Ben Pope wrote:
This should work and is probably clearer:
return do_something_conditional(handle, boost::bind(std::logical_and<bool>(), !boost::bind(&pred_a, _1), boost::bind(&pred_b, _1, n1, n2)));
Or even return do_something_conditional(handle, !boost::bind(&pred_a, _1) && boost::bind(&pred_b, _1, n1, n2) ); As for the original error, error C2664: 'bool std::logical_and<_Ty>::operator ()(const _Ty &,const _Ty &) const' : cannot convert parameter 1 from 'boost::unary_negate<Predicate>' to 'const bool &' the compiler is right, logical_and doesn't accept boost::not1(&pred_a) as a first argument, it takes a bool. To make it compile, one needs to wrap boost::not1(&pred_a) in a boost::bind, as follows: bool do_something(int *handle, int n1, int n2) { return do_something_conditional(handle, boost::bind(std::logical_and<bool>(), boost::bind(boost::not1(&pred_a), _1), boost::bind(&pred_b, _1, n1, n2))); } This will call boost::not1(&pred_a) with _1 instead of passing it as-is to logical_and.