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[bad.alloc]
# 17 Language support library [[support]](./#support)
## 17.6 Dynamic memory management [[support.dynamic]](support.dynamic#bad.alloc)
### 17.6.4 Storage allocation errors [[alloc.errors]](alloc.errors#bad.alloc)
#### 17.6.4.1 Class bad_alloc [bad.alloc]
[🔗](#lib:bad_alloc,constructor)
namespace std {class bad_alloc : public exception {public:// see [[exception]](exception "17.9.3Class exception") for the specification of the special member functionsconstexpr const char* what() const noexcept override; };}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3031)
The classbad_alloc defines the type of objects thrown as
exceptions by the implementation to report a failure to allocate storage[.](#1.sentence-1)
[🔗](#lib:what,bad_alloc)
`constexpr const char* what() const noexcept override;
`
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3043)
*Returns*: An implementation-defined ntbs[.](#2.sentence-1)

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

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[bad.exception]
# 17 Language support library [[support]](./#support)
## 17.9 Exception handling [[support.exception]](support.exception#bad.exception)
### 17.9.4 Class bad_exception [bad.exception]
[🔗](#lib:bad_exception)
namespace std {class bad_exception : public exception {public:// see [[exception]](exception "17.9.3Class exception") for the specification of the special member functionsconstexpr const char* what() const noexcept override; };}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3981)
The classbad_exception defines the type of the object
referenced by the exception_ptr returned from a call to current_exception ([[propagation]](propagation "17.9.7Exception propagation"))
when the currently active exception object fails to copy[.](#1.sentence-1)
[🔗](#lib:what,bad_exception)
`constexpr const char* what() const noexcept override;
`
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3995)
*Returns*: An implementation-defined ntbs[.](#2.sentence-1)

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[bad.typeid]
# 17 Language support library [[support]](./#support)
## 17.7 Type identification [[support.rtti]](support.rtti#bad.typeid)
### 17.7.5 Class bad_typeid [bad.typeid]
[🔗](#lib:bad_typeid)
namespace std {class bad_typeid : public exception {public:// see [[exception]](exception "17.9.3Class exception") for the specification of the special member functionsconstexpr const char* what() const noexcept override; };}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3435)
The classbad_typeid defines the type of objects
thrown as exceptions by the implementation to report a null pointer
in atypeid expression ([[expr.typeid]](expr.typeid "7.6.1.8Type identification"))[.](#1.sentence-1)
[🔗](#lib:what,bad_typeid)
`constexpr const char* what() const noexcept override;
`
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3450)
*Returns*: An implementation-defined ntbs[.](#2.sentence-1)