uintmax_t file_size(const path& p); uintmax_t file_size(const path& p, error_code& ec) noexcept;
Returns:
If !exists(p) an error is reported ([fs.err.report]).
Otherwise, if is_regular_file(p), the size in bytes of the file p resolves to, determined as if by the value of the POSIX stat structure member st_size obtained as if by POSIX stat().
The signature with argument ec returns static_cast<uintmax_t>(-1) if an error occurs.
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