[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)