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  • STL与泛型编程-练习2-GeekBand

    练习题目:
    3
    4

    
    
    
    struct Programmer{
        Programmer(const int id, const std::wstring name):
             Id(id), Name(name){  }
    
        void Print() const 
        {
            std::wcout<<L"["<<Id<<L"]: "<<Name<<std::endl;
        }
    
        int Id;
        std::wstring Name;
    };
    
    
    
    //2, 定义仿函数
    
    //a, 使用ID升序排序
    struct ProgrammerIdGreater : public std::binary_function< Programmer, Programmer, bool>{
        bool operator() (const Programmer& p1, const Programmer& p2) const {
        return (key1 <= key2) ? false : true;
        }
    };
    
    //b, 使用Name来进行排序
    struct ProgrammerNameComparer : public std::binary_function< Programmer, Programmer, bool>{
        bool operator() (const Programmer& p1, const Programmer& p2) const {
        return (p1.GetId() <= p2.GetId()) ? false : true;
        }
    };
    
    
    void main()
    {
    
        //构建数组
        Programmer vp[6] = {
            Programmer("Andrei", 6),
            Programmer("Stanley", 5),
            Programmer("Plaught", 4),
            Programmer("BillGates", 3),
            Programmer("Fowler", 2),
            Programmer("Meyes", 1)
        };
        //构建set
        std::set<Programmer, ProgrammerIdGreater > dest(vp, vp+6);
    
        //遍历set
        std::for_each( dest.begin(), dest.end(), std::mem_fun(&Programmer::Print) );
    
        //将dest中的BillGates改为David
        std::set<Programmer, ProgrammerIdGreater>::iterator it = dest.find(Programmer("BillGates", 3));
        if(it != dest.end())
            const_cast<Programmer&>(*it).SetName("David");
    
        //遍历set
        std::for_each( dest.begin(), dest.end(), std::mem_fun(&Programmer::Print) );
    
        //新set2用名字排序
        std::set<Programmer, ProgrammerNameComparer > dest2(dest, dest+6);
    
        //遍历set2
        std::for_each( dest2.begin(), dest2.end(), std::mem_fun(&Programmer::Print) );
    
    
    }
    
    
    
    
    
    
    
    
    
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  • 原文地址:https://www.cnblogs.com/skyhuangdan/p/5486760.html
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