| 41 | //[tutorial_adder |
| 42 | template <typename Iterator> |
| 43 | bool adder(Iterator first, Iterator last, double& n) |
| 44 | { |
| 45 | bool r = qi::phrase_parse(first, last, |
| 46 | |
| 47 | // Begin grammar |
| 48 | ( |
| 49 | double_[ref(n) = _1] >> *(',' >> double_[ref(n) += _1]) |
| 50 | ) |
| 51 | , |
| 52 | // End grammar |
| 53 | |
| 54 | space); |
| 55 | |
| 56 | if (first != last) // fail if we did not get a full match |
| 57 | return false; |
| 58 | return r; |
| 59 | } |
| 60 | //] |
| 61 | } |
| 62 |