设计模式DP-外观模式

示例一

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
// 定义子系统A
typedef struct subsystemA {
	void (*operationA)(struct subsystemA* subsystem);
} SubsystemA;
// 定义子系统B
typedef struct subsystemB {
	void (*operationB)(struct subsystemB* subsystem);
} SubsystemB;
// 定义子系统C
typedef struct subsystemC {
	void (*operationC)(struct subsystemC* subsystem);
} SubsystemC;
// 定义外观
typedef struct facade {
	SubsystemA subsystemA;
	SubsystemB subsystemB;
	SubsystemC subsystemC;
	void (*operation)(struct facade* facade);
} Facade;
// 实现子系统A的操作
void operationA(SubsystemA* subsystem) {
	printf("SubsystemA operation.\n");
}
// 实现子系统B的操作
void operationB(SubsystemB* subsystem) {
	printf("SubsystemB operation.\n");
}
// 实现子系统C的操作
void operationC(SubsystemC* subsystem) {
	printf("SubsystemC operation.\n");
}
// 实现外观的操作
void operation(Facade* facade) {
	facade->subsystemA.operationA(&facade->subsystemA);
	facade->subsystemB.operationB(&facade->subsystemB);
	facade->subsystemC.operationC(&facade->subsystemC);
}
 
int main(int argc, char *argv[])
{
	Facade facade;
	facade.subsystemA.operationA = operationA;
	facade.subsystemB.operationB = operationB;
	facade.subsystemC.operationC = operationC;
	facade.operation = operation;
	facade.operation(&facade);
	return 0;
}

示例二

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
typedef struct _Computer {
	void ( *work )( void );
} Computer;
void work( void )
{
	printf( "Computer work here!\n" );
}
 
typedef struct _Phone {
	void ( *contact )( void );
} Phone;
void contact( void )
{
	printf( "Phone contact here!\n" );
}
 
typedef struct _Factory {
	Computer *computer;
	Phone *phone;
	void ( *create )( struct _Factory *factory );
} Factory;
void create( Factory *factory )
{
	//assert( NULL != factory );
	factory->computer->work();
	factory->phone->contact();
}
 
int main(int argc, char *argv[])
{
	Computer computer = {
		.work = work,
	};
	
	Phone phone = {
		.contact = contact,
	};
 
	Factory factory = {
		.create = create,
		.computer = &computer,
		.phone = &phone,
	};
	
	factory.create( &factory );
 
	return 0;
}

• ()[https://zhuanlan.zhihu.com/p/637760241]
• ()[https://blog.csdn.net/lbaihao/article/details/117820088]
• ()[https://blog.csdn.net/feixiaoxing/article/details/7100334]