30 Input/output library [input.output]

30.11 File systems [filesystems]

30.11.14 Filesystem operation functions [fs.op.funcs]

30.11.14.14 File size [fs.op.file_size]

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uintmax_t file_size(const path& p); uintmax_t file_size(const path& p, error_code& ec) noexcept;
1
#
Effects: If exists(p) is false, an error is reported ([fs.err.report]).
2
#
Returns:
  • (2.1)
    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().
  • (2.2)
    Otherwise, the result is implementation-defined.
The signature with argument ec returns static_­cast<uintmax_­t>(-1) if an error occurs.
3
#
Throws: As specified in [fs.err.report].