-=head1 RETURN VALUES
-
-d2i_TYPE(), d2i_TYPE_bio() and d2i_TYPE_fp() return a valid B<TYPE> structure
-or B<NULL> if an error occurs. If the "reuse" capability has been used with
-a valid structure being passed in via B<a>, then the object is not freed in
-the event of error but may be in a potentially invalid or inconsistent state.
-
-i2d_TYPE() returns the number of bytes successfully encoded or a negative
-value if an error occurs.
-
-i2d_TYPE_bio() and i2d_TYPE_fp() return 1 for success and 0 if an error
-occurs.
-