https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63753
Bug ID: 63753 Summary: std::transform does not change size Product: gcc Version: 4.9.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: darkdragon-001 at web dot de When using std::transform with a OutputIterator to std::vector then the vector size is not updated (see code attached): #include <algorithm> #include <iostream> #include <vector> using namespace std; int main() { vector<double> v = {1,2,3,4,5}; vector<double> r; r.reserve(v.size()); transform(v.begin(),v.end(),r.begin(),[](const double& d) { return 2*d; }); cout << "size:" << r.size() << "front:" << r.front() << endl; return 0; }