cpp的fstream并没有足够智能到足以保存类对象的的地步,所以你要么自己实现,要么借助第三方类库,下面我帮你写个一个比较简单的方法,你拿去吧
#include <iostream>
#include <fstream>
#include <string>
#include <map>
using namespace std;
class ceshi{
public:
map<int, string> obm;
int count;
friend ifstream& operator>>(ifstream& is, ceshi& st);
friend ofstream& operator<<(ofstream& os, const ceshi& st);
};
ifstream& operator>>(ifstream& is, ceshi& st){
is >> st.count;
//如果map对象有多个的话,这里可以写个循环来循环写入
int first;
string second;
is >> first;
is >> second;
st.obm.insert(pair<int, string>(first, second));
return is;
}
ofstream& operator<<(ofstream& os, ceshi& st){
os << st.count << " ";
for (auto iter = st.obm.begin(); iter != st.obm.end(); iter++) {
os << iter->first << " " << iter->second << " ";
}
return os;
}
int main() {
ceshi c;
c.count = 6;
c.obm[44] = "gdagzsd";
ofstream fout("ceshi.txt");
fout << c;
fout.close();
ceshi c2;
ifstream fin("ceshi.txt");
fin >> c2;
cout << c2.count << endl;
for (auto iter = c2.obm.begin(); iter != c2.obm.end(); iter++){
cout << iter->first << " " << iter->second << endl;
}
fin.close();
return 0;
}
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