Jeffrey Faust wrote:
Jared McIntyre, Danny Havenith, and myself, with support from Jeff Garland have developed a library to stream standard containers to output streams. We would like to submit this for review. The requirements for this library were gathered at the BoostCon 2007 Library in a Week sessions. An initial review was held and further requirements were gathered at BoostCon 2008.
I've been trying to think of when I might use such a library. Without the symmetry (input as well as output) I can think of few instances where this functionality might come in handy. Other than potential debug output, what else do you envision? What am I missing? I'm also finding little improvement over the following example based on your samples. Here I am using Karma to produce the same output as Explore. It is a bit more verbose; however, it is infinitely more flexible. Best regards - michael ------------------------------------------------------------------- #include <boost/config/warning_disable.hpp> #include <iostream> #include <vector> #include <map> #include <list> #include <boost/array.hpp> #include <boost/date_time/gregorian/gregorian.hpp> #include <boost/fusion/include/std_pair.hpp> #include <boost/spirit/include/karma.hpp> #include <boost/spirit/include/karma_format.hpp> #include <boost/spirit/include/karma_stream.hpp> using boost::spirit::stream; using boost::spirit::karma::format; int main() { // simple vector example std::vector<int> vi; vi.push_back(1); vi.push_back(2); vi.push_back(3); std::cout << format('[' << (stream % ", " ) << ']' , vi ); // prints [1, 2, 3] // lets do some containers in containers std::vector<std::vector<int> > vvi; vvi.push_back(vi); vvi.push_back(vi); std::cout << format('[' << *( '[' << (stream % ", " ) << ']' ) << ']' , vvi); // prints [[1, 2, 3][1, 2, 3]] // associative containers std::map<std::string, int> si_map; si_map["hello"] = 1; si_map["world"] = 2; std::cout << format('[' << ( (stream << ':' << stream) % ", " ) << ']' , si_map); // prints [hello:1, world:2] // containers of complex types using namespace boost::gregorian; std::list<date> dl; // date from boost::gregorian dl.push_back(date(2007, Jan, 1)); dl.push_back(date(2007, Jan, 3)); std::cout << format('[' << stream % ", " << ']' , dl); // prints [2007-Jan-1, 2007-Jan-3] // how about some boost container types: boost::array<std::string, 2> sa2; sa2[0] = "one"; sa2[1] = "two"; std::cout << format( '[' << stream % ", " << ']' , sa2); // prints [one, two] } -- ---------------------------------- Michael Caisse Object Modeling Designs www.objectmodelingdesigns.com