# std::bad_array_new_length

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< cpp‎ | memory‎ | new

Defined in header `<new>` |  |
class bad_array_new_length; |  | (since C++11)

`std::bad_array_new_length` is the type of the object thrown as exceptions by the new-expressions to report invalid array lengths if

1) array length is negative

2) total size of the new array would exceed implementation-defined maximum value

3) the number of initializer-clauses exceeds the number of elements to initialize

Only the first array dimension may generate this exception; dimensions other than the first are constant expressions and are checked at compile time.

Inheritance diagram

### Member functions

(constructor) | constructs the `bad_array_new_length` object (public member function)

## Inherited from std::bad_alloc

## 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`)

### Notes

The override for the virtual member function `what()` may by provided, but is not required.

### Example

Three conditions where std::bad_array_new_length should be thrown:

Run this code

    #include <iostream>
    #include <new>
    #include <climits>

    int main()
    {
        int negative = -1;
        int small = 1;
        int large = INT_MAX;
        try {
            new int[negative];           // negative size
            new int[small]{1,2,3};       // too many initializers
            new int[large][1000000];     // too large
        } catch(const std::bad_array_new_length &e) {
            std::cout << e.what() << '\n';
        }
    }

### See also

operator new operator new[] | allocation functions (function)
bad_alloc | exception thrown when memory allocation fails (class)

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