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+[iostate.flags]
+
+# 31 Input/output library [[input.output]](./#input.output)
+
+## 31.5 Iostreams base classes [[iostreams.base]](iostreams.base#iostate.flags)
+
+### 31.5.4 Class template basic_ios [[ios]](ios#iostate.flags)
+
+#### 31.5.4.4 Flags functions [iostate.flags]
+
+[ð](#lib:operator_bool,basic_ios)
+
+`explicit operator bool() const;
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2236)
+
+*Returns*: !fail()[.](#1.sentence-1)
+
+[ð](#lib:operator!,basic_ios)
+
+`bool operator!() const;
+`
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2247)
+
+*Returns*: fail()[.](#2.sentence-1)
+
+[ð](#lib:rdstate,basic_ios)
+
+`iostate rdstate() const;
+`
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2258)
+
+*Returns*: The error state of the stream buffer[.](#3.sentence-1)
+
+[ð](#lib:clear,basic_ios)
+
+`void clear(iostate state = goodbit);
+`
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2269)
+
+*Effects*: If ((state | (rdbuf() ? goodbit : badbit)) & exceptions()) == 0,
+returns[.](#4.sentence-1)
+
+Otherwise, the function throws an object of classios_base::failure ([[ios.failure]](ios.failure "31.5.2.2.1 Class ios_base::failure")),
+constructed withimplementation-defined
+argument values[.](#4.sentence-2)
+
+[5](#5)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2279)
+
+*Postconditions*: Ifrdbuf() != 0 thenstate == rdstate();
+otherwiserdstate() == (state | ios_base::badbit)[.](#5.sentence-1)
+
+[ð](#lib:setstate,basic_ios)
+
+`void setstate(iostate state);
+`
+
+[6](#6)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2295)
+
+*Effects*: Callsclear(rdstate() | state) (which may throwios_base::failure ([[ios.failure]](ios.failure "31.5.2.2.1 Class ios_base::failure")))[.](#6.sentence-1)
+
+[ð](#lib:good,basic_ios)
+
+`bool good() const;
+`
+
+[7](#7)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2309)
+
+*Returns*: rdstate() == 0[.](#7.sentence-1)
+
+[ð](#lib:eof,basic_ios)
+
+`bool eof() const;
+`
+
+[8](#8)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2320)
+
+*Returns*: true ifeofbit is set inrdstate()[.](#8.sentence-1)
+
+[ð](#lib:fail,basic_ios)
+
+`bool fail() const;
+`
+
+[9](#9)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2335)
+
+*Returns*: true iffailbit orbadbit is set inrdstate()[.](#9.sentence-1)[264](#footnote-264 "Checking badbit also for fail() is historical practice.")
+
+[ð](#lib:bad,basic_ios)
+
+`bool bad() const;
+`
+
+[10](#10)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2359)
+
+*Returns*: true ifbadbit is set inrdstate()[.](#10.sentence-1)
+
+[ð](#lib:exceptions,basic_ios)
+
+`iostate exceptions() const;
+`
+
+[11](#11)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2374)
+
+*Returns*: A mask that determines what elements set inrdstate() cause exceptions to be thrown[.](#11.sentence-1)
+
+[ð](#lib:exceptions,basic_ios_)
+
+`void exceptions(iostate except);
+`
+
+[12](#12)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2387)
+
+*Effects*: Callsclear(rdstate())[.](#12.sentence-1)
+
+[13](#13)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L2392)
+
+*Postconditions*: except == exceptions()[.](#13.sentence-1)
+
+[264)](#footnote-264)[264)](#footnoteref-264)
+
+Checkingbadbit also forfail() is historical practice[.](#footnote-264.sentence-1)