I uploaded sample code to the Vault (in the "Miscellaneous/" directory) that provides a concise notation for list comprehensions. The comprehensions are evaluated lazily and can be used to populate a std::list, vector, or deque, appended to the same, inserted after a given iterator, or interpreted as a boost::range, including compatibility with BOOST_FOREACH. Containers, iterator-defined ranges, or nullary function objects can be used as generators, and arbitrary function objects can be used to specify filter conditions. For example, the Pythagorean Triples example from http://rosettacode.org/wiki/List_comprehensions can be coded as std::vector< boost::tuple<int,int,int> > triples =_(x, y, z)[x <<= range(1, n), y <<= range(x, n), z <<= range(y, n), x*x + y*y == z*z]; , and the (toy) prime number generator at http://www.secnetix.de/olli/Python/list_comprehensions.hawk can be implemented as std::vector<int> nonprimes = _(j)[i <<= range(2, sqrt_max), j <<= range(2 * i, sqrt_max * sqrt_max, i)]; boost::function<std::vector<int>::const_iterator ()> is_composite = bind(std::find<std::vector<int>::const_iterator, int>, nonprimes.begin(), nonprimes.end(), ref(p)); BOOST_FOREACH(int x, (_(p)[p <<= range(2, sqrt_max * sqrt_max), call(is_composite) == nonprimes.end()])) { std::cout << x << std::endl; } (Note the use of call() to represent delayed invocation, and the extra () around the comprehension when used with BOOST_FOREACH.) I've tested this so far with GCC 4.4.4, GCC 4.5.2, and Clang 2.9, using Boost 1.42 and 1.45, and with and without -std=c++0x. Reports of success/failure with other environments are most welcome. The code is still in a prototype stage, so I'm more than happy to take design suggestions and would love to hear about use cases I've overlooked. If there's sufficient interest I will work on getting it to production quality and writing some real documentation. I apologize in advance for wasting everybody's time if something like this already exists in Phoenix; I'm not too familiar with it but I skimmed the docs and didn't see anything. Enjoy, Brent