Vector input/output

#include <iostream>
#include <algorithm>
#include <fstream>
#include <vector>

int main()
{
    {
        std::vector<long> v = { 1, 2, 3, 4 };

        std::ofstream out("/tmp/test.bin", std::ios::binary);

        std::for_each(std::begin(v), std::end(v), [&out](const long& v) {
            out.write(reinterpret_cast<const char*>(&v), sizeof(v));
        });
    }

    {
        std::vector<long> v(4);

        std::ifstream in("/tmp/test.bin", std::ios::binary);

        std::for_each(std::begin(v), std::end(v), [&in](long& v) {
            in.read(reinterpret_cast<char*>(&v), sizeof(v));
        });

        for(const auto& n : v)
            std::cout << n << '\n';
    }
}