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std::is_literal_type

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< cpp‎ | types

 
 
Utilidades de la biblioteca
Escriba apoyo (basic types, RTTI, type traits)
Gestión de memoria dinámica
Gestión de errores
Programa de servicios públicos
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Fecha y hora
Objetos Function
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Operadores relacionales
Original:
Relational operators
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Pares y tuplas
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Pairs and tuples
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Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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Escriba apoyo
Tipos básicos
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Basic types
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Tipos fundamentales
Tipos fijos ancho enteros (C++11)
Límites numéricos
Original:
Numeric limits
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C numérico limita interfaz
Información de tipo en tiempo de ejecución
Original:
Runtime type information
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Caracteres de tipo
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Type traits
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Categorías primarias de tipo
Original:
Primary type categories
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Propiedades de tipo
Original:
Type properties
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(C++11)
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(C++11)
is_literal_type
(C++11)
(C++11)
Operaciones compatibles
Original:
Supported operations
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Relaciones y consultas de propiedad
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Relationships and property queries
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Modificaciones de tipo
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Type modifications
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Transformaciones de tipo
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Type transformations
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Escriba constantes rasgos
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Type trait constants
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Definido en la cabecera <type_traits>
template< class T >
struct is_literal_type;
(desde C++11)
Si T es un tipo literal, establece en el miembro constante value true iguales. Para cualquier otro tipo, es value false .
Original:
If T is a literal type, provides the member constant value equal true. For any other type, value is false.
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Un tipo literal es cualquier tipo escalar, cualquier tipo de referencia o un tipo de clase que:
Original:
A literal type is any scalar type, any reference type or a class type that:
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1. tiene un destructor trivial
Original:
1. has a trivial destructor
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2. todas sus llamadas a constructores e inicializadores de miembros de datos no estáticos son expresiones constantes
Original:
2. all of its constructor calls and initializers for nonstatic data members are constant expressions
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3. es un tipo agregado o tiene al menos un constructor constexpr que no es una copia o constructor movimiento
Original:
3. is an aggregate type or has at least one constexpr constructor that is not a copy or move constructor
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4. todos sus miembros de datos estáticos y clases base son los tipos de literales
Original:
4. all of its nonstatic data members and base classes are literal types
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Una matriz de tipos de literales es también un tipo literal .
Original:
An array of literal types is also a literal type.
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Contenido

Inherited from std::integral_constant

Member constants

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

Member functions

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

Member types

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

[editar] Notas

Sólo los tipos de literales se puede utilizar como parámetros a funciones o regresar de constexpr. Sólo las clases literales pueden tener funciones miembro constexpr .
Original:
Only literal types may be used as parameters to or returned from constexpr functions. Only literal classes may have constexpr member functions.
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[editar] Ejemplo

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    virtual ~B();
};
 
int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_literal_type<A>::value << '\n';
    std::cout << std::is_literal_type<B>::value << '\n';
}

Salida:

true
false