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C-/C++-Quelltext

class user{
    public:
        void save(std::ofstream &outputFile);
}

void user::save(std::ofstream &outputFile){
    outputFile.write(name.c_str(), name.length);
    
    for(auto i : intlist){
        outputFile.write(/* ... */);
    }
}

// Dann an anderer Stelle:

std::ofstream outputFile("/path/to/file.txt");

if(!outputFile.good()){
    // Fehler
}

for(auto u : userlist){
    u->save(outputFile);
}

C-/C++-Quelltext

#include <iostream>
#include <iterator>
#include <fstream>
#include <vector>

struct to_save
{
    explicit to_save(int _a=0, int _b=0)
        : a(_a), b(_b)
    { }
    int a;
    int b;
    friend std::ostream& operator<<(std::ostream& os, const to_save& s);
    friend std::istream& operator>>(std::istream& is, to_save& s);
};
std::ostream& operator<<(std::ostream& os, const to_save& s)
{ return os << s.a << " " << s.b << "\n"; }
std::istream& operator>>(std::istream& is, to_save& s)
{ return is >> s.a >> s.b; }

int main()
{
    std::ofstream _of("data");
    std::vector<to_save> v{to_save{1, 2},to_save{3, 3},to_save{2, 1}};
    for(auto& a : v)
        _of << a;
    v[0]=v[1]=v[2]=to_save();
    _of.close();
    
    std::ifstream _if("data");
    
    std::cout << "In Datei: " << std::endl;
    for(std::string s; std::getline(_if, s); std::cout << s << std::endl)
    { }
    _if.clear();
    _if.seekg(0);
    for(auto& a : v)
        _if >> a;
    std::cout << "Neu im Container: " << std::endl;
    std::copy(v.begin(), v.end(), std::ostream_iterator<to_save>(std::cout));
}