Hello, group I am trying out the code snippet in http://www.boost.org/doc/html/lambda/le_in_details.html 'Naming delayed constants and variables'. I got some compile errors complaining about synthesized method error with the following code: #include <iostream> #include <boost/lambda/lambda.hpp> #include <boost/ref.hpp> #include <vector> #include <iterator> #include <algorithm> using namespace std; using namespace boost::lambda; using namespace boost; int main(){ int i = 1; (_1 += 2)(i); // i is now 3 (++_1, cout << _1 << '\n')(i); // i is now 4, outputs 4 int j = 40; _1 = j; var(i) = _1 = j; cout << i << '\n'; vector<int> a; a.reserve(10); a.resize(10); //for_each(a.begin(), a.end(), istream_iterator<int>(cin)); // for_each(a.begin(), a.end(), cin >> _1); i = 0; for_each(a.begin(), a.end(), (_1 = var(i)++)); // delayed evaluation through 'var' for_each(a.begin(), a.end(), cout << _1 << ' '); cout << '\n'; for_each(a.begin(), a.end(), cout << ' ' << _1); cout << '\n'; for_each(a.begin(), a.end(), (var(j) = _1, _1 = var(i), var(i) = var(j))); <------------ Error for_each(a.begin(), a.end(), cout << _1 << ' '); cout << '\n'; }