std::bad_alloc - cppreference.com

Inheritance diagram

Contents

• 1 Member functions
• 2 std::bad_alloc::bad_alloc
  • 2.1 Parameters
• 3 std::bad_alloc::operator=
  • 3.1 Parameters
  • 3.2 Return value
• 4 std::bad_alloc::what
  • 4.1 Return value
  • 4.2 Notes
• 5 Inherited from std::exception
  • 5.1 Member functions
  • 5.2 Notes
  • 5.3 Example
  • 5.4 See also

std::bad_alloc::bad_alloc

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 type std::bad_alloc then std::strcmp(what(), other.what()) == 0.(since C++11)

Parameters

std::bad_alloc::operator=

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

Return value

*this

std::bad_alloc::what

Returns the explanatory string.

Return value

Pointer 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.

Notes

Implementations are allowed but not required to override what().

Inherited from std::exception

Member functions

#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