lw_oopc.h文件注释

lw_oopc.h是一个基于C语言实现的简单的面向对象编程库，以下是该文件的注释：

/*
 * lw_oopc.h
 *
 * A simple implementation of Object-Oriented Programming in C
 * by Liang Weihan (liangweihan0426@gmail.com)
 *
 * This library provides a way to define classes and create objects in C,
 * using a structure to represent the object and function pointers to
 * represent methods.
 *
 * Usage:
 * #include "lw_oopc.h"
 *
 * // Define a class
 * class_def(MyClass) {
 *     // private variables
 *     int x;
 *
 *     // public methods
 *     int (*get_x)(MyClass *self);
 *     void (*set_x)(MyClass *self, int x);
 * };
 *
 * // Implement the methods
 * impl(MyClass, get_x) {
 *     return self->x;
 * }
 *
 * impl(MyClass, set_x) {
 *     self->x = x;
 * }
 *
 * // Create an object
 * MyClass *obj = new(MyClass);
 *
 * // Call the methods
 * obj->set_x(obj, 42);
 * printf("%d\n", obj->get_x(obj));
 *
 * // Destroy the object
 * delete(obj);
 *
 */

#ifndef LW_OOPC_H_
#define LW_OOPC_H_

// Class definition macro
#define class_def(classname) \
    typedef struct classname classname; \
    struct classname

// Method implementation macro
#define impl(classname, methodname) \
    int (*methodname)(classname *self)

// Constructor macro
#define new(classname) \
    ({ \
        classname *self = (classname *) malloc(sizeof(classname)); \
        memset(self, 0, sizeof(classname)); \
        self; \
    })

// Destructor macro
#define delete(obj) \
    ({ \
        free(obj); \
    })

#endif /* LW_OOPC_H_ */

该文件实现了一个简单的面向对象编程框架，使用结构体来表示对象，使用函数指针来表示方法。通过class_def宏来定义类，impl宏来实现方法，new宏来创建对象，delete宏来销毁对象。