• c++ list sort


      1.    bool operator < (S & b) {
           return ID < b.ID;
          }

    struct S {
             std::string firstname;
             std::string secondname;
             int ID;
          bool operator < (S & b) {
           return ID < b.ID;
          }
     // 重新定义小于,因为默认的sort函数调用的操作符是<,所以我们只需要重载 < 就好了
    };
    
    int main(int argc, char* argv[])
    {
     
     std::list<S> mylist;
     
     std::list<S>::iterator iter;
     
     S a;
     
     a.firstname ="dfadf";
     
     a.ID = 5;
     
     mylist.push_back (a);
     
     
     
     a.firstname ="得到";
     
     a.ID = 9;
     
     mylist.push_back (a);
     
     
     
     a.firstname ="xxx";
     
     a.ID = 7;
     
     mylist.push_back (a);
     
     
     
     a.firstname ="gggg";
     
     a.ID = 25;
     
     mylist.push_back (a);
     
     
     
     mylist.sort();

    2.

    
    #include "stdafx.h"
    #include <iostream> 
    #include <list>
    using namespace std;
     
    class A{
    public:
        A(int m):a(m){}
        bool operator <(const A& other)
        {
        <span style="font-size: 18px;">    return a < other.a;</span>
        }
        friend std::ostream& operator <<(std::ostream& out, const A& obj){
            out<< obj.a<<endl;
            return out;
        }
    private:
        int a;
    };
     
     
    int _tmain(int argc, _TCHAR* argv[])
    {  
       list<A> S;
       typedef list<A>::iterator it;
       S.push_back(A(3));
       S.push_back(A(2));
       S.push_back(A(5));
       S.sort();
        it it1 = S.begin();
        it it2 = S.end();
        while(it1 != it2)
        {
            cout<<*it1<<endl;
            it1++;
        }
        return 0;
    }

    3.

    33 // list_sort.cpp
    34 // compile with: /EHsc
    35 #include <list>
    36 #include <iostream>
    37  
    38 int main( )
    39 {
    40    using namespace std;
    41    list <int> c1;
    42    list <int>::iterator c1_Iter;
    43     
    44    c1.push_back( 20 );
    45    c1.push_back( 10 );
    46    c1.push_back( 30 );
    47  
    48    cout << "Before sorting: c1 =";
    49    for ( c1_Iter = c1.begin( ); c1_Iter != c1.end( ); c1_Iter++ )
    50       cout << " " << *c1_Iter;
    51    cout << endl;
    52  
    53    c1.sort( );
    54    cout << "After sorting c1 =";
    55    for ( c1_Iter = c1.begin( ); c1_Iter != c1.end( ); c1_Iter++ )
    56       cout << " " << *c1_Iter;
    57    cout << endl;
    58  
    59    c1.sort( greater<int>( ) );
    60    cout << "After sorting with 'greater than' operation, c1 =";
    61    for ( c1_Iter = c1.begin( ); c1_Iter != c1.end( ); c1_Iter++ )
    62       cout << " " << *c1_Iter;
    63    cout << endl;
    64 }
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  • 原文地址:https://www.cnblogs.com/yelongsan/p/4050026.html
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