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std::bad_array_new_length

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std::bad_array_new_length
Les fonctions membres
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bad_array_new_length::bad_array_new_length
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Inherited from std::exception
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exception::~exception
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Defined in header <new>
class bad_array_new_length;
(depuis C++11)

std::bad_array_new_length is the type of the object thrown as exceptions by the nouvelles-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
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Inheritance diagram

Sommaire

[modifier] Fonctions membres

construit l'objet bad_array_new_length
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constructs the bad_array_new_length object
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(fonction membre publique)

Inherited from std::bad_alloc

Inherited from std::exception

Member functions

[
virtuel
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virtual
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]
Détruit l'objet exception
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destructs the exception object
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(function membre virtuelle publique de std::exception) [edit]
[
virtuel
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virtual
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]
retourne une chaîne explicative
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returns an explanatory string
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(function membre virtuelle publique de std::exception) [edit]

[modifier] Notes

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

[modifier] Exemple

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
        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';
    }
}


[modifier] Voir aussi

fonctions d'allocation
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allocation functions
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(fonction) [edit]
Exception levée lorsque l'allocation de mémoire échoue
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exception thrown when memory allocation fails
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(classe) [edit]