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cppdraft/underflow/error.md

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+[underflow.error]
+
+# 19 Diagnostics library [[diagnostics]](./#diagnostics)
+
+## 19.2 Exception classes [[std.exceptions]](std.exceptions#underflow.error)
+
+### 19.2.11 Class underflow_error [underflow.error]
+
+[🔗](#lib:underflow_error)
+
+namespace std {class underflow_error : public runtime_error {public:constexpr explicit underflow_error(const string& what_arg); constexpr explicit underflow_error(const char* what_arg); };}
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/diagnostics.tex#L421)
+
+The classunderflow_error defines the type of objects thrown as exceptions to report an arithmetic underflow error[.](#1.sentence-1)
+
+[🔗](#lib:underflow_error,constructor)
+
+`constexpr underflow_error(const string& what_arg);
+`
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/diagnostics.tex#L432)
+
+*Postconditions*: strcmp(what(), what_arg.c_str()) == 0[.](#2.sentence-1)
+
+[🔗](#lib:underflow_error,constructor_)
+
+`constexpr underflow_error(const char* what_arg);
+`
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/diagnostics.tex#L443)
+
+*Postconditions*: strcmp(what(), what_arg) == 0[.](#3.sentence-1)