I need to implement Huffman coding using a binary tree. I have successfully created the tree and have been able to execute the program by manually entering the characters and their frequencies but I now need to read the characters/frequencies from an input file and then output their matching Huffman codes to an output file. I believe that the problem lies in overloading the >> operator which would allow me to read in the values from the input file. Any help on this would be greatly appreciated.

#pragma warning(disable:4099)
#include "huffman.h"
#include <map>
#include <ostream>
#include <algorithm>
#include <iterator>
#include <string>

using namespace std;

ostream& operator<<(std::ostream& os, std::vector<bool> vec)
	std::copy(vec.begin(), vec.end(), std::ostream_iterator<bool>(os, ""));
	return os;

/*istream& operator>>(std::istream& is, std::vector<bool> vec)
	std::copy(vec.begin(), vec.end(), std::istream_iterator<bool>(is, ""));
	return os;

int main(int argc, char *argv[]) 
	ifstream iFile;
	ofstream oFile;

	map<char, double> frequencies;

	if (argc != 3) 
		cerr << "Command requires <input_file> <output_file>" << endl;
		return EXIT_FAILURE;
		// open files
		if ( iFile.is_open() && oFile.is_open() ) 
				char char1;
				int	freq;

				iFile << char1 << freq;

				frequencies[char1] = freq;

				Hufftree<char, double> hufftree(frequencies.begin(), frequencies.end());

				for (char ch = 'a'; ch <= 'z'; ++ch)
					oFile << ch << " " << hufftree.encode(ch) << "\n";
		// close files
		return EXIT_SUCCESS;

I don't think it makes sense to use << on an ifstream.

I think you should look into the getline() function. You shouldn't have to overload the >> operator to do this.