENTITY_NAME(class)};
/* ======================================================================== */
/* ======================================================================== */
/* 类的构造函数,主要提供两个接口:
一个是create,以支持new,
一个是constructor,就是构造并初始化的函数 */
#define BEGIN_CONSTRUCTOR(class, parent) \
extern int METHOD(class, constructor) (class * this); \
class* METHOD(class, create) (void) \
{ \
return common_create_object(sizeof( class ), \
(std_func_ptr) METHOD(class, constructor)); \
} \
\
int METHOD(class, constructor) (class * this) \
{ \
VTBL_ENTITY_INIT_METHOD(class) ( VTBL_ENTITY_NAME(class) ); \
if (0 != METHOD(parent, constructor) (( parent *)(this))) \
return 1; \
*(struct VTBL_STRU_NAME(class) **)this = \
(struct VTBL_STRU_NAME(class) *) VTBL_ENTITY_NAME(class) ; \
do \
/* 类构造函数的结束宏 */
#define END_CONSTRUCTOR(class, parent) \
while(0); \
return 0; \
}
/* 根类的父类构造函数为0 */
#define void_constructor(this) (0)
/* ======================================================================== */
/* ======================================================================== */
/* 类的析构函数,主要提供两个接口:
一个是destory,以支持delete,
一个是destructor,就是析构函数 */
#define BEGIN_DESTRUCTOR(class, parent) \
extern int METHOD(class, destructor) (class * this); \
void METHOD(class, destory) ( class * this) \
{ \
common_destory_object( this , \
(std_func_ptr) METHOD(class, destructor) ); \
} \
\
int METHOD(class, destructor) (class * this) \
{ \
do \
/* 类析构函数的结束宏 */
#define END_DESTRUCTOR(class, parent) \
while(0); \
if (0 != METHOD(parent, destructor) (( parent *)(this))) \
return 1; \
return 0; \
}
/* 根类的父类析构函数为0 */
#define void_destructor(this) (0)
/* ======================================================================== */
typedef int (*std_func_ptr)(void*);
typedef int (*common_func_ptr)(void*, ...);
typedef struct
{
int (*vtable_init_method)(std_func_ptr*);
std_func_ptr vtable_array;
}class_vtable_init;
void* common_create_object(unsigned int size, std_func_ptr pCtor);
void common_destory_object(void* this, std_func_ptr pDtor);
void common_destory_object_non_virtual(void* this, std_func_ptr pDtor);
/* Null类,应该为所有类的虚根 */
BEGIN_CLASS(NullClass)
{
/* 类自身的数据 */
ROOT_CLASS_DECLARE(NullClass)
/* 虚拟函数表的定义处 */
BEGIN_V_METHOD_DEFINE(NullClass)
{
/* 自身的虚函数 */
DEFINE_V_METHOD(int, destructor);
}
END_V_METHOD_DEFINE(NullClass);
}
END_CLASS(NullClass);
DEFINE_V_METHOD_INFO(int , NullClass, destructor) (NullClass* this);
/* 测试的第一个类 */
BEGIN_CLASS(TestClass)
{
/* 继承自NullClass */
INHERITED_PARENT(NullClass);
/* 虚拟函数表的定义处 */
BEGIN_V_METHOD_DEFINE(TestClass)
{
/* 继承自NullClass */
INHERITED_V_METHOD(NullClass);
/* 自身的虚函数 */
DEFINE_V_METHOD(int, open) ;
DEFINE_V_METHOD(void, close);
}
END_V_METHOD_DEFINE(TestClass);
/* 类自身的数据 */
int x_pThis;
}
END_CLASS(TestClass);
INHERITED_V_METHOD_INFO(int , TestClass, NullClass, destructor) (TestClass* this);
DEFINE_V_METHOD_INFO(int, TestClass, open) (TestClass* this, char* filename);
DEFINE_V_METHOD_INFO(void, TestClass, close) (TestClass* this, int handle);
/* 继承上一个类 */
BEGIN_CLASS(InheritClass)
{
/* TestClass */
INHERITED_PARENT(TestClass);
/* 虚拟函数表的定义处 */
BEGIN_V_METHOD_DEFINE(InheritClass)
{
/* 继承自TestClass */
INHERITED_V_METHOD(TestClass);
/* 自身的虚函数 */
DEFINE_V_METHOD(int, seek) ;
}
END_V_METHOD_DEFINE(InheritClass);
/* 类自身的数据 */
int x_nOffset;
}
END_CLASS(InheritClass);
INHERITED_V_METHOD_INFO(void, InheritClass, TestClass, destructor)(InheritClass* this);
INHERITED_V_METHOD_INFO(void, InheritClass, TestClass, close)(InheritClass* this, int handle);
