tmp/tmpz56ahzzk/{from.md → to.md}
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#### File size <a id="fs.op.file_size">[[fs.op.file_size]]</a>
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``` cpp
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uintmax_t file_size(const path& p);
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uintmax_t file_size(const path& p, error_code& ec) noexcept;
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```
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*Returns:*
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- If `!exists(p)` an error is reported ([[fs.err.report]]).
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- Otherwise, if `is_regular_file(p)`, the size in bytes of the file `p`
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resolves to, determined as if by the value of the POSIX `stat`
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structure member `st_size` obtained as if by POSIX `stat()`.
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- Otherwise, the result is *implementation-defined*.
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The signature with argument `ec` returns `static_cast<uintmax_t>(-1)` if
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an error occurs.
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*Throws:* As specified in [[fs.err.report]].
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