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Showing content from https://cplusplus.github.io/LWG/issue2342 below:

User conversion to wchar_t const* or to wchar_t not invoked for operator<<

Modify 31.7.6.3.4 [ostream.inserters.character] as indicated: [Drafting note: The replacement of os by out in p1 and the insertion of "out." in p4 just fix two obvious typos — end drafting note]

template<class charT, class traits>
  basic_ostream<charT,traits>& operator<<(basic_ostream<charT,traits>& out,
                                          charT c);
template<class charT, class traits>
  basic_ostream<charT,traits>& operator<<(basic_ostream<charT,traits>& out,
                                          char c);
// specialization
template<class traits>
  basic_ostream<char,traits>& operator<<(basic_ostream<char,traits>& out,
                                         char c);
template<class traits>
  basic_ostream<wchar_t,traits>& operator<<(basic_ostream<wchar_t,traits>& out,
                                            wchar_t c);

// signed and unsigned
template<class traits>
  basic_ostream<char,traits>& operator<<(basic_ostream<char,traits>& out,
                                          signed char c);
template<class traits>
  basic_ostream<char,traits>& operator<<(basic_ostream<char,traits>& out,
                                          unsigned char c);

-1- Effects: Behaves as a formatted output function (31.7.6.3.1 [ostream.formatted.reqmts]) of out. Constructs a character sequence seq. If c has type char and the character type of the stream is not char, then seq consists of out.widen(c); otherwise seq consists of c. Determines padding for seq as described in 31.7.6.3.1 [ostream.formatted.reqmts]. Inserts seq into out. Calls os out.width(0).

-2- Returns: out.

template<class charT, class traits>
  basic_ostream<charT,traits>& operator<<(basic_ostream<charT,traits>& out,
                                          const charT* s);
template<class charT, class traits>
  basic_ostream<charT,traits>& operator<<(basic_ostream<charT,traits>& out,
                                          const char* s);
template<class traits>
  basic_ostream<char,traits>& operator<<(basic_ostream<char,traits>& out,
                                         const char* s);
template<class traits>
  basic_ostream<wchar_t,traits>& operator<<(basic_ostream<wchar_t,traits>& out,
                                            const wchar_t* s);
											
template<class traits>
  basic_ostream<char,traits>& operator<<(basic_ostream<char,traits>& out,
                                         const signed char* s);
template<class traits>
  basic_ostream<char,traits>& operator<<(basic_ostream<char,traits>& out,
                                         const unsigned char* s);

-3- Requires: s shall not be a null pointer.

-4- Effects: Behaves like a formatted inserter (as described in 31.7.6.3.1 [ostream.formatted.reqmts]) of out. Creates a character sequence seq of n characters starting at s, each widened using out.widen() (27.5.5.3), where n is the number that would be computed as if by:

• traits::length(s) for the following overload s:

  • where the first argument is of type basic_ostream<charT, traits>& and the second is of type const charT*,

  • and also for the overload where the first argument is of type basic_ostream<char, traits>& and the second is of type const char*,

  • where the first argument is of type basic_ostream<wchar_t, traits>& and the second is of type const wchar_t*,

• std::char_traits<char>::length(s) for the overload where the first argument is of type basic_ostream<charT, traits>& and the second is of type const char*,

• traits::length(reinterpret_cast<const char*>(s)) for the other two overloads.

Determines padding for seq as described in 31.7.6.3.1 [ostream.formatted.reqmts]. Inserts seq into out. Calls out.width(0).

-5- Returns: out.

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