Re: [Boost-users] [fusion] how to get the tuple of min values of 2 tuples whatever their length?

2013/7/17 Frédéric Bron

I have two tuples: typedef boost::tuple Key; Key k1, k2;

I would like to get the tuple of the min values for each corresponding value between k1 and k2: Key min=Key(std::min(k1.get<0>(), k2.get<0>()), std::min(k1.get<1>(), k2.get<1>()), std::min(k1.get<2>(), k2.get<2>()));

but I do not know the length of the tuple so I am looking for a generic algorithm... Is this possible with boost::fusion or boost::mpl?

Probably like this: struct min_functor { template<class T> T operator()(T const& a, T const& b) const { return std::min(a, b); } }; auto ret = fusion::transform(k1, k2, min_functor()); fusion::copy(ret, min); HTH