52   using StrStream = std::basic_stringbuf<CharT, TraitsT, AllocT>;  in test_sfinae()  typedef
55   static_assert(std::constructible_from<StrStream, CharT*, std::ios_base::openmode>);  in test_sfinae()
56   static_assert(!test_convertible<StrStream, CharT*, std::ios_base::openmode>());  in test_sfinae()
59   static_assert(std::constructible_from<StrStream, const CharT*, std::ios_base::openmode>);  in test_sfinae()
60   static_assert(!test_convertible<StrStream, const CharT*, std::ios_base::openmode>());  in test_sfinae()
64 …std::constructible_from<StrStream, const std::basic_string_view<CharT, TraitsT>, std::ios_base::op…  in test_sfinae()
65 …static_assert(!test_convertible<StrStream, const std::basic_string_view<CharT, TraitsT>, std::ios_…  in test_sfinae()
68 …static_assert(std::constructible_from<StrStream, const std::basic_string<CharT, TraitsT>, std::ios…  in test_sfinae()
69 …static_assert(!test_convertible<StrStream, const std::basic_string<CharT, TraitsT>, std::ios_base:…  in test_sfinae()
73 …std::constructible_from<StrStream, const ConstConvertibleStringView<CharT, TraitsT>, std::ios_base…  in test_sfinae()
75 …!test_convertible<StrStream, const ConstConvertibleStringView<CharT, TraitsT>, std::ios_base::open…  in test_sfinae()
79 …!std::constructible_from<StrStream, NonConstConvertibleStringView<CharT, TraitsT>, std::ios_base::…  in test_sfinae()
80 …static_assert(!test_convertible<StrStream, NonConstConvertibleStringView<CharT, TraitsT>, std::ios…  in test_sfinae()
84 …constructible_from<StrStream, const NonConstConvertibleStringView<CharT, TraitsT>, std::ios_base::…  in test_sfinae()
86 …!test_convertible<StrStream, const NonConstConvertibleStringView<CharT, TraitsT>, std::ios_base::o…  in test_sfinae()
89   static_assert(!std::constructible_from<StrStream, const SomeObject, std::ios_base::openmode>);  in test_sfinae()
90   static_assert(!test_convertible<StrStream, const SomeObject, std::ios_base::openmode>());  in test_sfinae()
93 …static_assert(!std::constructible_from<StrStream, const std::basic_string_view<CharT, TraitsT>, co…  in test_sfinae()
94 …static_assert(!test_convertible<StrStream, const std::basic_string_view<CharT, TraitsT>, const Som…  in test_sfinae()
99   using StrStream = std::basic_stringbuf<CharT, TraitsT, AllocT>;  in test()  typedef
105     StrStream ss(CS("zmt"), std::ios_base::out | std::ios_base::in);  in test()
111     StrStream ss(csv, std::ios_base::out | std::ios_base::in);  in test()
117     StrStream ss(cs, std::ios_base::out | std::ios_base::in);  in test()
123     StrStream ss(sv, std::ios_base::out | std::ios_base::in);  in test()