[Boost-users] [Asio] streambuf exceptions

Subject: [Boost-users] [Asio] streambuf exceptions
From: Dylan Klomparens (dylan.klomparens_at_[hidden])
Date: 2010-02-25 11:48:32

I'm using an asio::streambuf to read and write data to a socket. Despite my
best efforts, I can't get the streambuf to throw an exception if I consume
too much. I'm trying to get it to throw an exception so I can test an error
case.

The documentation says streambuf::consume will throw an std::length error if
the requested amount to read is greater than the input stream size (
http://www.boost.org/doc/libs/1_42_0/doc/html/boost_asio/reference/basic_streambuf/consume.html).
But in my test program, this did not happen. Do I need to enable exception
throwing somehow? Or is streambuf working as intended and not supposed to
throw an exception?

Here is my test program:

#include <iostream>
#include <boost/asio.hpp>
using namespace std;

int main()
{
    char in[] = "hello";
    char out[6] = {0, 0, 0, 0, 0, 0};
    boost::asio::streambuf s;
    s.sputn(in, sizeof(in));
    s.sgetn(out, sizeof(in));
    cout << out << endl << s.size() << endl;
    s.consume(1000);
    return 0;
}