Hello, The following code, which compiles just fine with g++ 4.4 without the --std=c++0x flag, gives an error with that flag: #include <string> #include <boost/tuple/tuple.hpp> #include <boost/algorithm/string.hpp> using boost::make_tuple; void f(int i, const std::string& s) { boost::tuple<int, std::string> t; t = make_tuple(i, s); } test.cpp: In function ‘void f(int, const std::string&)’: test.cpp:12: error: no match for ‘operator=’ in ‘t = std::make_tuple(_Elements&& ...) [with _Elements = int&, const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&](((const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)((const std::string*)s)))’ Note that any one of the following makes the code compile: 1) Removing the --std=c++0x flag 2) Removing the <boost/algorithm/string.hpp> include 3) Removing the using boost::make_tuple declaration and explciitly qualifying boost::make_tuple in f(). What is going on? Thanks, Nate. _________________________________________________________________ Learn more ways to connect with your buddies now http://go.microsoft.com/?linkid=9734388