#include <boost/bind.hpp>
#include <iostream>

using namespace boost;
using namespace std;

struct Foo {

    Foo() : s( "X" ), l( 11 ) { }

    void operator()( const char* s_, int l_ ) {
        s = s_; l = l_;
    }

    const char* s;
    int l;
};

struct Bar {

    Bar( Foo& foo_ ) : foo( foo_ ) { }

    void operator()( const char* s_ ) {
        bind<void>(foo, _1, 42)(s_);
    }

    Foo& foo;
};

int main ()
{
    Foo f;
    Bar b( f );

    b( "Hallo" );

    cout << f.s << ", " << f.l << endl;
}