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    std::ptrdiff_t

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    Basic types
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    Grundtypen
    Feste Breite Integer-Typen(C++11)
    ptrdiff_t
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    Numeric limits
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    definiert 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(){conststd::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

    vorzeichenloser Ganzzahltyp, der vom Operator sizeof zurückgegeben wird
    Original:
    unsigned integer type returned by the sizeof operator
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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]
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