a POSIX file descriptor
| std_types::object | the prototype object for all "normal" objects |
| std::deserializer_of | constructs a file descriptor from a serialization string |
| std::is_a_file_descriptor | file descriptors are file descriptors |
| std::serialization_tag_of | the serialization tag for file descriptors |
| std::equal | compares two file descriptors for equality |
| std::get_terminal_size | retrieves the current width and height of the terminal |
| std::hash | returns an integer hash value for a file descriptor |
| std::load | loads data from a *file descriptor* |
| std::read | reads from a file |
| std::serialize | serializes a file descriptor |
| std::to_integer | returns an integer value representing the file descriptor |
| std::write | try to write the specified number of octets |