Hello, In my test program below, I have a container of columns and want to output the column headers into a string separated by a tab. The lambda expression is looking fairly complicated so I wonder if it could be made simpler or if there's any other algorithm I should've used to put a separator between the elements? Regards, Pete #include <algorithm> #include <iostream> #include <string> #include <vector> #include <boost/lambda/bind.hpp> #include <boost/lambda/lambda.hpp> #include <boost/lambda/if.hpp> class Column { public: explicit Column(const std::string& str) : str_(str) {} const std::string& getColumnText() const {return str_;} private: std::string str_; }; int main() { using namespace boost::lambda; using boost::lambda::_1; std::vector<Column> cols; cols.push_back(Column("Fred")); cols.push_back(Column("Jim")); cols.push_back(Column("Harry")); const std::size_t numCols = static_cast<size_t>(cols.size()); const char fieldSeparator = '\t'; std::string outputText; std::size_t i = 1; var_type<std::size_t>::type iV(var(i)); std::for_each(cols.begin(),cols.end(), ( var(outputText) += bind(&Column::getColumnText,_1), if_then(iV < constant(numCols),var(outputText) += constant(fieldSeparator)), ++iV ) ); std::cout << '[' << outputText << ']'; }