Re: [Boost-users] Boost.Function and template function 2

On Jun 26, 2007, at 5:05 PM, gast128 wrote:

Since no one react, I tried to reverse engineer Boost.Function and pin down the problem:

template struct Functor { template <typename F> Functor(F f, int i = 0) : m_pf(0) { m_pf = reinterpret_cast<Pf>(f); }

template <typename T> R Invoke(T t) { typedef R (*Pf1)(Arg1); return (*(Pf1)m_pf)(t); }

typedef void (*Pf)(void); Pf m_pf; };

template <typename T> bool func_template(T* p) { return p != 0; }

void TestBugFunctor() { Functor fc2 = &func_template<int>; fc2.Invoke((int*)0); //crash }

The trick with the extra dummy constructor argument is copied form boost function header files. Without it one gets an ICE, but with it, VStudio 2003 sp1 generates a suspectable call.

Oh, that's bad. I don't have this compiler on hand to work with... if someone has a workaround, I would gladly apply it to Boost.Function. - Doug