Map和MultiMap使用

最新推荐文章于 2025-08-30 15:00:23 发布

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本文通过C++代码示例介绍了标准模板库中Map和MultiMap的使用方法，包括元素的插入、查找及遍历等操作。

#pragma once

class TestMap
{
public:
TestMap(void);
virtual ~TestMap(void);
void test();
void test1();
};

class TestMultiMap
{
public:
TestMultiMap(void);
virtual ~TestMultiMap(void);
void test();
};

//---------------------------------------------------------

#include "TestMap_TestMultiMap.h"
#include <map>
#include <iostream>
#include <string>

using namespace std;

TestMap::TestMap(void)
{
}

TestMap::~TestMap(void)
{
}

void TestMap::test()
{
map<int,string> coll;
coll.insert(make_pair(5,"tagged"));
coll.insert(make_pair(2,"a"));
coll.insert(make_pair(1,"this"));
coll.insert(make_pair(4,"of"));
coll.insert(make_pair(6,"strings"));
std::pair<map<int, string>::iterator, bool> retInsert; //------------------- 判断插入结果
retInsert = coll.insert(make_pair(1,"is"));
if( !retInsert.second)
cout<<"Failed in insert (1,\"is\")\n";
coll.insert(make_pair(3,"multimap"));
map<int,string>::const_iterator pos;
for( pos = coll.begin(); pos != coll.end(); ++pos)
{
cout<<pos->second<<' ';
}
cout<<endl;
}

void TestMap::test1()
{
map<string,float> coll;
coll["VAT"] = 0.15;
coll["Pi"] = 3.14159;
coll["an arbitrary number"] = 4983.223;
coll["NULL"] = 0;

map<string,float>::const_iterator pos;
for( pos = coll.begin(); pos != coll.end(); ++pos)
{
cout<<"("<<pos->first<<","<<pos->second<<") ";
}
cout<<endl;
}

TestMultiMap::TestMultiMap(void)
{
}

TestMultiMap::~TestMultiMap(void)
{
}

void TestMultiMap::test()
{
multimap<int,string> coll;
coll.insert(make_pair(5,"tagged"));
coll.insert(make_pair(2,"a"));
coll.insert(make_pair(1,"this"));
coll.insert(make_pair(4,"of"));
coll.insert(make_pair(6,"strings"));
coll.insert(make_pair(1,"is"));
coll.insert(make_pair(3,"multimap"));
multimap<int,string>::const_iterator pos;
for( pos = coll.begin(); pos != coll.end(); ++pos)
{
cout<<pos->second<<' ';
}
cout<<endl;
}