tmp/tmps5vw9lew/{from.md → to.md}
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#### Permissions <a id="fs.op.permissions">[[fs.op.permissions]]</a>
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``` cpp
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void permissions(const path& p, perms prms, perm_options opts=perm_options::replace);
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void permissions(const path& p, perms prms, error_code& ec) noexcept;
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void permissions(const path& p, perms prms, perm_options opts, error_code& ec);
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```
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*Requires:* Exactly one of the `perm_options` constants `replace`,
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`add`, or `remove` is present in `opts`.
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*Remarks:* The second signature behaves as if it had an additional
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parameter `perm_options` `opts` with an argument of
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`perm_options::replace`.
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*Effects:* Applies the action specified by `opts` to the file `p`
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resolves to, or to file `p` itself if `p` is a symbolic link and
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`perm_options::nofollow` is set in `opts`. The action is applied as if
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by POSIX `fchmodat()`.
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[*Note 1*: Conceptually permissions are viewed as bits, but the actual
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implementation may use some other mechanism. — *end note*]
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*Throws:* As specified in [[fs.err.report]].
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