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  • set-end

    ////////////////////////////////////////
    //      2018/04/28 13:53:14
    //      set-end
    
    // returns an iterator to the last element
    #include <iostream>
    #include <set>
    #include <iomanip>
    #include <string>
    
    using namespace std;
    
    template<class T>
    class Member{
    private:
        T first, last;
    public:
        Member(T f, T l) :first(f), last(l){}
        void print() const   // const!!!
        {
            cout.setf(ios::left);
            cout << setw(15) << first << " " << last << endl;
        }
    
        friend bool operator <(const Member& m1, const Member& m2){
            return m1.last < m2.last;
        }
    
        friend bool operator == (const Member& m1, const Member& m2){
            return m1.last == m2.last;
        }
    };
    
    //==================================
    
    int main(){
        typedef Member<string> M;
        typedef set<M, less<M>> S;
    
        M m("Forst", "Robert");
        S s;
    
        s.insert(m);
        s.insert(M("Smith","John"));
        s.insert(M("Amstrong", "Bill"));
        s.insert(M("Bain","Linda"));
    
        S::iterator it = s.begin();
        while ( it != s.end())
        {
            (it++)->print();
        }
        return 0;
    }
    
    /*
    OUTPUT:
        Amstrong        Bill
        Smith           John
        Bain            Linda
        Forst           Robert
    */
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  • 原文地址:https://www.cnblogs.com/laohaozi/p/12537913.html
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