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    <metanoindex/>

     
    C++
     
    Bibliothque 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)
    Limites numriques
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    Numeric limits
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    numeric_limits
    C numrique limite interface
    Informations sur le type d'excution
    Original:
    Runtime type information
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    Caractres de type
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    Type traits
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    Catgories 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 proprits 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)
    Oprations 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 requtes de proprit
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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)
     
    <tbody> </tbody>
    Dclar dans l'en-tte <cstddef>
    #define offsetof(type, member) /*implementation-defined*/
    offsetof la macro s'tend une constante de std::size_t type, la valeur de ce qui est le dcalage en octets du dbut d'un objet du type spcifi son lment de donne, y compris le cas chant rembourrage .
    Original:
    The macro offsetof expands to a constant of type std::size_t, the value of which is the offset, in bytes, from the beginning of an object of specified type to its specified member, including padding if any.
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    Notes

    Si type n'est pas un type standard mise en page, le comportement est indfini .
    Original:
    If type is not a standard-layout type, the behavior is undefined.
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    Si member est un membre statique ou un membre de la fonction, le comportement est indfini .
    Original:
    If member is a static member or a function member, the behavior is undefined.
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    Le dcalage du premier membre d'un type standard-layout est toujours zro (vide de base de l'optimisation est obligatoire)
    Original:
    The offset of the first member of a standard-layout type is always zero (vide de base de l'optimisation is mandatory)
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    Mise en uvre possible

    #define offsetof(type,member) ((std::size_t) &(((type*)0)->member))

    Exemple

    #include <iostream>
#include <cstddef>
struct S {
    char c;
    double d;
};
int main()
{
    std::cout << "the first element is at offset " << offsetof(S, c) << '\n'
              << "the double is at offset " << offsetof(S, d) << '\n';
}

    Rsultat : 

    the first element is at offset 0
the double is at offset 8

    Voir aussi
    unsigned integer retourne par l'oprateur sizeof
    Original:
    unsigned integer type returned by the sizeof operator
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    (typedef) [edit]
    (C++11)
    vrifie si un type est standard disposition type
    Original:
    checks if a type is standard-layout type
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    (classe gnrique) [edit]
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