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### 331. bad declaration of destructor for ios_base::failure

Section: 29.5.2.2.1 [ios.failure] Status: CD1 Submitter: PremAnand M. Rao Opened: 2001-08-23 Last modified: 2021-06-06

Priority: Not Prioritized

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Discussion:

With the change in 16.4.6.13 [res.on.exception.handling] to state "An implementation may strengthen the exception-specification for a non-virtual function by removing listed exceptions." (issue 119) and the following declaration of ~failure() in ios_base::failure

        namespace std {
           class ios_base::failure : public exception {
           public:
               ...
               virtual ~failure();
               ...
           };
         }

the class failure cannot be implemented since in 17.7.3 [type.info] the destructor of class exception has an empty exception specification:

        namespace std {
           class exception {
           public:
             ...
             virtual ~exception() throw();
             ...
           };
         }

Proposed resolution:

Remove the declaration of ~failure().

Rationale:

The proposed resolution is consistent with the way that destructors of other classes derived from `exception` are handled.