On 8/9/07, shunsuke <pstade.mb@gmail.com> wrote:
Marcus Lindblom wrote:
Please add a make_value_range() too, that uses the range-library (boost::begin & boost::end).
FWIW, oven(http://tinyurl.com/2axp2l) implemented that. :-)
BOOST_FOREACH (string v, make_map_values(m)) { // ... }
make_map_values(m) is synonym of make_elements<mpl::int_<1> >(m) that iterates over a range of FusionSequence.
I agree no specific iterator is needed. make_elements is actually implemented using transform_iterator and a FunctionObject.
Also note that Boost.Lambda can't be used here. A Boost.Lambda functor is not Assignable.
Yes, that is very unfortunate and I think it should be fixed. I saw that oven uses a special wrapper to make boost.lambda objects copiable. What does it exactly do? The wrapper I use simply does a placement new in its assignment operator. This is very exception unsafe, but I presume that most (all?) lambda objects won't throw on copy constructor. Using boost.optional would give the basic exception safetly, but it does increase the size of the wrapper. gpd