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Showing content from https://timsong-cpp.github.io/cppwp/n4140/wide.stream.objects below:

[wide.stream.objects]

27.4.3 Wide stream objects [wide.stream.objects]

wistream wcin;

The object wcin controls input from a stream buffer associated with the object stdin, declared in <cstdio>.

After the object wcin is initialized, wcin.tie() returns &wcout. Its state is otherwise the same as required for basic_ios<wchar_t>::init ([basic.ios.cons]).

wostream wcout;

The object wcout controls output to a stream buffer associated with the object stdout, declared in <cstdio> ([c.files]).

wostream wcerr;

The object wcerr controls output to a stream buffer associated with the object stderr, declared in <cstdio> ([c.files]).

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 ([basic.ios.cons]).

wostream wclog;

The object wclog controls output to a stream buffer associated with the object stderr, declared in <cstdio> ([c.files]).


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