31 Input/output library [input.output]

31.12 File systems [filesystems]

31.12.13 Filesystem operation functions [fs.op.funcs]

31.12.13.15 File size [fs.op.file.size]

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uintmax_t filesystem::file_size(const path& p); uintmax_t filesystem::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 class 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].