Espaços nominais
Variantes
Acções

<div class="t-tr-text">C + +: conceitos<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">C++ concepts:</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div> RandomAccessIterator

Da cppreference.com
< cpp‎ | concept

 
 
C + + conceitos
Basic
Original:
Basic
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Biblioteca-Wide
Original:
Library-Wide
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Container
Original:
Container
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Elementos de contêineres
Original:
Container Elements
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Iterator
Original:
Iterator
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ForwardIterator
BidirectionalIterator
RandomAccessIterator
Números aleatórios
Original:
Random Numbers
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Simultaneidade
Original:
Concurrency
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BasicLockable(C++11)
Lockable(C++11)
TimedLockable(C++11)
Mutex(C++11)
TimedMutex(C++11)
Outro
Original:
Other
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A RandomAccessIterator é um BidirectionalIterator que pode ser movido para apontar para qualquer elemento em tempo constante.
Original:
A RandomAccessIterator is a BidirectionalIterator that can be moved to point to any element in constant time.
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Um ponteiro de tipo é um exemplo de um tipo que satisfaça este conceito.
Original:
A standard pointer is an example of a type that satisfies this concept.
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[editar] Requisitos

Além do requisito acima, para um tipo It ser um RandomAccessIterator, instâncias a, b, i, r e de It deve:
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 tanto pode ser positivo ou negativo
    Original:
    n can be both positive or negative
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  • Complexidade constante (isto é, a expressão equivalente, não pode ser usado como a aplicação)
    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)
  • se a < b então !(b < a)
    Original:
    if a < b then !(b < a)
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  • se a < b e b < c então a < c
    Original:
    if a < b and b < c then a < c
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  • a < b ou b < a ou a == b
    (exatamente uma das expressões é verdadeira)
    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 de mesa

  • It é o tipo de aplicação deste conceito
    Original:
    It is the type implementing this concept
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  • T é o std::iterator_traits<It>::value_type tipo
    Original:
    T is the type std::iterator_traits<It>::value_type
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  • reference é o std::iterator_traits<It>::reference tipo
    Original:
    reference is the type std::iterator_traits<It>::reference
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  • difference é o 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 são objetos do tipo It ou const It
    Original:
    i, a, b are objects of type It or const It
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  • r é um valor de It& tipo
    Original:
    r is a value of type It&
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  • n é um número inteiro de difference tipo
    Original:
    n is an integer of type difference
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As regras acima implica que RandomAccessIterator também implementa LessThanComparable.
Original:
The above rules imply that RandomAccessIterator also implements LessThanComparable.
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A mutable RandomAccessiterator é um BidirectionalIterator que, adicionalmente, satisfaz os requisitos OutputIterator.
Original:
A mutable RandomAccessiterator is a BidirectionalIterator that additionally satisfies the OutputIterator requirements.
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