+.PP
+Keyword arguments for the initialization message may be provided.
+The macro expects a single preprocessor-time argument
+which is a use of one of
+.B KWARGS
+or
+.B NO_KWARGS
+(see
+.BR keyword (3)).
+.PP
+The instance has automatic storage duration:
+pointers to it will become invalid
+when control exits the scope of the declaration.
+If necessary,
+the instance should be torn down before this happens,
+using the
+.B sod_teardown
+function.
+It may be appropriate to
+.BR assert (3)
+that the object is ready for deallocation at this time.
+.PP
+By default, this macro will abort the program
+if the size allocated for the instance doesn't match
+the size required by the class object;
+set
+.B SOD_RECKLESS
+to inhibit this check.
+.PP
+The
+.B SOD_MAKE
+macro,
+and the
+.B sod_make
+and
+.B sod_makev
+functions,
+construct and return a pointer to a new instance of a class.
+.PP
+The direct class for the new instance is specified as a class name to
+.BR SOD_MAKE ,
+or as a class object to the functions.
+.PP
+Keyword arguments for the initialization message may be provided.
+The
+.B SOD_MAKE
+macro expects a single preprocessor-time argument
+which is a use of one of
+.B KWARGS
+or
+.B NO_KWARGS
+(see
+.BR keyword (3));
+the
+.B sod_init
+function expects the keywords as
+a variable-length argument tail;
+and
+.B sod_makev
+expects the keywords to be passed indirectly,
+through the captured argument-tail cursor
+.IR ap .
+.PP
+Storage for the new instance will have been allocated
+using the standard
+.BR malloc (3)
+function.
+The easiest way to destroy the instance,
+when it is no longer needed,
+is probably to call the
+.B sod_destroy
+function.
+.PP
+The return value is an instance pointer for the class
+.IR cls ;
+the
+.B SOD_MAKE
+macro will have converted it to the correct type,
+so it should probably be used where possible.
+.PP
+The
+.B sod_destroy
+function tears down and frees an instance allocated using
+.BR malloc (3).
+.PP
+The pointer
+.I p
+should be an instance pointer,
+i.e., a pointer to any of an instance's chains.
+The instance is torn down,
+by sending it the
+.B obj.teardown
+message.
+If the instance reports itself ready for deallocation,
+then its storage is released using
+.BR free (3).
+The return value is the value returned by the
+.B obj.teardown
+message.