El 07/09/2011 0:05, Szymon Gatner escribió: It's moved, this feature produces the limitation (must define copy-constructor for copyable types owning copyable and movables classes like boost::container::vector) that Daniel has suffered. Example: #include <boost/container/vector.hpp> #include <string> struct template_symbol { template_symbol(){} template_symbol(const template_symbol &x) : params(x.params) {} template_symbol& operator=(const template_symbol &x) { params = x.params; return *this; } boost::container::vector<std::string> params; }; boost::container::vector<template_symbol> func() { return boost::container::vector<template_symbol>(); } int main() { //RVO boost::container::vector<template_symbol> x (func()); //Moved x = func(); return 0; } I think I'd should add this info to container documentation. Best, Ion