1. 建造者模式，將一個(gè)復(fù)雜對(duì)象的構(gòu)建與它的表示分離， 使得同樣的構(gòu)建過程可以創(chuàng)建不同的表示。

用戶只需要指定需要建造的類型就可以得到他們，而具體建造的過程和細(xì)節(jié)就不需要知道了。

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關(guān)鍵類Director，用它來控制建造過程，用它來隔離用戶與建造過程的關(guān)聯(lián)。

適用場(chǎng)合主要是用于創(chuàng)建一些復(fù)雜的對(duì)象， 這些對(duì)象內(nèi)部的構(gòu)建間的建造順序通常是穩(wěn)定的，但對(duì)象內(nèi)部的構(gòu)建通常面臨著復(fù)雜的變化。

在創(chuàng)建復(fù)雜對(duì)象的算法應(yīng)該獨(dú)立于該對(duì)象的組成部分以及他們的裝配方式適用的模式。

建造者模式的好處就是使得建造代碼與表示代碼分離，由于建造者隱藏了該產(chǎn)品是如何組裝的，所以若需要改變一個(gè)產(chǎn)品的內(nèi)部表示，只需要再定義一個(gè)具體的建造者就可以了。

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實(shí)例骨架：

product.h product.cpp

#ifndef PRODUCT_H #define PRODUCT_H#include <iostream> #include <list> #include <string> using namespace std;class Product { public:Product();void addPart(string part);void show();private:list<string> *parts; };#endif // PRODUCT_H #include "product.h"Product::Product() {parts = new list<string>; }void Product::addPart(string part) {parts->push_back(part); }void Product::show() {for(list<string>::iterator i=parts->begin(); i!=parts->end(); i++)cout << "part: " << *i << endl; }

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builder.h builder.cpp

#ifndef BUILDER_H #define BUILDER_H#include "product.h"class Builder { public:Builder();void virtual builderPartA()=0;void virtual builderPartB()=0;virtual Product* getResult()=0; };#endif // BUILDER_H #include "builder.h"Builder::Builder() { }

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concretebuilder1.h concretebuilder1.cpp

#ifndef CONCRETEBUILDER1_H #define CONCRETEBUILDER1_H#include "builder.h"class ConcreteBuilder1 : public Builder { public:ConcreteBuilder1();~ConcreteBuilder1();void builderPartA();void builderPartB();Product* getResult();private:Product *product; };#endif // CONCRETEBUILDER1_H #include "concretebuilder1.h"ConcreteBuilder1::ConcreteBuilder1() {product = new Product(); }ConcreteBuilder1::~ConcreteBuilder1() {delete product; }void ConcreteBuilder1::builderPartA() {product->addPart("ConcreteBuilder1 A"); }void ConcreteBuilder1::builderPartB() {product->addPart("ConcreteBuilder1 B"); }Product* ConcreteBuilder1::getResult() {return product; }

concretebuilder2.h concretebuilder2.cpp

#ifndef CONCRETEBUILDER2_H #define CONCRETEBUILDER2_H#include "builder.h"class ConcreteBuilder2 : public Builder { public:ConcreteBuilder2();~ConcreteBuilder2();void builderPartA();void builderPartB();Product* getResult();private:Product *product; };#endif // CONCRETEBUILDER2_H #include "concretebuilder2.h"ConcreteBuilder2::ConcreteBuilder2() {product = new Product(); }ConcreteBuilder2::~ConcreteBuilder2() {delete product; }void ConcreteBuilder2::builderPartA() {product->addPart("ConcreteBuilder2 A"); }void ConcreteBuilder2::builderPartB() {product->addPart("ConcreteBuilder2 B"); }Product* ConcreteBuilder2::getResult() {return product; }

director.h director.cpp

#ifndef DIRECTOR_H #define DIRECTOR_H#include "builder.h"class Director { public:Director();void construct(Builder *builder); };#endif // DIRECTOR_H #include "director.h"Director::Director() { }void Director::construct(Builder *builder) {builder->builderPartA();builder->builderPartB(); }

main.cpp

#include <iostream> #include "product.h" #include "concretebuilder1.h" #include "concretebuilder2.h" #include "director.h"using namespace std;int main() {cout << "Builder test !" << endl;Product *product = new Product();ConcreteBuilder1 build1;Director director;director.construct(&build1);product = build1.getResult();product->show();ConcreteBuilder2 build2;director.construct(&build2);product = build2.getResult();product->show();delete product;return 0; }

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轉(zhuǎn)載于:https://www.cnblogs.com/xj626852095/p/3648192.html

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