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##### Type `ios_base::openmode` <a id="ios.openmode">[[ios.openmode]]</a>
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``` cpp
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using openmode = T3;
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```
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The type `openmode` is a bitmask type [[bitmask.types]]. It contains the
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elements indicated in [[ios.openmode]].
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**Table: `openmode` effects** <a id="ios.openmode">[ios.openmode]</a>
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| Element | Effect(s) if set |
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| -------- | ----------------------------------------------------------------- |
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| `app` | seek to end before each write |
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| `ate` | open and seek to end immediately after opening |
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| `binary` | perform input and output in binary mode (as opposed to text mode) |
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| `in` | open for input |
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| `out` | open for output |
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| `trunc` | truncate an existing stream when opening |
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