c++ - Insert record in binary data file

Question

In C++ binary file handling what does the syntax (file.read((char *)&vg, sizeof(vg))) mean?

Answer 1

The first argument is casting the array "vg" to a char pointer. sizeof(vg) returns the size of the array in bytes. A C++ way to do this would be

std::array<int, 10> vg{};
file.read(static_cast<char*>(vg.begin()), vg.size());