700. N1856 defines struct identity

Section: 23.2.4 [forward] Status: CD1 Submitter: P.J. Plauger Opened: 2007-07-01 Last modified: 2016-02-10

Priority: Not Prioritized

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Discussion:

N1856 defines struct identity in <utility> which clashes with the traditional definition of struct identity in <functional> (not standard, but a common extension from old STL). Be nice if we could avoid this name clash for backward compatibility.

Proposed resolution:

Change 23.2.4 [forward]:

template <class T> struct identity
{
    typedef T type;
    const T& operator()(const T& x) const;
};
const T& operator()(const T& x) const;

Returns: x.