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std::underlying_type

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C++
 
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initializer_list(C++11)
bitset
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rel_ops::operator!=
rel_ops::operator>
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rel_ops::operator>=
Pares y tuplas
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Cambiar, hacia adelante y mover
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
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Tipos básicos
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Basic types
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Tipos fundamentales
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Caracteres de tipo
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Categorías primarias de tipo
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is_void(C++11)
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is_const(C++11)
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Operaciones compatibles
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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)
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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)
Modificaciones de tipo
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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)
Transformaciones de tipo
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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)
Escriba constantes rasgos
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Type trait constants
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct underlying_type;
 (ya que C + +11)
Define un type miembro de typedef tipo que es el tipo subyacente de la enumeración T .
Original:
Defines a member typedef type of type that is the underlying type for the enumeration T.
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[editar] Tipos de miembros

Nombre
Original:
Name
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 Definition
type
el tipo subyacente de T
Original:
the underlying type for T
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[editar] Notas

Cada tipo de enumeración tiene un tipo subyacente, que puede ser
Original:
Each enumeration type has an underlying type, which can be
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1. Especificado explícitamente (tanto de ámbito y sin ámbito enumeraciones)
Original:
1. Specified explicitly (both scoped and unscoped enumerations)
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2. Pero, omitida, en cuyo caso es int ámbito de las enumeraciones o un tipo definido por la implantación integral capaz de representar todos los valores de la enumeración de las enumeraciones (sin ámbito)
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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[editar] Ejemplo

#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';
}

Output: 

underlying type for 'e1' is unsigned
underlying type for 'e2' is int
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/types/underlying_type&oldid=21088»