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std::is_scalar

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C++
 
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initializer_list(C++11)
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tuple(C++11)
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is_constructible
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is_assignable
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is_copy_assignable
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(C++11)
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is_move_assignable
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(C++11)
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is_destructible
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_scalar;
 (ya que C + +11)
Si T es un tipo escalar (es decir, tipo aritmético, el tipo de enumeración, puntero, puntero a miembro, o std::nullptr_t, incluidas las variantes cv-calificados), establece en el miembro constante value true iguales. Para cualquier otro tipo, es value false .
Original:
If T is a scalar type (that is, arithmetic type, enumeration type, pointer, pointer to member, or std::nullptr_t, including any cv-qualified variants), provides the member constant value equal true. For any other type, value is false.
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Contenido

Inherited from std::integral_constant

Member constants

value
[estático]
true si T is a scalar type , false lo contrario
Original:
true if T is a scalar type , false otherwise
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(público miembro constante estática)

Member functions

operator bool
convierte el objeto a bool, devuelve value
Original:
converts the object to bool, returns value
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(miembro público función)

Member types

Tipo
Original:
Type
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 Definition
value_type bool
type std::integral_constant<bool, value>

[editar] Notas

Cada ubicación de la memoria individual en el modelo de C + + de memoria, incluyendo las posiciones de memoria ocultos utilizados por las características del lenguaje (por ejemplo puntero de tabla virtual), es de tipo escalar (o es una secuencia de bits contiguos campos de longitud diferente de cero). La secuenciación de los efectos secundarios en la evaluación de la expresión, la sincronización interthread, y la dependencia de pedido son definidos en términos de objetos escalares individuales .
Original:
Each individual memory location in the C++ memory model, including the hidden memory locations used by language features (e.g virtual table pointer), has scalar type (or is a sequence of adjacent bit-fields of non-zero length). Sequencing of side-effects in expression evaluation, interthread synchronization, and dependency ordering are all defined in terms of individual scalar objects.
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[editar] Posible implementación

template< class T >
struct is_scalar : std::integral_constant<bool,
                     std::is_arithmetic<T>::value     ||
                     std::is_enum<T>::value           ||
                     std::is_pointer<T>::value        ||
                     std::is_member_pointer<T>::value ||
                     std::is_same<std::nullptr_t, typename std::remove_cv<T>::type>::value> {};

[editar] Ejemplo

#include <iostream>
#include <type_traits>
 
int main() {
    class cls {};
    std::cout << (std::is_scalar<int>::value
                     ? "T is scalar"
                     : "T is not a scalar") << '\n';
    std::cout << (std::is_scalar<cls>::value
                     ? "T is scalar"
                     : "T is not a scalar") << '\n';
}

Output: 

T is scalar
T is not a scalar

[editar] Ver también

(C++11)
Comprueba si un tipo es de tipo aritmético
Original:
checks if a type is arithmetic type
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(clase de plantilla) [edit]
(C++11)
Comprueba si un tipo es un tipo de enumeración
Original:
checks if a type is an enumeration type
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(clase de plantilla) [edit]
(C++11)
Comprueba si un tipo es un tipo de puntero
Original:
checks if a type is a pointer type
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(clase de plantilla) [edit]
(C++11)
 checks if a type is a pointer to a non-static member function or object
(clase de plantilla) [edit]
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/types/is_scalar&oldid=21758»