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8537e48510
Add constructors to stringbuf, stringstream, istringstream, and ostringstream, and a matching overload of str(sv) in each, that take anything convertible to a string_view in places where the existing ctors and function take a string. Note this change omits the constraint applied to the istringstream constructor from string cited as a "drive-by" in P2495R3, as we have determined it is redundant. libstdc++-v3/ChangeLog: PR libstdc++/119741 * include/std/sstream: full implementation, really just decls, requires clause and plumbing. * include/bits/version.def, include/bits/version.h: new preprocessor symbol __cpp_lib_sstream_from_string_view. * testsuite/27_io/basic_stringbuf/cons/char/string_view.cc: New tests. * testsuite/27_io/basic_istringstream/cons/char/string_view.cc: New tests. * testsuite/27_io/basic_ostringstream/cons/char/string_view.cc: New tests. * testsuite/27_io/basic_stringstream/cons/char/string_view.cc: New tests. * testsuite/27_io/basic_stringbuf/cons/wchar_t/string_view.cc: New tests. * testsuite/27_io/basic_istringstream/cons/wchar_t/string_view.cc: New tests. * testsuite/27_io/basic_ostringstream/cons/wchar_t/string_view.cc: New tests. * testsuite/27_io/basic_stringstream/cons/wchar_t/string_view.cc: New tests.
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