#include <ios>
#include <streambuf>
#include <cassert>
struct testbuf : public std::streambuf {};
int main()
{
{
std::ios ios(0);
ios.clear();
assert(ios.rdstate() == std::ios::badbit);
try
{
ios.exceptions(std::ios::badbit);
}
catch (...)
{
}
try
{
ios.clear();
assert(false);
}
catch (std::ios::failure&)
{
assert(ios.rdstate() == std::ios::badbit);
}
try
{
ios.clear(std::ios::eofbit);
assert(false);
}
catch (std::ios::failure&)
{
assert(ios.rdstate() == (std::ios::eofbit | std::ios::badbit));
}
}
{
testbuf sb;
std::ios ios(&sb);
ios.clear();
assert(ios.rdstate() == std::ios::goodbit);
ios.exceptions(std::ios::badbit);
ios.clear();
assert(ios.rdstate() == std::ios::goodbit);
ios.clear(std::ios::eofbit);
assert(ios.rdstate() == std::ios::eofbit);
}
}