This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of NAD Editorial status.

### 3033. `basic_string` move ctor is underspecified

Section: 21.3.3.3 [string.cons] Status: NAD Editorial Submitter: Peter Sommerlad Opened: 2017-11-09 Last modified: 2017-11-29

Priority: Not Prioritized

View all other issues in [string.cons].

View all issues with NAD Editorial status.

Discussion:

The standard has a hole in the specification of `basic_string`'s move constructor that seems not only be editorial. In 21.3.3.3 [string.cons] p2:

>     basic_string(const basic_string& str);
>     basic_string(basic_string&& str) noexcept;

> > Effects: Constructs an object of class `basic_string` as indicated in Table 56. In the second form, `str` is left in a valid state with an unspecified value.

refers to Table 56, but that table only speaks about copy-ctor. According to Pablo, move and copy differ in what they do. Move ctor of `basic_string` needs separate table (entry) to describe what happens.

[28-Nov-2017 After discussion on the ML, closing as NAD Editorial]

Proposed resolution: