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Conceptos C++: RandomAccessIterator

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C++
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Especificaciones técnicas
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C + + conceptos
Básica
Original:
Basic
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Biblioteca-Wide
Original:
Library-Wide
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Container
Original:
Container
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Elementos contenedores
Original:
Container Elements
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Iterator
Original:
Iterator
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RandomAccessIterator
Números aleatorios
Original:
Random Numbers
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Concurrencia
Original:
Concurrency
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(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Otros
Original:
Other
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Un RandomAccessIterator es un BidirectionalIterator que se puede mover para apuntar a cualquier elemento de constante de tiempo .
Original:
A RandomAccessIterator is a BidirectionalIterator that can be moved to point to any element in constant time.
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Un puntero estándar es un ejemplo de un tipo que satisface este concepto .
Original:
A standard pointer is an example of a type that satisfies this concept.
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[editar] Requisitos

Además de los requisitos anteriores, para un tipo It ser un RandomAccessIterator, instancias a, b, i, y r de It debe:
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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Expression Return Equivalent expression Notes
r += n It& if(n>=0)

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

  • n puede ser positivo o negativo
    Original:
    n can be both positive or negative
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  • Complejidad constante (es decir, la expresión equivalente no se puede utilizar como aplicación)
    Original:
    Constant complexity (that is, the equivalent expression cannot be used as implementation)
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i + n It It temp = i;

return temp += n;

n + i It i + n
r -= n It& return r += -n;
i - n It It temp = i;

return temp -= n;

n - i It i - n
b - a difference n returns n such that a+n==b
i[n] convertible to reference *(i + n)
a < b contextually convertible to bool b - a > 0 Strict total ordering relation:
  • !(a < a)
  • si a < b entonces !(b < a)
    Original:
    if a < b then !(b < a)
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  • si a < b y luego b < c a < c
    Original:
    if a < b and b < c then a < c
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  • a < b o b < a o a == b
    (exactamente una de las expresiones es verdadera)
    Original:
    a < b or b < a or a == b
    (exactly one of the expressions is true)
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a > b contextually convertible to bool b < a Total ordering relation opposite to a < b
a >= b contextually convertible to bool !(a < b)
a <= b contextually convertible to bool !(a > b)

[editar] Notas del cuadro

  • It es el tipo de aplicación de este concepto
    Original:
    It is the type implementing this concept
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  • T es la std::iterator_traits<It>::value_type tipo
    Original:
    T is the type std::iterator_traits<It>::value_type
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  • reference es la std::iterator_traits<It>::reference tipo
    Original:
    reference is the type std::iterator_traits<It>::reference
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  • difference es la std::iterator_traits<It>::difference_type tipo
    Original:
    difference is the type std::iterator_traits<It>::difference_type
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  • i, a, b son objetos de tipo It o const It
    Original:
    i, a, b are objects of type It or const It
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  • r es un valor de It& tipo
    Original:
    r is a value of type It&
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  • n es un número entero de difference tipo
    Original:
    n is an integer of type difference
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Las reglas anteriores implican que RandomAccessIterator también implementa LessThanComparable .
Original:
The above rules imply that RandomAccessIterator also implements LessThanComparable.
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Un mutable RandomAccessiterator es un BidirectionalIterator que además cumple con los requisitos OutputIterator .
Original:
A mutable RandomAccessiterator is a BidirectionalIterator that additionally satisfies the OutputIterator requirements.
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