Some problems with Compress/Decompress program.

Hey Experts.
Some days ago I posted a question here for some help with a compress/decompress program.
Got the help I needed and wrote the code below to test with boost iostreams a little bit and finally get to where I want to.

(I'm new to C++ development so it is possible to have syntax erros in the code, point them out for me if you see any please!)

#include <iostream>
#include <sstream>

#include </usr/include/boost/assign/list_of.hpp>
#include </usr/include/boost/iostreams/copy.hpp>
#include </usr/include/boost/iostreams/device/back_inserter.hpp>
#include </usr/include/boost/iostreams/filter/zlib.hpp>
#include </usr/include/boost/iostreams/filtering_stream.hpp>

//-----------------------------------------------------------------------------
void
    compress
    (
        const std::string& data,
        std::string&       buffer
    )
{
    buffer.clear();
    boost::iostreams::filtering_streambuf<boost::iostreams::output> out;
    out.push(boost::iostreams::zlib_compressor());
    out.push(boost::iostreams::back_inserter(buffer));
    boost::iostreams::copy(boost::make_iterator_range(data), out);
}

//----------------------------------------------------------------------------
void
    decompress
    (
        const std::string& buffer,
        std::string&       data
    )
{
    boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
    in.push(boost::iostreams::zlib_decompressor());
    in.push(boost::make_iterator_range(buffer));
    data.clear();
    boost::iostreams::copy(in, boost::iostreams::back_inserter(data));
}

//----------------------------------------------------------------------------
int main()
{
    const std::string send_data = "Test, test, test, test!!!!!";
    std::string received_data;
    std::string buffer;

    compress(send_data, buffer);
    decompress(buffer, received_data);
   
    if(send_data == received_data)
       std::cout << send_data << " equals " << received_data << std::endl;
    else
       std::cout << "Erro: " << send_data << " differs from " << received_data << std::endl;

    return 0;
}

But I keep getting this freaking error while trying to compile it:

testedc.cpp: In function ‘int main()’:
testedc.cpp:45: error: invalid conversion from ‘int’ to ‘const char*’
testedc.cpp:45: error:   initializing argument 1 of ‘std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]’

I can't find that invalid conversion it is telling me.
Can you guys help me with this?
Also, I would like you guys to take a look in my code up there and see if everything is fine with it.

A couple more questions:
* How can I make the file go to a specific directory after it is compressed?
* If the file to decompress is not in a buffer but in a directory, how can I tell the function decompress() to work?
* If the path to the file needed be decompressed is stored in other variable, how can I tell the function decompress() to work?
* How can I handle possible exception errors from compress() and decompress()?
* Any thoughts on how to make this program the most efficient possible, in terms of speed of the compress and decompress functions?