https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80624
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Some more examples of misbehaviour caused by eof() being a valid character:
#include <sstream>
#include <cassert>
int main()
{
std::basic_ostringstream<char16_t> s;
s.put(u'\uFFFF');
assert( s.str().length() == 1 );
}
a.out: ex.cc:8: int main(): Assertion `s.str().length() == 1' failed.
Aborted (core dumped)
#include <sstream>
int main()
{
std::basic_ostringstream<char16_t> s(u"foo");
s.exceptions(std::ios_base::badbit);
s.put(u'\uFFFF');
}
terminate called after throwing an instance of 'std::ios_base::failure'
what(): basic_ios::clear
Aborted (core dumped)
#include <sstream>
#include <cassert>
int main()
{
const char16_t ffff = u'\uFFFF';
std::basic_istringstream<char16_t> s(u"\uFFFFoo");
s.exceptions(std::ios_base::eofbit);
assert( s.rdbuf()->in_avail() > 1 );
auto c = s.get();
}
terminate called after throwing an instance of 'std::ios_base::failure'
what(): basic_ios::clear
Aborted (core dumped)
