map关联容器

/*copyright(c)2016.烟台大学计算机学院
* All rights reserved,
* 文件名称：text.Cpp
* 作者：李一波
* 完成日期：2016年6月16日
* 版本号：codeblocks
*
* 问题描述:
* 输入描述:
* 程序输出：
*/
#include <algorithm>
#include<map>
#include<iterator>
#include<iostream>
#include<cstring>
using namespace std;
struct ltstr
{
bool operator()(const char* s1, const char* s2) const
{
return strcmp(s1, s2) < 0;
}
};

int main()
{
map<const char*, int, ltstr> months;

months["january"] = 31;
months["february"] = 28;
months["march"] = 31;
months["april"] = 30;
months["may"] = 31;
months["june"] = 30;
months["july"] = 31;
months["august"] = 31;
months["september"] = 30;
months["october"] = 31;
months["november"] = 30;
months["december"] = 31;

cout << "june -> " << months["june"] << endl;
map<const char*, int, ltstr>::iterator cur  = months.find("june");
map<const char*, int, ltstr>::iterator prev = cur;
map<const char*, int, ltstr>::iterator next = cur;
++next;
--prev;
cout << "Previous (in alphabetical order) is " << (*prev).first << endl;
cout << "Next (in alphabetical order) is " << (*next).first << endl;
return 0;
}