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### 1190. Setting the maximum load factor should return the previous value

Section: 24.2.8 [unord.req], 24.5 [unord] Status: NAD Submitter: Matt Austern Opened: 2009-08-10 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

The unordered associative container requirements table specifies that `a.set_max_load_factor(z)` has return type `void`. However, there is a useful piece of information to return: the previous value. Users who don't need it can always ignore it.

[ 2010 Rapperswil: ]

> The benefit seems minor, while breaking with the getter/setter idiom these overloads support. Move to Tentatively NAD.

[ Moved to NAD at 2010-11 Batavia ]

Proposed resolution:

In the unordered associative container requirements table, change:

> Table 87 — Unordered associative container requirements (in addition to container)
> Expression | Return type | Assertion/note pre-/post-condition | Complexity
> --- | --- | --- | ---
> `a.max_load_factor(z)` | `void float` | Pre: `z` shall be positive. Changes the container's maximum load load factor, using `z` as a hint. Returns: the previous value of `a.max_load_factor()`. | constant

Change the return type of `set_max_load_factor` in the class synopses in 24.5.4 [unord.map], 24.5.5 [unord.multimap], 24.5.6 [unord.set], and 24.5.7 [unord.multiset].

If issue 1188 is also accepted, make the same changes for `min_load_factor`.