Appendix B. Item Mappings Between Second and Third Editions

The tables show a mapping of information, not text. For example, the ideas in Item 39 of the second edition ("Avoid casts down the inheritance hierarchy") are now found in Item 27 of the current edition ("Minimize casting"), even though the third edition text and examples for that Item are entirely new. A more extreme example involves the second edition's Item 18 ("Strive for class interfaces that are complete and minimal"). One of the primary conclusions of that Item was that prospective member functions that need no special access to the non-public parts of the class should generally be non-members. In the third edition, that same result is reached via different (stronger) reasoning, so Item 18 in the second edition maps to Item 23 in the third edition ("Prefer non-member non-friend functions to member functions"), even though about the only thing the two Items have in common is their conclusion.

Second Edition to Third Edition

2nd Ed.	3rd Ed.	2nd Ed.	3rd Ed.	2nd Ed.	3rd Ed.
1	2	18	23	35	32
2	—	19	24	36	34
3	—	20	22	37	36
4	—	21	3	38	37
5	16	22	20	39	27
6	13	23	21	40	38
7	49	24	—	41	41
8	51	25	—	42	39,44
9	52	26	—	43	40
10	50	27	6	44	—
11	14	28	—	45	5
12	4	29	28	46	18
13	4	30	28	47	4
14	7	31	21	48	53
15	10	32	26	49	54
16	12	33	30	50	—
17	11	34	31

Third Edition to Second Edition

3rd Ed.	2nd Ed.	3rd Ed.	2nd Ed.	3rd Ed.	2nd Ed.
1	—	20	22	39	42
2	1	21	23,31	40	43
3	21	22	20	41	41
4	12,13,47	23	18	42	—
5	45	24	19	43	—
6	27	25	—	44	42
7	14	26	32	45	—
8	—	27	39	46	—
9	—	28	29,30	47	—
10	15	29	—	48	—
11	17	30	33	49	7
12	16	31	34	50	10
13	6	32	35	51	8
14	11	33	9	52	9
15	—	34	36	53	48
16	5	35	—	54	49
17	—	36	37	55	—
18	46	37	38
19	pp.77–79	38	40