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std::size_t

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< cpp‎ | types

 
 
 
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
Original:
Numeric limits
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numeric_limits
C numérique limite interface
Informations sur le type d'exécution
Original:
Runtime type information
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Caractères de type
Original:
Type traits
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Catégories de type primaire
Original:
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
Original:
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
Original:
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
Original:
Type trait constants
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integral_constant (C++11)
 
Defined in header <cstddef>
Defined in header <cstdio>
Defined in header <cstring>
Defined in header <ctime>
typedef /*implementation-defined*/ size_t;
std::size_t est du type entier non signé du résultat de l'opérateur et l'opérateur sizeof alignof .
Original:
std::size_t is the unsigned integer type of the result of the sizeof operator and the alignof operator.
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[modifier] Notes

size_t peut stocker la taille maximale d'un objet théoriquement possible de tout type (y compris tableau). Sur de nombreuses plateformes (à l'exception des systèmes avec segmenté adressage) std :: size_t pouvez stocker en toute sécurité la valeur d'un pointeur non-membre, auquel cas il est synonyme de std::uintptr_t .
Original:
size_t can store the maximum size of a theoretically possible object of any type (including array). On many platforms (an exception are systems with segmented addressing) std::size_t can safely store the value of any non-member pointer, in which case it is synonymous with std::uintptr_t.
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std::size_t est couramment utilisé pour l'indexation et la matrice de comptage de boucle. Les programmes qui utilisent d'autres types, tels que unsigned int, pour l'indexation de tableau peut échouer sur, par exemple, Systèmes 64-bit lorsque l'indice dépasse UINT_MAX ou si elle s'appuie sur 32-bit arithmétique modulaire .
Original:
std::size_t is commonly used for array indexing and loop counting. Programs that use other types, such as unsigned int, for array indexing may fail on, e.g. 64-bit systems when the index exceeds UINT_MAX or if it relies on 32-bit modular arithmetic.
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Lors de l'indexation C + +, tels que des récipients std::string, std::vector, etc, du type approprié est l'élément size_type typedef fourni par de tels conteneurs. Il est généralement définie comme un synonyme de std::size_t .
Original:
When indexing C++ containers, such as std::string, std::vector, etc, the appropriate type is the member typedef size_type provided by such containers. It is usually defined as a synonym for std::size_t.
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[modifier] Exemple

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


[modifier] Voir aussi

type entier signé retourné lorsque la soustraction de deux pointeurs
Original:
signed integer type returned when subtracting two pointers
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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]