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std::ptrdiff_t

提供: cppreference.com
< cpp‎ | types

 
 
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Defined in header <cstddef>
typedef /*implementation-defined*/ ptrdiff_t;
std::ptrdiff_t二つのポインタを減算した結果の符号付き整数型です.
Original:
std::ptrdiff_t is the signed integer type of the result of subtracting two pointers.
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[編集] ノート

負の値が可能であればstd::ptrdiff_tは、ポインタ演算と配列のインデックス付けのために使用されます。そのようなintなどの他のタイプを使用するプログラムは、、で失敗する可能性があり、例えば、 64ビットシステムでは、32ビットモジュラー演算に依存している場合、インデックスがINT_MAX超えたり.
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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C + +のコンテナライブラリを操作する場合、反復子の差のために適切な型は、しばしばdifference_typeと同義であるメンバのtypedefstd::ptrdiff_t、です.
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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同じ配列(配列の終わり過去ポインタ1を含む)の要素へのポインタのみが互いに減算することができる.
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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アレイは、2つのポインタ間の差はPTRDIFF_MAXとして表現できない可能性があること、(SIZE_MAX要素よりも大きいが、std::ptrdiff_tバイト未満)ほど大きい場合には、そのような2つのポインタの減算結果は未定義です.
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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PTRDIFF_MAXの署名された相手とstd::ptrdiff_tstd::size_t行為より短いchar型の配列の場合:それは任意の型の配列のサイズを格納していることができ、ほとんどのプラットフォームで、std::intptr_tと同義).
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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[編集]

#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;
 
}


[編集] も参照してください

sizeof子によって戻された符号なし整数型
Original:
unsigned integer type returned by the sizeof operator
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(typedefです) [edit]
バイトは、標準レイアウトの種類の先頭から指定されたメンバへのオ​​フセット
Original:
byte offset from the beginning of a standard-layout type to specified member
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(関数マクロ) [edit]