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[wide.stream.objects]
# 31 Input/output library [[input.output]](./#input.output)
## 31.4 Standard iostream objects [[iostream.objects]](iostream.objects#wide.stream.objects)
### 31.4.4 Wide stream objects [wide.stream.objects]
[🔗](#lib:wcin)
`wistream wcin;
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L615)
The object wcin controls input from a stream buffer associated with the object stdin,
declared in [<cstdio>](cstdio.syn#header:%3ccstdio%3e "31.13.1 Header <cstdio> synopsis [cstdio.syn]")[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L620)
After the objectwcin is initialized,wcin.tie() returns&wcout[.](#2.sentence-1)
Its state is otherwise the same as required for[basic_ios<wchar_t>​::​init](istream.cons#lib:basic_ios,init "31.7.5.2.2 Constructors [istream.cons]")[.](#2.sentence-2)
[🔗](#lib:wcout)
`wostream wcout;
`
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L637)
The object wcout controls output to a stream buffer associated with the object stdout,
declared in [<cstdio>](cstdio.syn#header:%3ccstdio%3e "31.13.1 Header <cstdio> synopsis [cstdio.syn]")[.](#3.sentence-1)
[🔗](#lib:wcerr)
`wostream wcerr;
`
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L649)
The object wcerr controls output to a stream buffer associated with the object stderr,
declared in [<cstdio>](cstdio.syn#header:%3ccstdio%3e "31.13.1 Header <cstdio> synopsis [cstdio.syn]")[.](#4.sentence-1)
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L654)
After the objectwcerr is initialized,wcerr.flags() & unitbuf is nonzero and wcerr.tie() returns &wcout[.](#5.sentence-1)
Its state is otherwise the same as required for[basic_ios<wchar_t>​::​init](istream.cons#lib:basic_ios,init "31.7.5.2.2 Constructors [istream.cons]")[.](#5.sentence-2)
[🔗](#lib:wclog)
`wostream wclog;
`
[6](#6)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L670)
The object wclog controls output to a stream buffer associated with the object stderr,
declared in [<cstdio>](cstdio.syn#header:%3ccstdio%3e "31.13.1 Header <cstdio> synopsis [cstdio.syn]")[.](#6.sentence-1)