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std::bad_array_new_length

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std::bad_array_new_length
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bad_array_new_length::bad_array_new_length
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Inherited from std::exception
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Defined in header <new>
class bad_array_new_length;
(dal C++11)

std::bad_array_new_length is the type of the object thrown as exceptions by the nuove-espressioni 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
Informazioni sull'immagine

Inheritance diagram

Indice

[modifica] Membri funzioni

costruisce l'oggetto bad_array_new_length
Original:
constructs the bad_array_new_length object
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(membro pubblico funzione)

Inherited from std::bad_alloc

Inherited from std::exception

Member functions

[virtuale]
distrugge l'oggetto eccezione
Original:
destructs the exception object
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(pubblico virtuale membro of std::exception funzione) [edit]
[virtuale]
restituisce una stringa esplicativa
Original:
returns an explanatory string
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(pubblico virtuale membro of std::exception funzione) [edit]

[modifica] Note

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

[modifica] Esempio

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';
    }
}


[modifica] Vedi anche

allocazione funzioni
Original:
allocation functions
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(funzione) [edit]
Eccezione generata quando allocazione memoria fallisce
Original:
exception thrown when memory allocation fails
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(classe) [edit]