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These swap overloads are non-standard, but are needed to make swap work for vector<bool>::reference rvalues. They don't need to be called explicitly, only via ADL, so hide them from normal lookup. This is what I've proposed as the resolution to LWG 3638. libstdc++-v3/ChangeLog: * include/bits/stl_bvector.h (swap(_Bit_reference, _Bit_reference)) (swap(_Bit_reference, bool&), swap(bool&, _Bit_reference)): Define as hidden friends of _Bit_reference.
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.