GCC provides experimental support for the upcoming ISO C++ standard, C++0x. This support can be enabled with the -std=c++0x or -std=gnu++0x compiler options; the former disables GNU extensions. GCC's C++0x mode tracks the C++0x working paper drafts produced by the ISO C++ committee, available on the ISO C++ committee's web site at https://www.open-std.org/jtc1/sc22/wg21/. Since this standard is st