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Copy pathhashmap.cpp
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47 lines (47 loc) · 1.22 KB
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/**
*\author peakflys
*\brief 演示hash_map键值更改造成的问题
*/
#include <iostream>
#include <ext/hash_map>
struct Unit
{
char name[32];
unsigned int score;
Unit(const char *_name,const unsigned int _score) : score(_score)
{
strncpy(name,_name,32);
}
};
int main()
{
typedef __gnu_cxx::hash_map<char*,Unit*> uHMap;
typedef uHMap::value_type hmType;
typedef uHMap::iterator hmIter;
uHMap hMap;
Unit *unit1 = new Unit("peak",100);
Unit *unit2 = new Unit("Joey",20);
Unit *unit3 = new Unit("Rachel",40);
Unit *unit4 = new Unit("Monica",90);
hMap[unit1->name] = unit1;
hMap[unit2->name] = unit2;
hMap.insert(hmType(unit3->name,unit3));
hMap.insert(hmType(unit4->name,unit4));
for(hmIter it=hMap.begin();it!=hMap.end();++it)
{
std::cout<<it->first<<"\t"<<it->second->score<<std::endl;//正常操作
}
hmIter it = hMap.begin();
strncpy(it->first,"cc",32);//强行更改
for(hmIter it=hMap.begin();it!=hMap.end();++it)
{
std::cout<<it->first<<"\t"<<it->second->score<<std::endl;//死循环，原因参加上面++操作说明
}
for(hmIter it=hMap.begin();it!=hMap.end();++it)
{
Unit *unit = it->second;
hMap.erase(it++);
delete unit; //因为死循环，造成多次delete多次而宕机
}
return 0;
}