建造者模式(大话设计模式)C/C++版本

建造者模式

在这里插入图片描述

C++

参考：https://www.cnblogs.com/Galesaur-wcy/p/15907863.html

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;// Product Class，产品类，由多个部件组成。
class Product
{
private:vector<string> parts;public:// 添加产品部件void Add(string part){parts.push_back(part);}// 显示所有的产品部件void Show(){std::cout << "产品  创建" << std::endl;for_each(parts.cbegin(), parts.cend(), [](const string &s){ cout << s << " "; });cout << endl;}
};// Builder，抽象建造者,并声明一个得到产品建造后结果的方法GetResult。
class Builder
{
public:virtual ~Builder() = default;virtual void BuildPartA() = 0;virtual void BuildPartB() = 0;virtual Product *GetResult() = 0;
};// ConcreteBuilder1,具体建造者类,实现Builder接口中的具体方法。
class ConcreteBuilder1 : public Builder
{
private:Product *product = new Product;public:void BuildPartA() override{product->Add("部件A");}void BuildPartB() override{product->Add("部件B");}Product *GetResult() override{return product;}
};// ConcreteBuilder2,具体建造者类,实现Builder接口中的具体方法。
class ConcreteBuilder2 : public Builder
{
private:Product *product = new Product;public:void BuildPartA() override{product->Add("部件X");}void BuildPartB() override{product->Add("部件Y");}Product *GetResult() override{return product;}
};class Director //  指挥者类，指挥建造Product的过程（控制构建各部分组件的顺序）。
{
public:void Construct(Builder *const b){b->BuildPartA();b->BuildPartB();}
};int main()
{// 用户并不需要知道具体的建造过程，只需指定建造 Product 具体类型。Director director;Builder *b1 = new ConcreteBuilder1;Builder *b2 = new ConcreteBuilder2;cout << "用ConcreteBuilder1的方法建造产品: " << endl;director.Construct(b1);Product *p1 = b1->GetResult();p1->Show();cout << endl;cout << "用ConcreteBuilder2的方法建造产品: " << endl;director.Construct(b2);Product *p2 = b2->GetResult();p2->Show();cout << endl;delete p2;delete p1;delete b1;delete b2;p2 = p1 = nullptr;b1 = b2 = nullptr;return 0;
}

C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>// 产品部件
typedef struct Product
{char **parts;size_t parts_count;
} Product;// 构建者接口
typedef struct Builder
{void (*build_part_a)(Product *);void (*build_part_b)(Product *);Product *(*get_result)(void *);
} Builder;// 具体构建者基类，用于存储产品实例
typedef struct ConcreteBuilder
{Product product;
} ConcreteBuilder;// 导演类
typedef struct Director
{void (*construct)(struct Director *, Builder *, void *, Product **);
} Director;// 初始化产品
void init_product(Product *product)
{product->parts = NULL;product->parts_count = 0;
}// 释放产品
void free_product(Product *product)
{if (product->parts != NULL){int i;for (i = 0; i < product->parts_count; ++i){free(product->parts[i]);}free(product->parts);}
}// 添加部件到产品
void add_part(Product *product, const char *part)
{product->parts = (char **)realloc(product->parts, sizeof(char *) * (product->parts_count + 1));product->parts[product->parts_count++] = strdup(part);
}// 展示产品部件
void show_product(Product *product)
{printf("产品    创建:\n");int i;for (i = 0; i < product->parts_count; ++i){printf("%s ", product->parts[i]);}printf("\n");
}// 实现ConcreteBuilder1的构建方法
void build_part_a_concrete_builder1(Product *product)
{add_part(product, "部件A");
}void build_part_b_concrete_builder1(Product *product)
{add_part(product, "部件B");
}// 实现ConcreteBuilder2的构建方法
void build_part_a_concrete_builder2(Product *product)
{add_part(product, "部件X");
}void build_part_b_concrete_builder2(Product *product)
{add_part(product, "部件Y");
}// 获取结果的通用实现，确保安全返回产品实例
Product *get_result_common(void *builder_void_ptr)
{ConcreteBuilder *builder = (ConcreteBuilder *)builder_void_ptr;return &builder->product;
}// 导演类构建方法
void construct(Director *director, Builder *builder, void *builder_void_ptr, Product **result)
{builder->build_part_a((Product *)builder_void_ptr);builder->build_part_b((Product *)builder_void_ptr);*result = builder->get_result(builder_void_ptr);
}int main()
{// 初始化DirectorDirector director = {.construct = construct};// 初始化ConcreteBuilder实例ConcreteBuilder builder1;init_product(&builder1.product);Builder b1 = {.build_part_a = build_part_a_concrete_builder1,.build_part_b = build_part_b_concrete_builder1,.get_result = get_result_common};ConcreteBuilder builder2;init_product(&builder2.product);Builder b2 = {.build_part_a = build_part_a_concrete_builder2,.build_part_b = build_part_b_concrete_builder2,.get_result = get_result_common};Product *p1 = NULL;Product *p2 = NULL;printf("使用ConcreteBuilder1的方法建造产品: \n");director.construct(&director, &b1, &builder1, &p1);show_product(p1);puts("");printf("使用ConcreteBuilder2的方法建造产品: \n");director.construct(&director, &b2, &builder2, &p2);show_product(p2);puts("");free_product(p1);free_product(p2);return 0;
}