[fmtflags.state]

# 31 Input/output library [[input.output]](./#input.output)

## 31.5 Iostreams base classes [[iostreams.base]](iostreams.base#fmtflags.state)

### 31.5.2 Class ios_base [[ios.base]](ios.base#fmtflags.state)

#### 31.5.2.3 State functions [fmtflags.state]

[🔗](#lib:flags,ios_base)

`fmtflags flags() const;
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1188)

*Returns*: The format control information for both input and output[.](#1.sentence-1)

[🔗](#lib:flags,ios_base_)

`fmtflags flags(fmtflags fmtfl);
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1199)

*Postconditions*: fmtfl == flags()[.](#2.sentence-1)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1203)

*Returns*: The previous value offlags()[.](#3.sentence-1)

[🔗](#lib:setf,ios_base)

`fmtflags setf(fmtflags fmtfl);
`

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1215)

*Effects*: Sets fmtfl inflags()[.](#4.sentence-1)

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1220)

*Returns*: The previous value offlags()[.](#5.sentence-1)

[🔗](#lib:setf,ios_base_)

`fmtflags setf(fmtflags fmtfl, fmtflags mask);
`

[6](#6)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1232)

*Effects*: Clears mask inflags(),
setsfmtfl & mask inflags()[.](#6.sentence-1)

[7](#7)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1241)

*Returns*: The previous value offlags()[.](#7.sentence-1)

[🔗](#lib:unsetf,ios_base)

`void unsetf(fmtflags mask);
`

[8](#8)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1253)

*Effects*: Clears mask inflags()[.](#8.sentence-1)

[🔗](#lib:precision,ios_base)

`streamsize precision() const;
`

[9](#9)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1265)

*Returns*: The precision
to generate on certain output conversions[.](#9.sentence-1)

[🔗](#lib:precision,ios_base_)

`streamsize precision(streamsize prec);
`

[10](#10)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1277)

*Postconditions*: prec == precision()[.](#10.sentence-1)

[11](#11)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1281)

*Returns*: The previous value ofprecision()[.](#11.sentence-1)

[🔗](#lib:width,ios_base)

`streamsize width() const;
`

[12](#12)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1293)

*Returns*: The minimum field width (number of characters) to generate on certain output
conversions[.](#12.sentence-1)

[🔗](#lib:width,ios_base_)

`streamsize width(streamsize wide);
`

[13](#13)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1305)

*Postconditions*: wide == width()[.](#13.sentence-1)

[14](#14)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1309)

*Returns*: The previous value ofwidth()[.](#14.sentence-1)