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std::bad_array_new_length

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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.

cpp/error/exceptioncpp/memory/new/bad allocstd-bad array new length-inheritance.svg
About this image

Inheritance diagram

Contents

[edit] Member functions

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

std::bad_array_new_length::bad_array_new_length

bad_array_new_length() noexcept;
(1) (since C++11)
bad_array_new_length( const bad_array_new_length& other ) noexcept;
(2) (since C++11)

Constructs a new bad_array_new_length 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_array_new_length then std::strcmp(what(), other.what()) == 0.

Parameters

other - another exception object to copy

std::bad_array_new_length::operator=

bad_array_new_length& operator=( const bad_array_new_length& other ) noexcept;
(since C++11)

Assigns the contents with those of other. If *this and other both have dynamic type std::bad_array_new_length then std::strcmp(what(), other.what()) == 0 after assignment.

Parameters

other - another exception object to assign with

Return value

*this

std::bad_array_new_length::what

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::bad_alloc

Inherited from std::exception

Member functions

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

[edit] Example

Three conditions where std::bad_array_new_length should be thrown:

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

Possible output:

std::bad_array_new_length

[edit] See also

allocation functions
(function) [edit]
exception thrown when memory allocation fails
(class) [edit]