30 lines
1.0 KiB
Markdown
30 lines
1.0 KiB
Markdown
[bad.cast]
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# 17 Language support library [[support]](./#support)
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## 17.7 Type identification [[support.rtti]](support.rtti#bad.cast)
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### 17.7.4 Class bad_cast [bad.cast]
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[ð](#lib:bad_cast)
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namespace std {class bad_cast : public exception {public:// see [[exception]](exception "17.9.3 Class exception") for the specification of the special member functionsconstexpr const char* what() const noexcept override; };}
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3401)
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The classbad_cast defines the type of objects thrown
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as exceptions by the implementation to report the execution of an invaliddynamic_cast expression ([[expr.dynamic.cast]](expr.dynamic.cast "7.6.1.7 Dynamic cast"))[.](#1.sentence-1)
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[ð](#lib:what,bad_cast)
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`constexpr const char* what() const noexcept override;
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`
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3416)
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*Returns*: An implementation-defined ntbs[.](#2.sentence-1)
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