tmp/tmp7vvje2b3/{from.md → to.md}
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#### Copy file <a id="fs.op.copy_file">[[fs.op.copy_file]]</a>
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``` cpp
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bool copy_file(const path& from, const path& to);
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bool copy_file(const path& from, const path& to, error_code& ec) noexcept;
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```
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*Returns:* `copy_file(from, to, copy_options::none)` or
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`copy_file(from, to, copy_options::none, ec)`, respectively.
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*Throws:* As specified in [[fs.err.report]].
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``` cpp
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bool copy_file(const path& from, const path& to, copy_options options);
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bool copy_file(const path& from, const path& to, copy_options options,
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error_code& ec) noexcept;
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```
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*Requires:* At most one element from each option group
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([[fs.enum.copy.opts]]) is set in `options`.
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*Effects:* As follows:
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- Report a file already exists error as specified in [[fs.err.report]]
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if:
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- `!is_regular_file(from)`, or
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- `exists(to)` and `!is_regular_file(to)`, or
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- `exists(to)` and `equivalent(from, to)`, or
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- `exists(to)` and
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``` cpp
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(options & (copy_options::skip_existing |
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copy_options::overwrite_existing |
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copy_options::update_existing)) == copy_options::none
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```
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- Otherwise, copy the contents and attributes of the file `from`
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resolves to, to the file `to` resolves to, if:
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- `!exists(to)`, or
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- `(options & copy_options::overwrite_existing) != copy_options::none`,
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or
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- `(options & copy_options::update_existing) `` `` != copy_options::none`
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and `from` is more recent than `to`, determined as if by use of the
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`last_write_time` function ([[fs.op.last_write_time]]).
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- Otherwise, no effects.
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*Returns:* `true` if the `from` file was copied, otherwise `false`. The
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signature with argument `ec` returns `false` if an error occurs.
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*Throws:* As specified in [[fs.err.report]].
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*Complexity:* At most one direct or indirect invocation of `status(to)`.
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