29 Input/output library [input.output]

29.11 File systems [filesystems]

29.11.13 Filesystem operation functions [fs.op.funcs] Is block file [fs.op.is.block.file]

bool is_block_file(file_status s) noexcept;
Returns: s.type() == file_­type​::​block.
bool is_block_file(const path& p); bool is_block_file(const path& p, error_code& ec) noexcept;
Returns: is_­block_­file(status(p)) or is_­block_­file(status(p, ec)), respectively.
The signature with argument ec returns false if an error occurs.
Throws: As specified in [fs.err.report].