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std::ptrdiff_t

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C++
 
Bibliothèque d'utilitaires
 
Soutien aux types fondamentaux
Les types de base
Original:
Basic types
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Types fondamentaux
Fixe les types entiers largeur (C++11)
ptrdiff_t
size_t
max_align_t (C++11)
Limites numériques
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Numeric limits
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numeric_limits
C numérique limite interface
Informations sur le type d'exécution
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Runtime type information
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Caractères de type
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Type traits
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Catégories de type primaire
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Primary type categories
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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
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Type properties
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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
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Supported operations
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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
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Relationships and property queries
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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
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Type modifications
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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
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Type transformations
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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
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Type trait constants
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integral_constant (C++11)
 
Défini dans l'entête <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.
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[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.
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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.
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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.
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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.
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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).
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[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
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(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
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(fonction macro) [edit]
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