[boost] program_options & VC6: internal compiler error?

From: Olaf van der Spek (OvdSpek_at_[hidden])
Date: 2004-12-15 18:47:46

Hi,

I was trying to use the program_options library and used the following 
example.
However, I got an internal compiler error.
I reduced the example to this minimum.
The library build fine, so I assume it's compatible with VC6.
What went wrong?

Code:
#include "stdafx.h"
#include <boost/program_options.hpp>
#include <iostream>

int main(int ac, char* av[])
{
        boost::program_options::variables_map vm;
        std::cout << vm["compression"].as<int>(); // line 8
        return 0;
}

Output:
Configuration: Program Options Test - Win32 Release
Compiling...
StdAfx.cpp
Compiling...
Program Options Test.cpp
C:\VC\temp\Program Options Test\Program Options Test.cpp(8) : error 
C2679: binary '<<' : no operator defined which takes a right-hand 
operand of type '' (or there is no acceptable conversion)
C:\VC\temp\Program Options Test\Program Options Test.cpp(8) : error 
C2062: type 'int' unexpected
Error executing cl.exe.

Program Options Test.exe - 2 error(s), 0 warning(s)

Configuration: Program Options Test - Win32 Debug
Compiling...
Program Options Test.cpp
C:\VC\temp\Program Options Test\Program Options Test.cpp(8) : fatal 
error C1001: INTERNAL COMPILER ERROR
         (compiler file 'msc1.cpp', line 1794)
          Please choose the Technical Support command on the Visual C++
          Help menu, or open the Technical Support help file for more 
information
Error executing cl.exe.

Program Options Test.exe - 1 error(s), 0 warning(s)

-- 
Olaf van der Spek
http://xccu.sf.net/