A library which throws cross-boundary exceptions

unwind.cxx

// g++ -O0 -shared -o unwind.dll unwind.cxx
// OR
// cl.exe /nologo /Od /MD /EHa /LD /Fe:unwind.dll unwind.cxx
#include <iostream>
#include <exception>
#include <windows.h>

class Foo
{
public:
    ~Foo()
    {
        std::cerr << "Exiting C++" << std::endl;
    }
};

typedef void(*func)(void*);

void throws_fn()
{
    std::cerr << "C++ throws exception" << std::endl;
    throw std::exception();
}

extern "C" __declspec(dllexport) void catches_fn(func fn)
{
    Foo foo;
    try
    {
        fn(throws_fn);
    }
    catch(std::exception& e)
    {
        std::cerr << "C++ catches exception" << std::endl;
    }
}