如何使工厂设计模式在C 中

在学习C 中的OOP的目标中，我想创建一个使用工厂设计模式的工具程序。

，但我不知道我必须如何发展。但是我已经尝试开发它，但它行不通。

您在下面找到了我为创建工具权限制作的所有代码，并且可以使用向量创建工具箱。

我希望在我的问题中清楚。

类：

handyman.hpp：

#ifndef BRICOLEUR_HPP
#define BRICOLEUR_HPP
#include <ScrewDriver.hpp>
#include <Saw.hpp>
#include <Hammer.hpp>
#include <string>
class Handyman
{
    public:
        void screw(ScrewDriver t){t.screw();}
        void cut(Saw s){s.cut();}
        void crack(Hammer m){m.crack();}
};
#endif

Hammer.hpp：

#ifndef MARTEAU_HPP
#define MARTEAU_HPP
#include <iostream>
#include <Tool.hpp>
#include <ToolBreak.hpp>
class Hammer : public Tool, ToolBreak
{
    std::string nom;
    public:
        Hammer(std::string const & nom){this->nom = nom;}
        std::string get_nom(){return this->nom;}
        void crack(){std::cout << "Hammer crack" << std::endl;}
        ~Hammer();
};
#endif

saw.hpp：

....
#include <ToolCutting.hpp>
class Saw : public Tool, ToolCutting
{
    ....
    public:
        ....
        void cut(){std::cout << "Saw cut" << std::endl;}
        ....
};
#endif

螺丝驾驶员：hpp：

....
#include <ToolScrewing.hpp>
class ScrewDriver : public Tool, ToolScrewing
{
    ....
    public:
        ....
        void screw(){std::cout << "ScrewDriver screw" << std::endl;}
        ....
};
#endif

接口

工具break.hpp

#ifndef TOOLBREAK_HPP
#define TOOLBREAK_HPP
#include <string>
class ToolBreak
{
    public:
        virtual std::string get_nom() = 0;
        virtual void crack() = 0;
};
#endif

接口的相同模型：

• toolcutting.hpp
• toolscrewing.hpp

工厂

toolfactory.hpp

#ifndef TOOLFACTORY_HPP
#define TOOLFACTORY_HPP
#include <memory>
#include <Tool.hpp>
#include <ScrewDriver.hpp>
#include <Hammer.hpp>
#include <Saw.hpp>
class ToolFactory
{
    public:
        static Tool create (std::string name, std::string arg);
};
#endif

toolfactory.cpp

#include <ToolFactory.hpp>
Tool ToolFactory::create(std::string name, std::string args)
{
    if(name.compare("Screwdriver") == 0)
    {
        return ScrewDriver(args);
    }
    else if(name.compare("Hammer") == 0)
    {
        return Hammer(args);
    }
    else if(name.compare("Saw") == 0)
    {
        return Saw(args);
    }
    else
    {
        std::cout << "Error ! Tool not found" << std::endl;
    }
}

main.cpp

#include <vector>
#include <Handyman.hpp>
#include <ToolFactory.hpp>
using namespace std;
int main()
{
    Handyman handy;
    ScrewDriver screwdriver("Blue screwdriver");
    Saw saw("Green saw");
    Hammer hammer("Yellow hammer");
    handy.screw(screwdriver);
    handy.cut(saw);
    handy.crack(hammer);
    Tool screwdriverV2 = ToolFactory::create("Screwdriver", "Screwdriver v2");
    screwdriverV2.display();
    return 0;
}

输出

clang++ -Wall -std=c++14 -c -o obj/main.o src/main.cpp -I include
clang++ -Wall -std=c++14 -c -o obj/Handyman.o src/Handyman.cpp -I include
clang++ -Wall -std=c++14 -c -o obj/Saw.o src/Saw.cpp -I include
clang++ -Wall -std=c++14 -c -o obj/ScrewDriver.o src/ScrewDriver.cpp -I include
clang++ -Wall -std=c++14 -c -o obj/Hammer.o src/Hammer.cpp -I include
clang++ -Wall -std=c++14 -c -o obj/Tool.o src/Tool.cpp -I include
clang++ -Wall -std=c++14 -c -o obj/ToolScrewing.o src/ToolScrewing.cpp -I include
clang++ -Wall -std=c++14 -c -o obj/ToolBreak.o src/ToolBreak.cpp -I include
clang++ -Wall -std=c++14 -c -o obj/ToolCutting.o src/ToolCutting.cpp -I include
clang++ -Wall -std=c++14 -c -o obj/ToolFactory.o src/ToolFactory.cpp -I include
src/ToolFactory.cpp:21:1: warning: control may reach end of non-void function [-Wreturn-type]
}
^
1 warning generated.
clang++ -Wall -std=c++14 -o bin/main obj/main.o obj/Handyman.o obj/Saw.o obj/ScrewDriver.o obj/Hammer.o obj/Tool.o obj/ToolScrewing.o obj/ToolBreak.o obj/ToolCutting.o obj/ToolFactory.o
./bin/main
ScrewDriver screw
Saw cut
Hammer crack
It's a tool

class ToolFactory
{
    public:
        static std::unique_ptr<Tool> create (std::string name, std::string arg);
};
std::unique_ptr<Tool> ToolFactory::create(std::string name, std::string args)
{
    if(name.compare("Screwdriver") == 0)
    {
        return std::make_unique<ScrewDriver>(args);
    }
    // note as your if has return statement you do not really need else
    ...
}

class ToolFactory
{
        using Creator  = std::function<std::unique_ptr<Tool>(std::string)>
        using Creators = std::unordered_map<std::string,Creator>;
        Creators m_creators;
    public:
        ToolFactory();
        std::unique_ptr<Tool> create (std::string name, std::string arg);
};
ToolFactory::ToolFactory()
{
     m_creators[ "Screwdriver" ] = []( std::string arg ) { return std::make_unique<ScrewDriver>(arg); }
     ...
}
std::unique_ptr<Tool> ToolFactory::create (std::string name, std::string arg)
{
    auto f = m_creators.find( name );
    if( f == m_creators.end() ) 
       throw std::runtime_error( "unknown type:" + name );
    return f->second( arg );
}