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##### Type `ios_base::iostate` <a id="ios.iostate">[[ios.iostate]]</a>
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``` cpp
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using iostate = T2;
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```
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The type `iostate` is a bitmask type [[bitmask.types]] that contains the
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elements indicated in [[ios.iostate]].
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**Table: `iostate` effects** <a id="ios.iostate">[ios.iostate]</a>
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| Element | Effect(s) if set |
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| --------- | ------------------------------------------------------------------------------------------------------------------------------------------------ |
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| `badbit` | indicates a loss of integrity in an input or output sequence (such as an irrecoverable read error from a file); |
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| `eofbit` | indicates that an input operation reached the end of an input sequence; |
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| `failbit` | indicates that an input operation failed to read the expected characters, or that an output operation failed to generate the desired characters. |
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Type `iostate` also defines the constant:
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- `goodbit`, the value zero.
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