34         std::filebuf f2;  in main()  local
35         swap(f2, f);  in main()
37         assert(f2.is_open());  in main()
38         assert(f2.sgetc() == '2');  in main()
51         std::filebuf f2;  in main()  local
52         swap(f, f2);  in main()
54         assert(f2.is_open());  in main()
55         assert(f2.sgetc() == '2');  in main()
71         std::filebuf f1, f2;  in main()  local
73         assert(f2.open(tmpB, std::ios_base::in) != 0);  in main()
75         assert(f2.sgetc() == 'a');  in main()
77         swap(f1, f2);  in main()
80         assert(f2.sgetc() == '0');  in main()
95         std::wfilebuf f2;  in main()  local
96         swap(f2, f);  in main()
98         assert(f2.is_open());  in main()
99         assert(f2.sgetc() == L'2');  in main()