31 Input/output library [input.output]

31.4 Standard iostream objects [iostream.objects]

31.4.4 Wide stream objects [wide.stream.objects]

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wistream wcin;
1
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The object wcin controls input from a stream buffer associated with the object stdin, declared in <cstdio>.
2
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After the object wcin is initialized, wcin.tie() returns &wcout.
Its state is otherwise the same as required for basic_ios<wchar_t>​::​init.
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wostream wcout;
3
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The object wcout controls output to a stream buffer associated with the object stdout, declared in <cstdio>.
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wostream wcerr;
4
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The object wcerr controls output to a stream buffer associated with the object stderr, declared in <cstdio>.
5
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After the object wcerr is initialized, wcerr.flags() & unitbuf is nonzero and wcerr.tie() returns &wcout.
Its state is otherwise the same as required for basic_ios<wchar_t>​::​init.
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wostream wclog;
6
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The object wclog controls output to a stream buffer associated with the object stderr, declared in <cstdio>.