std::bad_alloc is the type of the object thrown as exceptions by the allocation functions to report failure to allocate storage.
Inheritance diagram
[edit] Member functions constructs a newbad_alloc object
bad_alloc object
bad_alloc() throw();
(until C++11)bad_alloc() noexcept;
(since C++11)bad_alloc( const bad_alloc& other ) throw();
(until C++11)bad_alloc( const bad_alloc& other ) noexcept;
(since C++11)Constructs a new bad_alloc object with an implementation-defined null-terminated byte string which is accessible through what().
1) Default constructor.
2)Copy constructor.
If *this and other both have dynamic typestd::bad_alloc then std::strcmp(what(), other.what()) == 0.(since C++11) Parameters other - another exception object to copy std::bad_alloc::operator=
bad_alloc& operator=( const bad_alloc& other ) throw();
(until C++11)bad_alloc& operator=( const bad_alloc& other ) noexcept;
(since C++11)Assigns the contents with those of other. If *this and other both have dynamic type std::bad_alloc then std::strcmp(what(), other.what()) == 0 after assignment.(since C++11)
*this
std::bad_alloc::whatvirtual const char* what() const throw();
(until C++11)virtual const char* what() const noexcept;
(since C++11)Returns the explanatory string.
Return valuePointer to an implementation-defined null-terminated string with explanatory information. The string is suitable for conversion and display as a std::wstring. The pointer is guaranteed to be valid at least until the exception object from which it is obtained is destroyed, or until a non-const member function (e.g. copy assignment operator) on the exception object is called.
The returned string is encoded with the ordinary literal encoding during constant evaluation.
(since C++26) NotesImplementations are allowed but not required to override what().
std::exception) [edit] returns an explanatory string
std::exception) [edit] [edit] Notes [edit] Example
#include <iostream>
#include <new>
int main()
{
try
{
while (true)
{
new int[100000000ul];
}
}
catch (const std::bad_alloc& e)
{
std::cout << "Allocation failed: " << e.what() << '\n';
}
}
Possible output:
Allocation failed: std::bad_alloc[edit] See also
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