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

using namespace std;

int main( )
{
    map m1, m2, m3;
    map ::iterator m1_Iter;

    m1.insert ( pair   ( 1, 10 ) );
    m1.insert ( pair   ( 2, 20 ) );
    m1.insert ( pair   ( 3, 30 ) );
    m2.insert ( pair   ( 10, 100 ) );
    m2.insert ( pair   ( 20, 200 ) );
    m3.insert ( pair   ( 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