DEFINE_V_METHOD_INFO(int, InheritClass, seek)(InheritClass* this, int handle, int offset);
#include "ooc.h"
#include <stdio.h>
#include <stdlib.h>
void* common_create_object(unsigned int size, std_func_ptr pCtor)
{
/* 分配对象 */
void* object = malloc(size);
/* 如果分配失败,返回0 */
if (0 == object)
return 0;
/* 调用构造函数 */
if (0 != (*pCtor)(object))
{
/* 构造函数执行失败,释放对象 */
free(object);
return 0;
}
/* 成功,返回对象 */
return object;
}
void common_destory_object(void* this, std_func_ptr pDtor)
{
/* 如果对象为空 */
if (0 == this) return;
/* 如果存在虚函数表指针 */
if (0 != *(void**)this)
{
/* 调用虚函数表中的第一个函数指针,默认此函数为析构函数 */
if (0 != (*((*(std_func_ptr**)this)[0]))((void*)this))
return;
}
else
{
/* 不为空,则调用传入的析构函数指针 */
if (0 != (*pDtor)(this))
return;
}
/* 最后释放对象 */
free(this);
}
void common_destory_object_non_virtual(void* this, std_func_ptr pDtor)
{
if (0 == this) return;
if (0 != (*pDtor)(this))
return;
/* free */
free(this);
}
BEGIN_DECLARE_CLASS_VTABLE(NullClass)
{
SELF_VTABLE_METHOD_INIT(NullClass, destructor);
}
END_DECLARE_CLASS_VTABLE(NullClass)
BEGIN_CONSTRUCTOR(NullClass, void)
{
/* do something */
printf("call NullClass_constructor\n");
}
END_CONSTRUCTOR(NullClass, void)
BEGIN_DESTRUCTOR(NullClass, void)
{
/* do something */
printf("call NullClass_destructor\n");
}
END_DESTRUCTOR(NullClass, void)
int METHOD(TestClass, open) (TestClass* this, char* filename)
{
printf("call TestClass_open\n");
return 0;
}
void METHOD(TestClass, close) (TestClass* this, int handle)
{
printf("call TestClass_close\n");
return;
}
BEGIN_DECLARE_CLASS_VTABLE(TestClass)
{
INHERITED_VTABLE_INIT(NullClass);
INHERITED_VTABLE_METHOD_INIT(TestClass, NullClass, destructor);
SELF_VTABLE_METHOD_INIT(TestClass, open);
SELF_VTABLE_METHOD_INIT(TestClass, close);
}
END_DECLARE_CLASS_VTABLE(TestClass)
BEGIN_CONSTRUCTOR(TestClass, NullClass)
{
/* do something */
printf("call TestClass_constructor\n");
this->x_pThis = 0;
}
END_CONSTRUCTOR(TestClass, NullClass)
BEGIN_DESTRUCTOR(TestClass, NullClass)
{
/* do something */
printf("call TestClass_destructor\n");
this->x_pThis = 0;
}
END_DESTRUCTOR(TestClass, NullClass)
int METHOD(InheritClass, seek) (InheritClass* this, int handle, int offset)
{
printf("call InheritClass_seek\n");
return 0;
}
void METHOD(InheritClass, close) (InheritClass* this, int handle)
{
printf("call InheritClass_close\n");
return;
}
BEGIN_DECLARE_CLASS_VTABLE(InheritClass)
{
INHERITED_VTABLE_INIT(TestClass);
INHERITED_VTABLE_METHOD_INIT(InheritClass, NullClass, destructor);
INHERITED_VTABLE_METHOD_INIT(InheritClass, TestClass, close);
SELF_VTABLE_METHOD_INIT(InheritClass, seek);
}
END_DECLARE_CLASS_VTABLE(InheritClass)
BEGIN_CONSTRUCTOR(InheritClass, TestClass)
{
/* do something */
printf("call InheritClass_constructor\n");
}
END_CONSTRUCTOR(InheritClass, TestClass)
BEGIN_DESTRUCTOR(InheritClass, TestClass)
{
/* do something */
printf("call InheritClass_destructor\n");
}
END_DESTRUCTOR(InheritClass, TestClass)
int main()
{
TestClass* pTest;
TestClass* pTest2;
pTest = new(TestClass);
//(*(((TestClass_ops*)(pTest->parent.vbtl))->open))(pTest, "");
CALL_V_METHOD(pTest, TestClass, open)(pTest, "");
//(*(((TestClass_ops*)(pTest->parent.vbtl))->close))(pTest, 1);
CALL_V_METHOD(pTest, TestClass, close)(pTest, 1);
delete(TestClass, pTest);
printf("==========================================\n");
pTest2 = new(InheritClass);
//(*(((TestClass_ops*)(pTest2->parent.vbtl))->close))(pTest2, 1);
CALL_V_METHOD(pTest2, TestClass, close)(pTest2, 1);
//or
CALL_V_METHOD(pTest2, InheritClass, close)(pTest2, 1);
delete(InheritClass, pTest2);
return 0;
}