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Message: [QUOTE="nandor.sieben, post: 3480248"] The following program causes a segmentation fault. If I break the print line at the end into two separate print statement then there is no segmentation fault. What is the problem? I am compiling it on Ubuntu Gutsy. using namespace std; #include <iostream> #include <sstream> template < class T > string all2string (T in, int i) { stringstream s; s << in; string ss; ss = s.str (); while (ss.length () < i) ss = "0" + ss; return ss; } typedef struct { int move; int depth; } Tdata; string Tdata2string (const Tdata & data) { string s = all2string (data.depth, 0) + " " + all2string (data.move, 0) + " "; return s; } ostream & operator << (ostream & os, const Tdata & data) { string s = Tdata2string (data); os << s; } main () { Tdata dat; dat.depth = 0; dat.move = -1; cout << dat <<"data \n"; } [/QUOTE]