std::bad_alloc (3) Linux Manual Page

std::bad_alloc – std::bad_alloc

Synopsis

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.
 std-bad alloc-inheritance.svg
Inheritance diagram

Member functions

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

 std::bad_alloc::bad_alloc

bad_alloc();

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

Parameters

(none)

Exceptions

(none) (until C++11)
noexcept specification: (since C++11)
noexcept

 std::bad_alloc::operator=

bad_alloc& operator=( const bad_alloc& other );

Assigns the contents of other.

Parameters

other – another exception object to assign

Return value

*this

Exceptions

(none) (until C++11)
noexcept specification: (since C++11)
noexcept

 std::bad_alloc::what

virtual const char* what() const;

Returns the explanatory string.

Parameters

(none)

Return value

Pointer to a null-terminated string with explanatory information.

Exceptions

(none) (until C++11)
noexcept specification: (since C++11)
noexcept

Inherited from std::exception

Member functions

destructor destroys the exception object
             (virtual public member function of std::exception)
[virtual]

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

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

               allocation functions
operator_new (function)
operator_new[]