Saving file data from current position to end of file with fstream

Question

I have a situation where I loop through the first 64 lines of a file and save each line into a string. The rest of the file is unknown. It may be a single line or many. I know that there will be 64 lines at the beginning of the file but I do not know their size.

How can I save the entirety of the rest of the file to a string?

This is what I currently have:

std::ifstream signatureFile(fileName);

for (int i = 0; i < 64; ++i) {
    std::string tempString;
    //read the line
    signatureFile >> tempString;
    //do other processing of string
}
std::string restOfFile;
//save the rest of the file into restOfFile

Thanks to the responses this is how I got it working:

std::ifstream signatureFile(fileName);

for (int i = 0; i < 64; ++i) {
    std::string tempString;
    //read the line
    //using getline prevents extra line break when reading the rest of file
    std::getline(signatureFile, tempString);
    //do other processing of string
}

//save the rest of the file into restOfFile
std::string restOfFile{ std::istreambuf_iterator<char>{signatureFile},
        std::istreambuf_iterator<char>{} };
signatureFile.close();

Answer 1

One of std::string's constructors is a template that takes two iterators as parameters, a beginning and an ending iterator, and constructs a string from the sequence defined by the iterators.

It just so happens that std::istreambuf_iterator provides a suitable input iterator for iterating over the contents of an input stream:

std::string restOfFile{std::istreambuf_iterator<char>{signatureFile},
        std::istreambuf_iterator<char>{}};