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    std::underlying_type

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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
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    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
    Original:
    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 <type_traits>
    template< class T > struct underlying_type;
    		 (depuis C++11)
    Dfinit un type membre de typedef type qui est le type sous-jacent de l'numration T .
    Original:
    Defines a member typedef type of type that is the underlying type for the enumeration T.
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    Types de membres

    Nom
    Original:
    Name
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    		 Definition
    type
    le type sous-jacent de T
    Original:
    the underlying type for T
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    Notes

    Chaque type d'numration est un type de sous-jacent, qui peut tre
    Original:
    Each enumeration type has an underlying type, which can be
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    1. Spcifie explicitement ( la fois porte et les numrations sans porte)
    Original:
    1. Specified explicitly (both scoped and unscoped enumerations)
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    2. Omis, auquel cas il est int pour les numrations de porte ou d'un type dfini par la mise en uvre intgrale capable de reprsenter toutes les valeurs de l'numration (pour les numrations sans porte)
    Original:
    2. Omitted, in which case it is int for scoped enumerations or an implementation-defined integral type capable of representing all values of the enum (for unscoped enumerations)
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    Exemple

    #include <iostream>
#include <type_traits>

enum e1 {};
enum class e2: int {};

int main() {
    bool e1_type = std::is_same<
        unsigned
       ,typename std::underlying_type<e1>::type
    >::value; 

    bool e2_type = std::is_same<
        int
       ,typename std::underlying_type<e2>::type
    >::value;
   
    std::cout
    << "underlying type for 'e1' is " << (e1_type?"unsigned":"non-unsigned") << '\n'
    << "underlying type for 'e2' is " << (e2_type?"int":"non-int") << '\n';
}

    Rsultat : 

    underlying type for 'e1' is unsigned
underlying type for 'e2' is int
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