阅读程序（5）


*Copyright (c) 2014,烟台大学计算机学院

*All right reserved.

*文件名称：test.cpp

*作    者：韩双志

*完成日期：2016年6月20日

*版本号：v1.0

*

*问题描述：map函数

*输入描述：无

*输出描述：输出相关内容

/*

#include <map>

#include <iostream>

using namespace std;

int main( )

{

    map <int, int> m1, m2, m3;

    map <int, int>::iterator m1_Iter;

    m1.insert ( pair <int, int>  ( 1, 10 ) );

    m1.insert ( pair <int, int>  ( 2, 20 ) );

    m1.insert ( pair <int, int>  ( 3, 30 ) );

    m2.insert ( pair <int, int>  ( 10, 100 ) );

    m2.insert ( pair <int, int>  ( 20, 200 ) );

    m3.insert ( pair <int, int>  ( 30, 300 ) );

    cout << "The original map m1 is:";

    for ( m1_Iter = m1.begin( ); m1_Iter != m1.end( ); m1_Iter++ )

        cout << " " << m1_Iter->second;

    cout   << "." << endl;

    // This is the member function version of swap

    //m2 is said to be the argument map; m1 the target map

    m1.swap( m2 );

    cout << "After swapping with m2, map m1 is:";

    for ( m1_Iter = m1.begin( ); m1_Iter != m1.end( ); m1_Iter++ )

        cout << " " << m1_Iter -> second;

    cout  << "." << endl;

    cout << "After swapping with m2, map m2 is:";

    for ( m1_Iter = m2.begin( ); m1_Iter != m2.end( ); m1_Iter++ )

        cout << " " << m1_Iter -> second;

    cout  << "." << endl;

    // This is the specialized template version of swap

    swap( m1, m3 );

    cout << "After swapping with m3, map m1 is:";

    for ( m1_Iter = m1.begin( ); m1_Iter != m1.end( ); m1_Iter++ )

        cout << " " << m1_Iter -> second;

    cout   << "." << endl;

    return 0;

}

*/

运行结果



知识点总结

aList.map(processFunc)//就这么简单，aList中的每一个元素将会变成processFunc的返回值。 这个processFunc一般都是匿名函数，因为用过一次后就用不到了。

学习心得

   无