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std::size_t

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Grundtypen
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Basic types
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Grundtypen
Feste Breite Integer-Typen (C++11)
ptrdiff_t
size_t
max_align_t(C++11)
Numerische Grenzen
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Numeric limits
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numeric_limits
C numerische begrenzt Schnittstelle
Laufzeit-Typinformationen
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Runtime type information
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Exterieur
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Type traits
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Primären Typ Kategorien
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Primary type categories
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is_void(C++11)
is_array(C++11)
is_pointer(C++11)
is_enum(C++11)
is_union(C++11)
is_class(C++11)
is_function(C++11)
is_object(C++11)
is_scalar(C++11)
is_compound(C++11)
is_integral(C++11)
is_floating_point(C++11)
is_fundamental(C++11)
is_arithmetic(C++11)
is_reference(C++11)
is_lvalue_reference(C++11)
is_rvalue_reference(C++11)
is_member_pointer(C++11)
is_member_object_pointer(C++11)
is_member_function_pointer(C++11)
Typ Eigenschaften
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Type properties
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is_const(C++11)
is_volatile(C++11)
is_pod(C++11)
is_empty(C++11)
is_polymorphic(C++11)
is_abstract(C++11)
Unterstützte Operationen
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Supported operations
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is_constructible
is_trivially_constructible
is_nothrow_constructible
(C++11)
(C++11)
(C++11)
is_default_constructible
is_trivially_default_constructible
is_nothrow_default_constructible
(C++11)
(C++11)
(C++11)
is_copy_constructible
is_trivially_copy_constructible
is_nothrow_copy_constructible
(C++11)
(C++11)
(C++11)
is_move_constructible
is_trivially_move_constructible
is_nothrow_move_constructible
(C++11)
(C++11)
(C++11)
is_assignable
is_trivially_assignable
is_nothrow_assignable
(C++11)
(C++11)
(C++11)
is_copy_assignable
is_trivially_copy_assignable
is_nothrow_copy_assignable
(C++11)
(C++11)
(C++11)
is_move_assignable
is_trivially_move_assignable
is_nothrow_move_assignable
(C++11)
(C++11)
(C++11)
is_destructible
is_trivially_destructible
is_nothrow_destructible
(C++11)
(C++11)
(C++11)
has_virtual_destructor(C++11)
Beziehungen und Eigentum Abfragen
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Relationships and property queries
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is_same(C++11)
is_base_of(C++11)
is_convertible(C++11)
alignment_of(C++11)
rank(C++11)
extent(C++11)
Typ Modifikationen
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Type modifications
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remove_cv
remove_const
remove_volatile
(C++11)
(C++11)
(C++11)
add_cv
add_const
add_volatile
(C++11)
(C++11)
(C++11)
make_signed(C++11)
make_unsigned(C++11)
Typ Transformationen
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Type transformations
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aligned_storage(C++11)
aligned_union(C++11)
decay(C++11)
enable_if(C++11)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
result_of(C++11)
Typ-Trait-Konstanten
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Type trait constants
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integral_constant(C++11)
 
Defined in header <cstddef>
Defined in header <cstdio>
Defined in header <cstring>
Defined in header <ctime>
typedef /*implementation-defined*/ size_t;
std::size_t ist der vorzeichenlose Integer-Typ des Ergebnisses des sizeof Operators und des alignof Operators.
Original:
std::size_t is the unsigned integer type of the result of the sizeof operator and the alignof operator.
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[Bearbeiten] Notes

size_t kann die maximale Größe jedes theoretisch möglichen Objekts beliebigen Typs (einschließlich Arrays) speichern. Auf vielen Plattformen (eine Ausnahme sind Systeme mit segmentierter Adressierung) kann der Wert eines Non-Member Zeigers sicher in std :: size_t gespeichert werden und ist in diesem ​​Fall gleichbedeutend mit std::uintptr_t.
Original:
size_t can store the maximum size of a theoretically possible object of any type (including array). On many platforms (an exception are systems with segmented addressing) std::size_t can safely store the value of any non-member pointer, in which case it is synonymous with std::uintptr_t.
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std::size_t wird häufig für Array-Indizierung und Loop-Zählung verwendet. Programme, die andere Typen für die Indizierung von Arrays verwenden, wie z.B. unsigned int, können fehlschlagen, wenn z.B. auf 64-Bit-Systemen der Index UINT_MAX übersteigt oder wenn die Programme modulare 32-Bit Arithmetik voraussetzen.
Original:
std::size_t is commonly used for array indexing and loop counting. Programs that use other types, such as unsigned int, for array indexing may fail on, e.g. 64-bit systems when the index exceeds UINT_MAX or if it relies on 32-bit modular arithmetic.
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Für die Indizierung von C++ Containern, wie std::string, std::vector, etc, wird der geeignete Typ als typedef size_type von der Container-Klasse bereitgestellt und wird in der Regel als Synonym für std::size_t definiert.
Original:
When indexing C++ containers, such as std::string, std::vector, etc, the appropriate type is the member typedef size_type provided by such containers. It is usually defined as a synonym for std::size_t.
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[Bearbeiten] Beispiel

#include <cstddef>
int main()
{
    const std::size_t N = 100;
    int* a = new int[N];
    for(std::size_t n = 0; n<N; ++n)
        a[n] = n;
    delete[] a;
}


[Bearbeiten] Siehe auch

vorzeichenbehafteter Ganzzahl-Typ als Ergebnis der Subtraktion zweier Zeiger
Original:
signed integer type returned when subtracting two pointers
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(typedef) [edit]
Abstand zwischen dem Beginn eines Standard-Layout-Typs und der benannten Member-Variable in Byte
Original:
byte offset from the beginning of a standard-layout type to specified member
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(funktionieren Makro) [edit]