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2029. Missing 'noexcept' on basic_regex move-assignment operator

Section: 32.7 [re.regex] Status: C++11 Submitter: Jonathan Wakely Opened: 2011-02-16 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

N3149 replaced the "Throws: nothing" clause on basic_regex::assign(basic_regex&&) with the noexcept keyword. The effects of the move-assignment operator are defined in terms of the assign() function, so the "Throws: nothing" applied there too, and a noexcept-specification should be added there too.

[2011-02-24 Reflector discussion]

Moved to Tentatively Ready after 7 votes.

Proposed resolution:

1. Modify the basic_regex synopsis in 32.7 [re.regex] p. 3:

   namespace std {
     template <class charT,
               class traits = regex_traits<charT> >
     class basic_regex {
     public:
       ...
       basic_regex& operator=(const basic_regex&);
       basic_regex& operator=(basic_regex&&) noexcept;
       basic_regex& operator=(const charT* ptr);
       ...
     };
   }
   

2. Modify 32.7.3 [re.regex.assign] p. 2:

   basic_regex& operator=(basic_regex&& e) noexcept;
   

   2 Effects: returns assign(std::move(e)).