Копирование файлов

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <iterator>
#include <algorithm>
 
void CopyFile (const std::string& filename_in, const std::string& filename_out)
{
    std::ifstream f_in (filename_in);
    if (!f_in)
    {
        std::cout << "An error occured while opening file" << std::endl;
    }
 
    f_in.seekg (0, std::ios::end);
    int length = f_in.tellg ();
 
    if (length == -1)
    {
        std::cout << "An error occured while reading file" << std::endl;
    }
 
    f_in.seekg (0, std::ios::beg);
 
    char *buffer = new char [length];
    f_in.read (buffer, length);
 
    f_in.close ();
 
    std::ofstream f_out (filename_out);
    if (!f_out)
    {
        std::cout << "An error occured while opening file" << std::endl;
    }
 
    f_out.write (buffer, length);
 
    f_out.close ();
 
    delete[] buffer;
}
 
int main (int argc, char *argv[])
{
    const std::vector <std::string> args (argv + 1, argv + argc);
    const int minAmountOfArgs = 1;
 
    if (argc > minAmountOfArgs &&
        argc % 2 != 0)
    {
        std::copy (args.cbegin (), args.cend (), std::ostream_iterator <std::string> (std::cout, "\n"));
    }
    else
    {
        std::cout << "You need some args" << std::endl;
        return 1;
    }
 
    CopyFile (args.at (0), args.at (1));
 
    return 0;
}

for (std::vector <std::string>::size_type i = 0; i < args.size (); ++i)
{
    CopyFile (args.at (i), args.at (++i));
}

f_out << f_in.rdbuf();