std:: bad_alloc
|
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Functions | ||||
|
(C++11)
|
||||
| Classes | ||||
|
bad_alloc
|
||||
|
(C++11)
|
||||
|
(C++17)
|
||||
| Types | ||||
| Objects | ||||
|
(C++20)
|
||||
| Object access | ||||
|
(C++17)
|
|
Defined in header
<new>
|
||
|
class
bad_alloc
;
|
||
std::bad_alloc
is the type of the object thrown as exceptions by the
allocation functions
to report failure to allocate storage.
Inheritance diagram
Member functions
|
(constructor)
|
constructs a new
bad_alloc
object
(public member function) |
|
operator=
|
replaces the
bad_alloc
object
(public member function) |
|
what
|
returns the explanatory string
(public member function) |
std::bad_alloc:: bad_alloc
| (1) | ||
|
bad_alloc
(
)
throw
(
)
;
|
(until C++11) | |
|
bad_alloc
(
)
noexcept
;
|
(since C++11) | |
| (2) | ||
|
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()
.
std::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)
Parameters
| other | - | another exception object to assign with |
Return value
* this
std::bad_alloc:: what
|
virtual
const
char
*
what
(
)
const
throw
(
)
;
|
(until C++11) | |
|
virtual
const
char
*
what
(
)
const
noexcept
;
|
(since C++11)
(constexpr since C++26) |
|
Returns the explanatory string.
Parameters
(none)
Return value
Pointer to a 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) |
Notes
Implementations are allowed but not required to override
what()
.
Inherited from std:: exception
Member functions
|
[virtual]
|
destroys the exception object
(virtual public member function of
std::exception
)
|
|
[virtual]
|
returns an explanatory string
(virtual public member function of
std::exception
)
|
Notes
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_constexpr_exceptions
|
202411L | (C++26) | constexpr for exception types |
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
See also
|
allocation functions
(function) |