Joel de Guzman-2 wrote:
On 3/29/2011 12:37 AM, lcaminiti wrote: > > This worked :)) Finally Boost.Local's Phoenix example reads: > > #include<boost/spirit/include/phoenix.hpp> > #include > #include > #include > > int main() { > double sum = 0.0; > int factor = 10; > > std::vector v(3); > v[0] = 1.0; v[1] = 2.0; v[2] = 3.0; > > // Passed as template parameter and also defined at expression level. > std::for_each(v.begin(), v.end(), boost::phoenix::let( > // Bind `factor` by constant (reference). > boost::phoenix::local_names::_f = boost::phoenix::cref(factor))[ > // Unfortunately, body cannot use C++ statement syntax. > // Access `sum` by (non-constant) reference. > boost::phoenix::ref(sum) += boost::phoenix::local_names::_f * > boost::phoenix::arg_names::_1, > std::cout<< boost::phoenix::val("Summed: ")<< > boost::phoenix::ref(sum)<< "\n" > ]); > > std::cout<< sum<< std::endl; > return 0; > } > > BTW, this is pretty powerful stuff ;)
I'd use using declarations to avoid code clutter and make the code more readable.
int main() { double sum = 0.0; int factor = 10;
std::vector v(3); v[0] = 1.0; v[1] = 2.0; v[2] = 3.0;
using boost::phoenix::let; using boost::phoenix::local_names::_f; using boost::phoenix::cref; using boost::phoenix::ref; using boost::phoenix::arg_names::_1; using boost::phoenix::val;
// Passed as template parameter and also defined at expression level. std::for_each(v.begin(), v.end(), let( // Bind `factor` by constant (reference). _f = cref(factor))[ // Unfortunately, body cannot use C++ statement syntax. // Access `sum` by (non-constant) reference. ref(sum) += _f * _1, std::cout << val("Summed: ") << ref(sum) << "\n" ]);
std::cout << sum << std::endl; return 0; }
Yes and I will do the same for the Boost.Lambda example. Thanks. --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/local-Help-for-the-Alternatives-section-t... Sent from the Boost - Dev mailing list archive at Nabble.com.