Brainfuck interpreter

#include <vector>
#include <iostream>
#include <fstream>

using namespace std;

int main(int argc, char* argv[])
{
    string inData;
    if (argc == 2)
    {
        string codeFile = argv[1];
        ifstream file(codeFile, ios::in);
        char buff;

        while (file >> buff)
            inData += buff;

        file.close();
    }
    else
    {
        inData = "++++[>++++[>++++<-]<-]>>.";
    }

    vector<unsigned char> memory;
    size_t memory_limit = 30000;
    memory.reserve(memory_limit);

    for (int i = 0; i < memory_limit; i++)
        memory.push_back(0);

    vector<unsigned char>::iterator pointer = memory.begin();
    vector<string::iterator> loopPosition;

    for (string::iterator buffer = inData.begin(); buffer != inData.end(); ++buffer)
    {
        switch (*buffer)
        {
        case '>':
            ++pointer;
            break;
        case '<':
            --pointer;
            break;
        case '+':
            ++(*pointer);
            break;
        case '-':
            --(*pointer);
            break;
        case '[':
            if (*pointer)
            {
                loopPosition.push_back(buffer);
            }
            else
            {
                while (*buffer != ']')
                    ++buffer;
            }
            break;
        case ']':
            if (*pointer)
            {
                buffer = loopPosition.back();
            }
            else
            {
                loopPosition.pop_back();
            }
            break;
        case '.':
            cout << *pointer;
            break;
        case ',':
            cin >> *pointer;
            break;
        default:
            break;
        }
    }

    return 0;
}