std::bad_alloc

 

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operator newoperator new[]

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bad_alloc

bad_array_new_length (C++11)

nothrow_t

align_val_t (C++17)

destroying_delete_t (C++20)

Types

new_handler

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nothrow

 

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 the bad_alloc object (public member function)
operator=	replaces a bad_alloc object (public member function)
what	returns explanatory string (public member function)

std::bad_alloc::bad_alloc

bad_alloc() throw();		(until C++11)
bad_alloc() noexcept;		(since C++11)

Constructs new bad_alloc object with an implementation-defined null-terminated byte string which is accessible through what().

Parameters

(none)

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 of other.

Parameters

other

-

another exception object to assign

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.

Inherited from std::exception

Member functions

(destructor) [virtual]	destroys the exception object (virtual public member function of std::exception)
what [virtual]	returns an explanatory string (virtual public member function of std::exception)

Example

Run this code

#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

operator newoperator new[]

allocation functions (function)