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Returns the current internal error state flags of the stream.
The internal error state flags are automatically set by calls to input/output functions on the stream to signal certain errors.
eofbit, failbit and badbit are member constants with implementation-defined values that can be combined (as if with the bitwise OR operator).
goodbit is zero, indicating that none of the other bits is set.
Concurrent access to the same stream object may cause data races.
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<ios>
types
manipulators
other functions
-
iostream_categoryC++11
-
basic_ios
- basic_ios::~basic_ios
- basic_ios::basic_ios
public members
- basic_ios::bad
- basic_ios::clear
- basic_ios::copyfmt
- basic_ios::eof
- basic_ios::exceptions
- basic_ios::fail
- basic_ios::fill
- basic_ios::good
- basic_ios::imbue
- basic_ios::narrow
- basic_ios::operator bool
- basic_ios::operator!
- basic_ios::rdbuf
- basic_ios::rdstate
- basic_ios::setstate
- basic_ios::tie
- basic_ios::widen
protected members
- basic_ios::init
-
basic_ios::moveC++11
-
basic_ios::set_rdbufC++11
-
basic_ios::swapC++11
public member function
<ios> <iostream>
std::basic_ios::rdstate
iostate rdstate() const;
Get error state flags
The internal error state flags are automatically set by calls to input/output functions on the stream to signal certain errors.
Parameters
noneReturn Value
An object of type ios_base::iostate that can contain any combination of the following state flag member constants:| iostate value (member constants) | indicates | functions to check state flags | ||||
|---|---|---|---|---|---|---|
| good() | eof() | fail() | bad() | rdstate() | ||
| goodbit | No errors (zero value iostate) | true | false | false | false | goodbit |
| eofbit | End-of-File reached on input operation | false | true | false | false | eofbit |
| failbit | Logical error on i/o operation | false | false | true | false | failbit |
| badbit | Read/writing error on i/o operation | false | false | true | true | badbit |
goodbit is zero, indicating that none of the other bits is set.
Example
|
|
Data races
Accesses the stream object.Concurrent access to the same stream object may cause data races.
Exception safety
Strong guarantee: if an exception is thrown, there are no changes in the stream.See also
- basic_ios::fail
- Check whether failbit or badbit is set (public member function)
- basic_ios::good
- Check whether state of stream is good (public member function)
- basic_ios::bad
- Check whether badbit is set (public member function)
- basic_ios::eof
- Check whether eofbit is set (public member function)
- basic_ios::clear
- Set error state flags (public member function)
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Spotted an error? contact us