c: Visitor Pattern in windows 10

 

/**
 * @file validator.h
 * @author your name (you@domain.com)
 * @brief  访问者模式 Visitor Pattern   来源： C现代编程 集成开发环境、设计模式、极限编程、测试驱动开发、重构、持续集成  日.花井志生著，杨文轩译，人民邮电出版社
 * @version 0.1
 * @date 2023-10-21
 * 
 * @copyright Copyright (c) 2023
 * 
 */

#ifndef _VALIDATOR_H_
#define _VALIDATOR_H_

#include <stddef.h>
#include <stdbool.h>

#ifdef __cplusplus
extern "C" {
#endif


/**
 * @brief 
 * 
 */
struct ValidatorVisitor;


/**
 * @brief 
 * 
 */
typedef struct Validator {
    bool (* const validate)(struct Validator *pThis, int val);
    void (* const accept)(struct Validator *pThis, struct ValidatorVisitor *pVisitor);
} Validator;

/**
 * @brief 
 * 
 */
typedef struct {
    Validator base;
    const int min;
    const int max;
} RangeValidator;


/**
 * @brief 
 * 
 */
typedef struct {
    Validator base;
    int previousValue;
} PreviousValueValidator;


/**
 * @brief 
 * 
 */
typedef struct ValidatorVisitor {
    void (* const visitRange)(struct ValidatorVisitor *pThis, RangeValidator *p);
    void (* const visitPreviousValue)(struct ValidatorVisitor *pThis, PreviousValueValidator *p);
} ValidatorVisitor;

/**
 * @brief 
 * 
 * @param pThis 
 * @param pVisitor 
 */
void acceptRange(Validator *pThis, ValidatorVisitor *pVisitor);

/**
 * @brief 
 * 
 * @param pThis 
 * @param pVisitor 
 */
void acceptPrevious(Validator *pThis, ValidatorVisitor *pVisitor);

/**
 * @brief 
 * 
 * @param pThis 
 * @param val 
 * @return true 
 * @return false 
 */
bool validateRange(Validator *pThis, int val);

/**
 * @brief 
 * 
 * @param pThis 
 * @param val 
 * @return true 
 * @return false 
 */
bool validatePrevious(Validator *pThis, int val);

/**
 * @brief 
 * 
 */
#define newRangeValidator(min, max) \
    {{validateRange, acceptRange}, (min), (max)}



/**
 * @brief 
 * 
 */
#define newPreviousValueValidator \
    {{validatePrevious, acceptPrevious}, 0}

#ifdef __cplusplus
}
#endif

#endif

　　

/**
 * @file validator.c
 * @author your name (you@domain.com)
 * @brief 访问者模式 Visitor Pattern  来源： C现代编程 集成开发环境、设计模式、极限编程、测试驱动开发、重构、持续集成  日.花井志生著，杨文轩译，人民邮电出版社
 * @version 0.1
 * @date 2023-10-21
 * 
 * @copyright Copyright (c) 2023
 * 
 */

#include <stdbool.h>
#include <stdio.h>
#include "include/validator.h"

/**
 * @brief 
 * 
 * @param p 
 * @param val 
 * @return true 
 * @return false 
 */
bool validateRange(Validator *p, int val) {
    RangeValidator *pThis = (RangeValidator *)p;
    return pThis->min <= val && val <= pThis->max;
}

/**
 * @brief 
 * 
 * @param p 
 * @param val 
 * @return true 
 * @return false 
 */
bool validatePrevious(Validator *p, int val) {
    PreviousValueValidator *pThis = (PreviousValueValidator *)p;
    if (val < pThis->previousValue) return false;
    pThis->previousValue = val;
    return true;
}

/**
 * @brief 
 * 
 * @param p 
 * @param pVisitor 
 */
void acceptRange(Validator *p, ValidatorVisitor *pVisitor) {
    pVisitor->visitRange(pVisitor, (RangeValidator *)p);
}

/**
 * @brief 
 * 
 * @param p 
 * @param pVisitor 
 */
void acceptPrevious(Validator *p, ValidatorVisitor *pVisitor) {
    pVisitor->visitPreviousValue(pVisitor, (PreviousValueValidator *)p);
}

　　

/**
 * @file validatorView.h
 * @author your name (you@domain.com)
 * @brief 访问者模式 Visitor Pattern 来源： C现代编程 集成开发环境、设计模式、极限编程、测试驱动开发、重构、持续集成  日.花井志生著，杨文轩译，人民邮电出版社
 * @version 0.1
 * @date 2023-10-21
 * 
 * @copyright Copyright (c) 2023
 * 
 */

#ifndef _VALIDATORVIEW_H_
#define _VALIDATORVIEW_H_

#include <stddef.h>
#include <stdbool.h>
#include <stdlib.h>
#include "validator.h"


#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief 
 * 
 * @param p 
 * @param pBuf 
 * @param size 
 */
void printValidator(const Validator *p, char *pBuf, size_t size);

#ifdef __cplusplus
}
#endif

#endif

　　

 

/**
 * @file validatorView.c
 * @author your name (you@domain.com)
 * @brief 访问察者模式 Visitor Pattern 来源： C现代编程 集成开发环境、设计模式、极限编程、测试驱动开发、重构、持续集成  日.花井志生著，杨文轩译，人民邮电出版社
 * @version 0.1
 * @date 2023-10-21
 * 
 * @copyright Copyright (c) 2023
 * 
 */

#include <stdio.h>
#include "include/validator.h"

/**
 * @brief 
 * 
 * @param pThis 
 * @param p 
 */
static void rangeView(ValidatorVisitor *pThis, RangeValidator *p);

/**
 * @brief 
 * 
 * @param pThis 
 * @param p 
 */
static void previousValueView(ValidatorVisitor *pThis, PreviousValueValidator *p);


/**
 * @brief 
 * 
 */
typedef struct ViewVisitor {
    ValidatorVisitor base;
    char *pBuf;
    size_t size;
} ViewVisitor;


/**
 * @brief 
 * 
 * @param p 
 * @param pBuf 
 * @param size 
 */
void printValidator(Validator *p, char *pBuf, size_t size) {
    ViewVisitor visitor = {{rangeView, previousValueView}, pBuf, size};
    p->accept(p, &visitor.base);
}

/**
 * @brief 
 * 
 * @param pThis 
 * @param p 
 */
static void rangeView(ValidatorVisitor *pThis, RangeValidator *p) {
    ViewVisitor *pVisitor = (ViewVisitor* )pThis;
    snprintf(pVisitor->pBuf, pVisitor->size, "Range(%d-%d)", p->min, p->max);
}

/**
 * @brief 
 * 
 * @param pThis 
 * @param p 
 */
static void previousValueView(ValidatorVisitor *pThis, PreviousValueValidator *p) {
    ViewVisitor *pVisitor = (ViewVisitor* )pThis;
    snprintf(pVisitor->pBuf, pVisitor->size, "Previous");
}

　　

调用：

 

#include "include/validator.h"
#include "include/validatorView.h"

 
int main()
{
    printf("hello c world, \n");
    printf("你好，中国\n");

    RangeValidator v = newRangeValidator(0, 9);
    char buf[32];
    printValidator(&v.base, buf, sizeof(buf));
    strcmp("Range(0-9)", buf);
    printf("访问者模式1: %s\n",buf);

    PreviousValueValidator v2 = newPreviousValueValidator;
    char buf2[32];
    printValidator(&v2.base, buf2, sizeof(buf2));
    strcmp("Previous", buf2);
    printf("访问者模式1: %s\n",buf2);
    
    return 0;

}