C++

22.5    Reading Data

The following listing presents two simple helper functions that handle reading and writing.

// https://godbolt.org/z/84TcTbWjjstd::vector<char> readFile(const string& fName) {    std::ifstream file{ fName, std::ifstream::binary };    if(!file) throw std::runtime_error("Error opening input");    file.seekg(0, file.end);           // jump to the end of the file    const auto length = file.tellg();  // current position is file size    if(length > 1024*1024*1024)        throw std::runtime_error("No more than 1 GB please");    file.seekg(0, file.beg);           // back to the beginning    std::vector<char> data(length);    // allocate space    file.read(data.data(), length);    // read in one go    return data;                       // not copied (keyword: RVO)}void pack(const string& fNameIn, const string& ...