sizeof operator
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La taille des requêtes de l'objet ou de type
Original:
Queries size of the object or type
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Utilisé lorsque la taille réelle de l'objet doit être connue
Original:
Used when actual size of the object must be known
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Sommaire |
[modifier] Syntaxe
sizeof( type )
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sizeof expression None
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Les deux versions renvoient une constante de std::size_t type .
Original:
Both versions return a constant of type std::size_t.
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[modifier] Explication
1)taille en octets rendement de la représentation de l'objet de type .
2) Original:
returns size in bytes of the object representation of type.
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taille en octets rendement de la représentation de l'objet du type, qui doit être retourné par expression, en cas d'évaluation .
Original:
returns size in bytes of the object representation of the type, that would be returned by expression, if evaluated.
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[modifier] Notes
sizeof(char), sizeof(signed char), et sizeof(unsigned char) toujours revenir 1, quelle que soit la valeur 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 ne peut pas être utilisée avec les types de fonctions, des types incomplets ou peu-terrain lvalues .
Original:
sizeof cannot be used with function types, incomplete types, or bit-field lvalues.
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Lorsqu'il est appliqué à un type référence, le résultat est la taille du type référencé .
Original:
When applied to a reference type, the result is the size of the referenced type.
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Lorsqu'il est appliqué à un type de classe, le résultat est la taille d'un objet de cette classe ainsi que tout rembourrage supplémentaire nécessaire pour placer un tel objet dans un tableau .
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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Lorsqu'il est appliqué à un type de classe vide, renvoie toujours 1 .
Original:
When applied to an empty class type, always returns 1.
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[modifier] Mots-clés
[modifier] Exemple
L'exemple de sortie correspond à un système avec des pointeurs 64 bits et 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'; }
Résultat :
size of empty class: 1 size of pointer : 8 size of array of 10 int: 40
