sizeof operator
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Búsquedas tamaño del objeto o del tipo
Original:
Queries size of the object or type
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Se utiliza cuando el tamaño real del objeto debe ser conocido
Original:
Used when actual size of the object must be known
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Contenido |
[editar] Sintaxis
sizeof( type )
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sizeof expression None
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Ambas versiones devolver una constante de tipo std::size_t .
Original:
Both versions return a constant of type std::size_t.
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[editar] Explicación
1)vuelve tamaño en bytes de la representación de objetos de type .
2) Original:
returns size in bytes of the object representation of type.
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tamaño retornos en bytes de la representación de objetos del tipo, que sería devuelto por expression, si se evalúa .
Original:
returns size in bytes of the object representation of the type, that would be returned by expression, if evaluated.
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[editar] Notas
sizeof(char), sizeof(signed char), y sizeof(unsigned char) siempre volver 1, independientemente del valor de CHAR_BIT .
Original:
sizeof(char), sizeof(signed char), and sizeof(unsigned char) always return 1, regardless of the value of CHAR_BIT.
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sizeof no se puede usar con los tipos de función, tipos incompletas, o lvalues de un bit .
Original:
sizeof cannot be used with function types, incomplete types, or bit-field lvalues.
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Cuando se aplica a un tipo de referencia, el resultado es el tamaño del tipo de referencia .
Original:
When applied to a reference type, the result is the size of the referenced type.
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Cuando se aplica a un tipo de clase, el resultado es el tamaño de un objeto de esa clase más cualquier relleno adicional requerido para colocar dicho objeto en una matriz .
Original:
When applied to a class type, the result is the size of an object of that class plus any additional padding required to place such object in an array.
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Cuando se aplica a un tipo de clase vacía, siempre devuelve 1 .
Original:
When applied to an empty class type, always returns 1.
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[editar] Palabras clave
[editar] Ejemplo
La salida de ejemplo corresponde a un sistema con 64-bits y punteros de 32-bit int .
Original:
The example output corresponds to a system with 64-bit pointers and 32-bit int.
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#include <iostream> struct Empty {}; struct Bit {unsigned bit:1; }; int main() { Empty e; Bit b; std::cout << "size of empty class: " << sizeof e << '\n' << "size of pointer : " << sizeof &e << '\n' // << "size of function: " << sizeof(void()) << '\n' // compile error // << "size of incomplete type: " << sizeof(int[]) << '\n' // compile error // << "size of bit field: " << sizeof b.bit << '\n' // compile error << "size of array of 10 int: " << sizeof(int[10]) << '\n'; }
Output:
size of empty class: 1 size of pointer : 8 size of array of 10 int: 40
