#include <fstream>
#include <iostream>
#include <stdexcept>

#include <boost/iostreams/stream.hpp>
#include <boost/iostreams/concepts.hpp>
#include <boost/iostreams/categories.hpp>

struct streambuf_test : public boost::iostreams::device<boost::iostreams::input>
{
    std::streamsize read(char* s, std::streamsize n)
    {
        throw std::runtime_error("works !");
    }
};

template <class T>
void test_it(T& t)
{
    try
    {
        char buf[100];
        t.read(buf, 100);
        std::cout << "failed !" << std::endl;
    }
    catch(const std::exception& e)
    {
        std::cout << e.what() << std::endl;
    }    
    catch(...)
    {
        std::cout << "weird error !" << std::endl;
    }
}

int main()
{
    streambuf_test sb;
    boost::iostreams::stream<streambuf_test> stream(sb);
    
    std::cout << "testing streambuf_test... ";
    test_it(sb);
    std::cout << "testing boost::iostream... ";
    test_it(stream);
}