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/C++std::bad_alloc
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().
*this and other both have dynamic type 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) |
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.
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) |
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) |
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https://en.cppreference.com/w/cpp/memory/new/bad_alloc