public member function

std::basic_ios::bad

bool bad() const;

Check whether badbit is set

Returns true if the badbit error state flag is set for the stream.

This flag is set by operations performed on the stream when an error occurs while read or writing data, generally causing the loss of integrity of the stream.

Notice that this function is not the exact opposite of good , which checks whether none of the error flags (eofbit, failbit and badbit) are set, and not only badbit:

`iostate` value (member constants)	indicates	functions to check state flags
`iostate` value (member constants)	indicates	`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`

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.

Parameters

none

Return Value

true if the stream's badbit error state flag is set.
false otherwise.

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.

types

manipulators

other functions

public members

protected members

std::basic_ios::bad

Parameters

Return Value

Data races

Exception safety

See also