Dear C++ committee,

In "28.9.2 sub_match non-member operators [re.submatch.op]" of N2284,
operator functions numbered 31-42 seem impossible to compare.  E.g.:

  template <class BiIter>
    bool operator==(typename iterator_traits<BiIter>::value_type const& lhs,
                    const sub_match<BiIter>& rhs);

  31 Returns: lhs == rhs.str().

When char* is used as BiIter, iterator_traits<BiIter>::value_type would be
char, so that lhs == rhs.str() ends up comparing a char value and an object
of std::basic_string<char>.  However, the behaviour of comparison between
these two types is not defined in "21.3.8 basic_string non-member functions
[string.nonmembers]" of N2284.  This applies when wchar_t* is used as BiIter.

Sincerely,

--
Nozomu Katoo <nzm-mm@tsuki.jpn.org>

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