Espaces de noms
Variantes
Affichages
Actions

std::ptrdiff_t

De cppreference.com
< cpp‎ | types

 
 
 
Soutien aux types fondamentaux
Les types de base
Original:
Basic types
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Types fondamentaux
Fixe les types entiers largeur (C++11)
ptrdiff_t
size_t
max_align_t (C++11)
Limites numériques
Original:
Numeric limits
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
numeric_limits
C numérique limite interface
Informations sur le type d'exécution
Original:
Runtime type information
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Caractères de type
Original:
Type traits
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Catégories de type primaire
Original:
Primary type categories
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
is_void (C++11)
is_array (C++11)
is_pointer (C++11)
is_enum (C++11)
is_union (C++11)
is_class (C++11)
is_function (C++11)
is_object (C++11)
is_scalar (C++11)
is_compound (C++11)
is_integral (C++11)
is_floating_point (C++11)
is_fundamental (C++11)
is_arithmetic (C++11)
is_reference (C++11)
is_lvalue_reference (C++11)
is_rvalue_reference (C++11)
is_member_pointer (C++11)
is_member_object_pointer (C++11)
is_member_function_pointer (C++11)
Les propriétés du type
Original:
Type properties
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
is_const (C++11)
is_volatile (C++11)
is_pod (C++11)
is_empty (C++11)
is_polymorphic (C++11)
is_abstract (C++11)
Opérations prises en charge
Original:
Supported operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
is_constructible
is_trivially_constructible
is_nothrow_constructible
(C++11)
(C++11)
(C++11)
is_default_constructible
is_trivially_default_constructible
is_nothrow_default_constructible
(C++11)
(C++11)
(C++11)
is_copy_constructible
is_trivially_copy_constructible
is_nothrow_copy_constructible
(C++11)
(C++11)
(C++11)
is_move_constructible
is_trivially_move_constructible
is_nothrow_move_constructible
(C++11)
(C++11)
(C++11)
is_assignable
is_trivially_assignable
is_nothrow_assignable
(C++11)
(C++11)
(C++11)
is_copy_assignable
is_trivially_copy_assignable
is_nothrow_copy_assignable
(C++11)
(C++11)
(C++11)
is_move_assignable
is_trivially_move_assignable
is_nothrow_move_assignable
(C++11)
(C++11)
(C++11)
is_destructible
is_trivially_destructible
is_nothrow_destructible
(C++11)
(C++11)
(C++11)
has_virtual_destructor (C++11)
Les relations et les requêtes de propriété
Original:
Relationships and property queries
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
is_same (C++11)
is_base_of (C++11)
is_convertible (C++11)
alignment_of (C++11)
rank (C++11)
extent (C++11)
Modifications de type
Original:
Type modifications
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
remove_cv
remove_const
remove_volatile
(C++11)
(C++11)
(C++11)
add_cv
add_const
add_volatile
(C++11)
(C++11)
(C++11)
make_signed (C++11)
make_unsigned (C++11)
Transformations de type
Original:
Type transformations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
aligned_storage (C++11)
aligned_union (C++11)
decay (C++11)
enable_if (C++11)
conditional (C++11)
common_type (C++11)
underlying_type (C++11)
result_of (C++11)
Tapez constantes traits
Original:
Type trait constants
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
integral_constant (C++11)
 
Defined in header <cstddef>
typedef /*implementation-defined*/ ptrdiff_t;
std::ptrdiff_t est du type entier signé du résultat de la soustraction de deux pointeurs .
Original:
std::ptrdiff_t is the signed integer type of the result of subtracting two pointers.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifier] Notes

std::ptrdiff_t est utilisé pour l'arithmétique des pointeurs et l'indexation de tableau, si les valeurs négatives sont possibles. Les programmes qui utilisent d'autres types, tels que int, peut échouer sur, par exemple, Systèmes 64-bit lorsque l'indice dépasse INT_MAX ou si elle s'appuie sur 32-bit arithmétique modulaire .
Original:
std::ptrdiff_t is used for pointer arithmetic and array indexing, if negative values are possible. Programs that use other types, such as int, may fail on, e.g. 64-bit systems when the index exceeds INT_MAX or if it relies on 32-bit modular arithmetic.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Lorsque vous travaillez avec le C + + contenant la bibliothèque, du type approprié pour la différence entre les itérateurs est le difference_type membre typedef, qui est souvent synonyme de std::ptrdiff_t .
Original:
When working with the C++ container library, the proper type for the difference between iterators is the member typedef difference_type, which is often synonymous with std::ptrdiff_t.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Seuls des pointeurs vers les éléments de la matrice de même (y compris le pointeur une delà de l'extrémité de la matrice) peut être déduite à partir de l'autre .
Original:
Only pointers to elements of the same array (including the pointer one past the end of the array) may be subtracted from each other.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Si un réseau est si importante (supérieure à PTRDIFF_MAX éléments, mais inférieure à SIZE_MAX octets), la différence entre les deux pointeurs ne soit pas représentable comme std::ptrdiff_t, le résultat de la soustraction de ces deux pointeurs est défini .
Original:
If an array is so large (greater than PTRDIFF_MAX elements, but less than SIZE_MAX bytes), that the difference between two pointers may not be representable as std::ptrdiff_t, the result of subtracting two such pointers is undefined.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Pour les tableaux ombles de moins de PTRDIFF_MAX, std::ptrdiff_t agit en tant que copie signée de std::size_t: il peut stocker la taille du tableau de n'importe quel type, et est, sur la plupart des plates-formes, synonyme de std::intptr_t) .
Original:
For char arrays shorter than PTRDIFF_MAX, std::ptrdiff_t acts as the signed counterpart of std::size_t: it can store the size of the array of any type and is, on most platforms, synonymous with std::intptr_t).
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifier] Exemple

#include <cstddef>
int main()
{
    const std::size_t N = 100;
    int* a = new int[N];
    int* end = a + N;
    for(std::ptrdiff_t i = N; i>0; --i)
        *(end - i) = i;
    delete[] a;
 
}


[modifier] Voir aussi

unsigned integer retournée par l'opérateur sizeof
Original:
unsigned integer type returned by the sizeof operator
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(typedef) [edit]
décalage d'octet à partir du début d'un type standard à disposition élément spécifié
Original:
byte offset from the beginning of a standard-layout type to specified member
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction macro) [edit]