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GCC 4.4.2でもerrorでした g++ -std=c++0x ref_test.cppref_test.cpp: In function void f(Type) [with Type = std::reference_wrapper]':ref_test.cpp:23: iaainnttsted from hereref_test.cpp:13: error: no match for operator=' in x = 1'/usr/include/c++/4.3/tr1_impl/functional:452: note: candidates are: std::reference_wrapper<_Tp>& std::reference_wrapper<_Tp>::operator=(const std::reference_wrapper<_Tp>&) [with _Tp = int]