Varianti

    std::is_fundamental

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    <metanoindex/>

     
    C++
     
    Utilità libreria
    Tipo di supporto (basic types, RTTI, type traits)
    Gestione della memoria dinamica
    La gestione degli errori
    Programma di utilità
    Funzioni variadic
    Data e ora
    Funzione oggetti
    initializer_list(C++11)
    bitset
    hash(C++11)
    Gli operatori relazionali
    Original:
    Relational operators
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    rel_ops::operator!=
    rel_ops::operator>
    rel_ops::operator<=
    rel_ops::operator>=
    Coppie e tuple
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    Pairs and tuples
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    pair
    tuple(C++11)
    piecewise_construct_t(C++11)
    piecewise_construct(C++11)
    Swap, in avanti e spostare
    Original:
    Swap, forward and move
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    swap
    forward(C++11)
    move(C++11)
    move_if_noexcept(C++11)
    declval(C++11)
     
    Tipo di supporto
    Tipi base
    Original:
    Basic types
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    Tipi fondamentali
    Larghezza fissa interi tipi (C++11)
    Limiti numerici
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    Numeric limits
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    numeric_limits
    C numerico limita interfaccia
    Informazioni sul tipo di runtime
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    Runtime type information
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    Tipo tratti
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    Type traits
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    Categorie di tipo primario
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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)
    Proprietà del tipo
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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)
    Operazioni supportate
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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)
    I rapporti e le query di proprietà
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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)
    Tipo modifiche
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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)
    Tipo di trasformazioni
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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)
    Digitare costanti tratto
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    Type trait constants
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    integral_constant(C++11)
     
    <tbody> </tbody>
    Elemento definito nell'header <type_traits>
    template< class T > struct is_fundamental;
    		 (dal C++11)
    Se T è un tipo fondamentale (cioè tipo aritmetico, void o nullptr_t), fornisce il membro costante value true uguali. Per qualsiasi altro tipo, è value false.
    Original:
    If T is a fundamental type (that is, arithmetic type, void, or nullptr_t), provides the member constant value equal true. For any other type, value is false.
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    Inherited from std::integral_constant

    Member constants

    value
    [statico]
    true se T is a fundamental type , false altrimenti
    Original:
    true if T is a fundamental type , false otherwise
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    (pubblico membro statico costante)

    Member functions

    operator bool
    converte l'oggetto in bool, restituisce value
    Original:
    converts the object to bool, returns value
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    (metodo pubblico)

    Member types

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

    Possibile implementazione

    template< class T>
struct is_fundamental
  : std::integral_constant<
        bool,
        std::is_arithmetic<T>::value ||
        std::is_void<T>::value  ||
        std::is_same<std::nullptr_t, typename std::remove_cv<T>::type>::value
> {};

    Esempio

    #include <iostream>
#include <type_traits>

class A {};

int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_fundamental<A>::value << '\n';
    std::cout << std::is_fundamental<int>::value << '\n';
    std::cout << std::is_fundamental<int&>::value << '\n';
    std::cout << std::is_fundamental<int*>::value << '\n';
    std::cout << std::is_fundamental<float>::value << '\n';
    std::cout << std::is_fundamental<float&>::value << '\n';
    std::cout << std::is_fundamental<float*>::value << '\n';
}

    Output: 

    false
true
false
false
true
false
false

    Vedi anche

    (C++11)
    controlla se un tipo è di tipo composto
    Original:
    checks if a type is compound type
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    (classe template) [modifica]
    (C++11)
    Verifica se un tipo è di tipo aritmetico
    Original:
    checks if a type is arithmetic type
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    (classe template) [modifica]
    (C++11)
    Verifica se un tipo è void
    Original:
    checks if a type is void
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    (classe template) [modifica]
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