std::is_compound - cppreference.com

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Definido no cabeçalho `<type_traits>`

`template< class T > struct is_compound;`		(desde C++11)

Se T é um tipo composto (ou seja, matriz, função, objeto ponteiro, ponteiro de função, ponteiro de objeto membro, ponteiro de função membro, classe de referência, união, ou enumeração, incluindo as variantes cv-qualificados), fornece o membro constante value true igual. Para qualquer outro tipo, é value false.

Original:

If T is a compound type (that is, array, function, object pointer, function pointer, member object pointer, member function pointer, reference, class, union, or enumeration, including any cv-qualified variants), provides the member constant value equal true. For any other type, value is false.

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Herdado de std::integral_constant

Member constants


	`true` se `T` is a compound type , `false` contrário Original: `true` if `T` is a compound type , `false` otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (membro estático público constante)

Member functions


	converte o objeto em `bool`, retorna `value` Original: converts the object to `bool`, returns `value` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro)

Member types


Tipo Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition

`value_type`	`bool`

`type`	`std::integral_constant<bool, value>`

Notas

Tipos de compostos são os tipos que são construídos a partir de tipos fundamentais. Qualquer C + + tipo é fundamental ou composto.

Original:

Compound types are the types that are constructed from fundamental types. Any C++ type is either fundamental or compound.

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Possível implementação

template< class T >
struct is_compound : std::integral_constant<bool, !std::is_fundamental<T>::value> {};

Exemplo

#include <iostream>
#include <type_traits>

int main() {
    class cls {};
    std::cout << (std::is_compound<cls>::value
                     ? "T is compound"
                     : "T is not a compound") << '\n';
    std::cout << (std::is_compound<int>::value
                     ? "T is compound"
                     : "T is not a compound") << '\n';
}

Saída:

T is compound
T is not a compound

Veja também


is_fundamental (C++11)	verifica se um tipo é o tipo fundamental Original: checks if a type is fundamental type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) [edit]

is_scalar (C++11)	verifica se um tipo é tipo escalar Original: checks if a type is scalar type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) [edit]

is_object (C++11)	verifica se um tipo é tipo de objeto Original: checks if a type is object type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) [edit]

is_array (C++11)	verifica se o tipo é um tipo de matriz Original: checks if a type is an array type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) [edit]