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cppdraft/ios/iostate.md

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+[ios.iostate]
+
+# 31 Input/output library [[input.output]](./#input.output)
+
+## 31.5 Iostreams base classes [[iostreams.base]](iostreams.base#ios.iostate)
+
+### 31.5.2 Class ios_base [[ios.base]](ios.base#ios.iostate)
+
+#### 31.5.2.2 Types [[ios.types]](ios.types#ios.iostate)
+
+#### 31.5.2.2.3 Type ios_base​::​iostate [ios.iostate]
+
+[🔗](#lib:iostate,ios_base)
+
+`using iostate = T2;
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1039)
+
+The typeiostate is a bitmask type ([[bitmask.types]](bitmask.types "16.3.3.3.3 Bitmask types"))
+that contains the elements indicated in Table [138](#tab:ios.iostate "Table 138: iostate effects")[.](#1.sentence-1)
+
+Table [138](#tab:ios.iostate) — iostate effects [[tab:ios.iostate]](./tab:ios.iostate)  
+
+| [🔗](#tab:ios.iostate-row-1)<br>**Element** | **Effect(s) if set** |
+| --- | --- |
+| [🔗](#tab:ios.iostate-row-2)<br>badbit | indicates a loss of integrity in an input or output sequence  (such as an irrecoverable read error from a file); |
+| [🔗](#tab:ios.iostate-row-3)<br>eofbit | indicates that an input operation reached the end of an input sequence; |
+| [🔗](#tab:ios.iostate-row-4)<br>failbit | indicates that an input operation failed to read the expected characters,  or that an output operation failed to generate the desired characters[.](#tab:ios.iostate-row-4-column-2-sentence-1) |
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L1056)
+
+Typeiostate also defines the constant:
+
+- [(2.1)](#2.1)
+
+goodbit,
+the value zero[.](#2.sentence-1)