Christopher Schmidt schrieb:
Denis Taniguchi schrieb:
Hi,
I was trying to implement something equivalent to the following piece of code:
template<class Field1, class Field2, ... , class FieldN, class Range, class Function> Function for_each(Range&r, Function f) { using namespace boost; using namespace boost::fusion;
BOOST_FOREACH(typename range_value<Range>::type&v, r) { at_key<Field1>(v) = f(at_key<Field2>(v), at_key<Field3>(v), ... , at_key<FieldN>(v)); } return f; }
Is there a simple way to do this using fusion's current functionalities?
If you pass Field2...FieldN wrapped in a mpl sequence, its quiete simple. See the attached code for an example implementation.
Hi Christopher, yes, you are right. The function fusion::invoke is able to do it. However, IMHO using the preprocessor for this paricular situation will suit it more. Just my opinion. -Kim
-Christopher ------------------------------------------------------------------------
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