29 lines
1.2 KiB
Markdown
29 lines
1.2 KiB
Markdown
[optional.bad.access]
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# 22 General utilities library [[utilities]](./#utilities)
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## 22.5 Optional objects [[optional]](optional#bad.access)
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### 22.5.6 Class bad_optional_access [optional.bad.access]
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namespace std {class bad_optional_access : 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/utilities.tex#L5018)
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The class bad_optional_access defines the type of objects thrown as exceptions to report the situation where an attempt is made to access the value of an optional object that does not contain a value[.](#1.sentence-1)
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[ð](#lib:what,bad_optional_access)
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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/utilities.tex#L5027)
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*Returns*: An implementation-defined ntbs,
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which during constant evaluation is encoded with
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the ordinary literal encoding ([[lex.ccon]](lex.ccon "5.13.3 Character literals"))[.](#2.sentence-1)
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