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From: Peter Dimov (pdimov_at_[hidden])
Date: 2007-05-15 12:18:42

Marcus Lindblom wrote:

> In the bind()-cases, it uses mem_fn to call the actual function:
> template<class C>
> template<class T, typename A1, typename A2>
> void ScriptClassImpl<C>::ElemBinder::bind(void (T::*f)(A1, A2),
> const char* n1, const char* n2) {
> BOOST_STATIC_ASSERT((::boost::is_base_and_derived<T,
> C>::value||::boost::is_same<T, C>::value));
> typedef boost::function<void (T&, A1, A2)> func_type;
> *m_f = xml::mkApplyElemFunctor<func_type>(boost::mem_fn(f),
> *m_log).arg(n1).arg(n2);
> }

Sounds sensible, although you can use something like

*m_f = boost::bind( f, _1,

    boost::bind( getArg<A1>, _2, n1 ),
    boost::bind( getArg<A2>, _2, n2 ) );


I'm somewhat reluctant to introduce features into boost::mem_fn since
std::tr1::mem_fn and the upcoming std::mem_fn don't/won't have them. If you
start using ::argN_type, you won't be able to switch to std::mem_fn once it
becomes available. Of course if this is not a concern for the Boost
community we can easily add the typedefs and the arity.

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