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std::ptrdiff_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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Type traits
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is_void(C++11)
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is_const(C++11)
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is_same(C++11)
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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>
typedef /*implementation-defined*/ ptrdiff_t;
std::ptrdiff_t ist die Ganzzahl Typ des Ergebnisses der Subtraktion zweier Zeiger .
Original:
std::ptrdiff_t is the signed integer type of the result of subtracting two pointers.
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[Bearbeiten] Notes

std::ptrdiff_t für Zeigerarithmetik und Indizierung von Arrays verwendet werden, wenn negative Werte möglich sind. Programme, die andere Typen wie int verwenden, kann fehlschlagen bei, zB 64-Bit-Systemen, wenn der Index INT_MAX übersteigt oder wenn es auf 32-Bit modulare Arithmetik setzt .
Original:
std::ptrdiff_t is used for pointer arithmetic and array indexing, if negative values are possible. Programs that use other types, such as int, may fail on, e.g. 64-bit systems when the index exceeds INT_MAX or if it relies on 32-bit modular arithmetic.
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Beim Arbeiten mit der C + +-Bibliothek Behälters, der richtige Typ für die Differenz zwischen Iteratoren ist das Element typedef difference_type, was häufig gleichbedeutend mit std::ptrdiff_t .
Original:
When working with the C++ container library, the proper type for the difference between iterators is the member typedef difference_type, which is often synonymous with std::ptrdiff_t.
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Nur Zeiger auf Elemente des gleichen Array (einschließlich der Zeiger ein über das Ende des Arrays) können voneinander subtrahiert werden .
Original:
Only pointers to elements of the same array (including the pointer one past the end of the array) may be subtracted from each other.
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Wenn eine Anordnung so groß ist (größer als PTRDIFF_MAX Elemente, aber weniger als SIZE_MAX Bytes), dass die Differenz zwischen zwei Zeiger eventuell nicht darstellbar als std::ptrdiff_t, ist das Ergebnis der Subtraktion zweier solcher Zeiger spezifiziert .
Original:
If an array is so large (greater than PTRDIFF_MAX elements, but less than SIZE_MAX bytes), that the difference between two pointers may not be representable as std::ptrdiff_t, the result of subtracting two such pointers is undefined.
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Bei char Arrays kürzer als PTRDIFF_MAX, std::ptrdiff_t fungiert als signierte Gegenstück std::size_t: sie speichern kann die Größe des Arrays jeder Art und ist auf den meisten Plattformen, gleichbedeutend mit std::intptr_t) .
Original:
For char arrays shorter than PTRDIFF_MAX, std::ptrdiff_t acts as the signed counterpart of std::size_t: it can store the size of the array of any type and is, on most platforms, synonymous with std::intptr_t).
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[Bearbeiten] Beispiel

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


[Bearbeiten] Siehe auch

unsigned Integer-Typ durch die sizeof Operator zurückgegeben
Original:
unsigned integer type returned by the sizeof operator
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(typedef) [edit]
Byte von dem Beginn eines Standard-Layout-Typ spezifiziert versetzt ist
Original:
byte offset from the beginning of a standard-layout type to specified member
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(funktionieren Makro) [edit]