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- Add a missing 'explicit' to a basic_stringbuf constructor. - Set up the get/put area pointers in the constructor from strings using different allocator types. - Remove public basic_stringbuf::__sv_type alias. - Do not construct temporary basic_string objects with a default-constructed allocator. Also, change which basic_string constructor is used, as a minor compile-time optimization. Constructing from a basic_string_view requires more work from the compiler, so just use a pointer and length. libstdc++-v3/ChangeLog: * include/std/sstream (basic_stringbuf(const allocator_type&): Add explicit. (basic_stringbuf(const basic_string<C,T,SA>&, openmode, const A&)): Call _M_stringbuf_init. Construct _M_string from pointer and length to avoid constraint checks for string view. (basic_stringbuf::view()): Make __sv_type alias local to the function. (basic_istringstream(const basic_string<C,T,SA>&, openmode, const A&)): Pass string to _M_streambuf instead of constructing a temporary with the wrong allocator. (basic_ostringstream(const basic_string<C,T,SA>&, openmode, const A&)): Likewise. (basic_stringstream(const basic_string<C,T,SA>&, openmode, const A&)): Likewise. * src/c++20/sstream-inst.cc: Use string_view and wstring_view typedefs in explicit instantiations. * testsuite/27_io/basic_istringstream/cons/char/1.cc: Add more tests for constructors. * testsuite/27_io/basic_ostringstream/cons/char/1.cc: Likewise. * testsuite/27_io/basic_stringbuf/cons/char/1.cc: Likewise. * testsuite/27_io/basic_stringbuf/cons/char/2.cc: Likewise. * testsuite/27_io/basic_stringbuf/cons/wchar_t/1.cc: Likewise. * testsuite/27_io/basic_stringbuf/cons/wchar_t/2.cc: Likewise. * testsuite/27_io/basic_stringstream/cons/char/1.cc: Likewise.
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