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std::is_scalar

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is_scalar
(C++11)
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Definido no cabeçalho <type_traits>
template< class T >
struct is_scalar;
 (desde C++11)
Se T é um tipo escalar (isto é, tipo de aritmética, tipo de enumeração, ponteiro, ponteiro para membro, ou std::nullptr_t, incluindo as variantes cv-qualificados), fornece o membro constante value true igual. Para qualquer outro tipo, é 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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Índice

Herdado de std::integral_constant

Member constants

value
[estática]
true se T is a scalar type , false contrário
Original:
true if T is a scalar type , false otherwise
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(membro estático público constante)

Member functions

operator bool
converte o objeto em bool, retorna value
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converts the object to bool, returns value
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(função pública membro)

Member types

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

[editar] Notas

Cada localização de memória individual no modelo de memória C + +, incluindo os locais de memória ocultos utilizados por recursos de linguagem (por exemplo, ponteiro da tabela virtual), tem tipo escalar (ou é uma seqüência de adjacentes campos de bit de não-comprimento zero). Sequenciamento de efeitos colaterais na avaliação da expressão, sincronização interthread e dependência ordenação são definidos em termos de objetos escalares individuais.
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] Possível implementação

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] Exemplo

#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';
}

Saída: 

T is scalar
T is not a scalar

[editar] Veja também

(C++11)
verifica se um tipo é o tipo de aritmética
Original:
checks if a type is arithmetic type
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(modelo de classe) [edit]
(C++11)
verifica se o tipo é um tipo de enumeração
Original:
checks if a type is an enumeration type
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(modelo de classe) [edit]
(C++11)
verifica se um tipo é um tipo de ponteiro
Original:
checks if a type is a pointer type
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(modelo de classe) [edit]
(C++11)
 checks if a type is a pointer to a non-static member function or object
(modelo de classe) [edit]
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