vector<string> Tokenize(string data, char delimiter)
{
	vector<string> pieces;
	unsigned int a = 0;
	unsigned int b;
	while (true)
	{
		b = (unsigned int)(data.find(delimiter, a));
		if (b == string::npos)
			break;
                pieces.push_back( data.substr(a, b - a-1)); 
		a = b + 1;
	}
	pieces.push_back(data.substr(a));
	return pieces;
}

long GetFileSize(ifstream &file)
{
    static const streamoff badPos(-1);
    if (!file)  // test added
        return -1;
    streamoff temp = file.tellg();
    if (temp != badPos && file.seekg(0L, ios::end)) {
        streamoff end = file.tellg();
        if (end != badPos && file.seekg(temp, ios::beg))
            return static_cast<long>(end);
    }
    return -2;
}
 
/// Load the file to fileS string, return filesize. 
/// Non-positive returned if failed
long FileToString(const string &file_path, string &fileS)
{
	ifstream input(file_path.c_str(), ios::binary);
    if (!input) { // simple and clear stream state test
        fileS.clear(); // no contents
        return -1;
    }
	long size = GetFileSize(input);
    if (size <= 0) { // filesize test added.
        fileS.clear();
        return -2;
    }
	char* buffer = new char[size];
    if (input.read(buffer, size)) {
        fileS.reserve(size+size/10); // add reserve
	    fileS.assign(buffer, size);
    } else {
        size = -3;
    }
	delete [] buffer; // [] inserted!
	//input.close(); // no need: let destructor works
	return size;
}

int main()
{
 
	vector<string> temp = Tokenize("blah;blah;blah;blah;", ';');
	for (int i = 0; i < temp.size(); i++)
	{
		cout << temp[i] << endl;
	}
 
	return 0;
}

if (!FileToString(...)) { // Haha, if NOT means SUCCESS