C++ IOS Library - bad

Description

It is used to check whether badbit is set. 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`

Declaration

Following is the declaration for ios::bad function.

bool bad() const;

Parameters

none

Return Value

True if the stream's badbit error state flag is set or else false.

Exceptions

Strong guarantee − if an exception is thrown, there are no changes in the stream.

Data Races

Accesses the stream object.

Concurrent access to the same stream object may cause data races.

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