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      C++ コンセプト： RandomAccessIterator

      提供: cppreference.com
      < cpp‎ | concept

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      RandomAccessIteratorは、一定時間内の任意の要素を指すように移動することができBidirectionalIteratorです.
      Original:
      A RandomAccessIterator is a BidirectionalIterator that can be moved to point to any element in constant time.
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      標準のポインタは、このコンセプトを満たす型の例です。.
      Original:
      A standard pointer is an example of a type that satisfies this concept.
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      [編集]要件

      上記の要件に加えて、型ItためRandomAccessIteratorされるためには、インスタンスがa、b、iのr、とItを行う必要があります
      Original:
      In addition to the above requirement, for a type It to be an RandomAccessIterator, instances a, b, i, and r of It must:
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      ExpressionReturnEquivalent expressionNotes
      r += nIt&if(n>=0)

         while(n--)++r;
      else
         while(n++)--r;
      return r;

      • nは、正または負の両方にすることができます
        Original:
        n can be both positive or negative
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      • 一定の複雑さ（すなわち、同等の表現は実装として使用することはできません）
        Original:
        Constant complexity (that is, the equivalent expression cannot be used as implementation)
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      i + nItIt temp = i;

      return temp += n;

      n + iIti + n
      r -= nIt&return r +=-n;
      i - nItIt temp = i;

      return temp -= n;

      n - iIti - n
      b - adifferencenreturns n such that a+n==b
      i[n]convertible to reference*(i + n)
      a < bcontextually convertible to boolb - a >0Strict total ordering relation:
      • !(a < a)
      • もしa < bその後!(b < a)
        Original:
        if a < b then !(b < a)
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      • a < bいただくとb < cその後a < c
        Original:
        if a < b and b < c then a < c
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      • a < bまたはb < aまたはa == b
        （正確に表現のいずれかに該当する）
        Original:
        a < b or b < a or a == b
        (exactly one of the expressions is true)
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      a > bcontextually convertible to boolb < aTotal ordering relation opposite to a < b
      a >= bcontextually convertible to bool!(a < b)
      a <= bcontextually convertible to bool!(a > b)

      [編集]表の注意事項

      • Itこの概念を実装している型です
        Original:
        It is the type implementing this concept
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      • Tタイプstd::iterator_traits<It>::value_typeです
        Original:
        T is the type std::iterator_traits<It>::value_type
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      • referenceタイプstd::iterator_traits<It>::referenceです
        Original:
        reference is the type std::iterator_traits<It>::reference
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      • differenceタイプstd::iterator_traits<It>::difference_typeです
        Original:
        difference is the type std::iterator_traits<It>::difference_type
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      • i、a、b型のオブジェクトでItまたはconst It
        Original:
        i, a, b are objects of type It or const It
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      • rタイプIt&の値です
        Original:
        r is a value of type It&
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      • nタイプdifferenceの整数である
        Original:
        n is an integer of type difference
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      上記の規則はRandomAccessIteratorもLessThanComparableを実装していることを意味するものではあり.
      Original:
      The above rules imply that RandomAccessIterator also implements LessThanComparable.
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      mutable RandomAccessiteratorはさらにBidirectionalIterator要件を満たしOutputIteratorです.
      Original:
      A mutable RandomAccessiterator is a BidirectionalIterator that additionally satisfies the OutputIterator requirements.
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