alignof operator (ya que C + +11)
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Consultas alineación requisitos de un tipo
Original:
Queries alignment requirements of a type
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Contenido |
[editar] Sintaxis
alignof( type )
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Devuelve un objeto de tipo std::size_t .
Original:
Returns an object of type std::size_t.
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[editar] Explicación
Regreso alineación en bytes (una potencia entera de dos) requerido para cualquier instancia de la
type dado, que es ya sea de tipo completo, un tipo de matriz, o un tipo de referencia .Original:
Returns alignment in bytes (an integer power of two) required for any instance of the given
type, which is either complete type, an array type, or a reference type.The text has been machine-translated via Google Translate.
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Si el tipo es el tipo de referencia, el operador devuelve la alineación de referencia tipo, si el tipo es tipo de matriz, requisito de alineación del tipo de elemento se devuelve .
Original:
If the type is reference type, the operator returns the alignment of referenced type; if the type is array type, alignment requirement of the element type is returned.
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Los tipos char, signed char y unsigned char tener el más débil (el más pequeño) la alineación con el apoyo de la aplicación .
Original:
The types char, signed char, and unsigned char have the weakest (smallest) alignment supported by the implementation.
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[editar] Palabras clave
[editar] Ejemplo
#include <iostream> struct Empty {}; struct Foo { int f2; float f1; char c; }; int main() { std::cout << "alignment of empty class: " << alignof(Empty) << '\n' << "alignment of pointer : " << alignof(int*) << '\n' << "alignment of char : " << alignof(char) << '\n' << "alignment of Foo : " << alignof(Foo) << '\n' ; }
Output:
alignment of empty class: 1 alignment of pointer : 8 alignment of char : 1 alignment of Foo : 4
[editar] Ver también
| alignas especificador | especifica que el almacenamiento para la variable debe estar alineado por (C++11) cantidad específica
Original: specifies that the storage for the variable should be aligned by specific amount (C++11) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| (C++11) |
obtiene requisitos del tipo de alineación Original: obtains the type's alignment requirements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (clase de plantilla) |
