我有三个类来表示数据库数据。一个UserRow一个HobbyRow和一个UserAndHobbyRow合并UserRow，其中包含一个HobbyRow，但地图为X new。我得到UserRow，然后我得到X HobbyRows并将其添加到UserAndHobbyRow中的地图。我可以把它打印出来。但是当我去释放地图数据时，我收到了内存错误。
请注意，这是一个用于说明问题的小型模型。建议不使用#include <iostream>
#include <sstream>
#include <map>
#include <string>
class UserRow {
public:
unsigned int id;
std::string name;
void Print();
UserRow();
~UserRow();
};
UserRow::UserRow(){}
UserRow::~UserRow(){}
void UserRow::Print(){
std::cout << " -- User Row -- " << std::endl;
std::cout << this->id << std::endl;
std::cout << this->name << std::endl;
}
class HobbyRow {
public:
unsigned int id;
unsigned int userId;
std::string hobby;
void Print();
HobbyRow();
~HobbyRow();
};
HobbyRow::HobbyRow(){}
HobbyRow::~HobbyRow(){}
void HobbyRow::Print(){
std::cout << " -- Hobby Row -- " << std::endl;
std::cout << this->id << std::endl;
std::cout << this->userId << std::endl;
std::cout << this->hobby << std::endl;
}
class UserAndHobbyRow {
public:
UserRow *userRow;
std::map<int, HobbyRow*> hobbyMap;
void Print();
UserAndHobbyRow();
~UserAndHobbyRow();
};
UserAndHobbyRow::UserAndHobbyRow(){}
UserAndHobbyRow::~UserAndHobbyRow(){}
void UserAndHobbyRow::Print(){
std::cout << " -- User And Hobby Row -- " << std::endl;
this->userRow->Print();
std::map<int, HobbyRow*>::iterator it;
for(it = this->hobbyMap.begin(); it != this->hobbyMap.end(); it++){
it->second->Print();
}
}
int main()
{
UserRow userRow;
userRow.name = "My Name";
userRow.id = 0;
HobbyRow *hobbyRow = new HobbyRow[2];
hobbyRow[0].id = 0;
hobbyRow[0].userId = 0;
hobbyRow[0].hobby = "sports";
hobbyRow[1].id = 1;
hobbyRow[1].userId = 0;
hobbyRow[1].hobby = "cooking";
UserAndHobbyRow userAndHobbyRow;
userAndHobbyRow.userRow = &userRow;
for(unsigned int i = 0; i < 2; i++){
userAndHobbyRow.hobbyMap.insert(std::make_pair(hobbyRow[i].id, &hobbyRow[i]));
}
userAndHobbyRow.Print();
std::map<int, HobbyRow*>::iterator it;
for(it = userAndHobbyRow.hobbyMap.begin(); it != userAndHobbyRow.hobbyMap.end(); it++){
delete it->second; // memory free error
}
return 0;
}
这不是答案，因为这是一个简化的例子。然而，完全相同的是，所有内容都处于相同的函数上下文中。
WalletViewController答案 0 :(得分：2)
您使用new为hobbyRow分配内存
HobbyRow *hobbyRow = new HobbyRow[2];
你需要删除整个数组
delete[] hobbyRow;
目前您执行以下操作：
delete &hobbyRow[0];
delete &hobbyRow[1];