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<div class="t-tr-text">C + +: concetti<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

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C++
 
C + + concetti
Di base
Original:
Basic
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Biblioteca-Wide
Original:
Library-Wide
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Container
Original:
Container
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Elementi contenitori
Original:
Container Elements
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Iterator
Original:
Iterator
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ForwardIterator
BidirectionalIterator
RandomAccessIterator
Numeri casuali
Original:
Random Numbers
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Concorrenza
Original:
Concurrency
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BasicLockable(C++11)
Lockable(C++11)
TimedLockable(C++11)
Mutex(C++11)
TimedMutex(C++11)
Altro
Original:
Other
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Un RandomAccessIterator è un BidirectionalIterator che può essere spostato per puntare a qualsiasi elemento in tempo costante.
Original:
A RandomAccessIterator is a BidirectionalIterator that can be moved to point to any element in constant time.
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Un puntatore standard è un esempio di un tipo che soddisfa questo concetto.
Original:
A standard pointer is an example of a type that satisfies this concept.
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[modifica] Requisiti

Oltre al requisito di cui sopra, per un tipo It essere un RandomAccessIterator, istanze a, b, i e r di 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 può essere sia positivo che negativo
    Original:
    n can be both positive or negative
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  • Complessità costante (cioè, l'espressione equivalente non può essere utilizzato come implementazione)
    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 poi a < b !(b < a)
    Original:
    if a < b then !(b < a)
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  • se a < b e b < c poi a < c
    Original:
    if a < b and b < c then a < c
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  • a < b o b < a o a == b
    (esattamente una delle espressioni è vera)
    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)

[modifica] Tabella Note

  • It è il tipo di implementazione di questo concetto
    Original:
    It is the type implementing this concept
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  • T è il std::iterator_traits<It>::value_type tipo
    Original:
    T is the type std::iterator_traits<It>::value_type
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  • reference è il std::iterator_traits<It>::reference tipo
    Original:
    reference is the type std::iterator_traits<It>::reference
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  • difference è il 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 sono oggetti di tipo It o const It
    Original:
    i, a, b are objects of type It or const It
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  • r è un valore di tipo It&
    Original:
    r is a value of type It&
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  • n è un numero intero di difference tipo
    Original:
    n is an integer of type difference
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Le norme di cui sopra implicano che RandomAccessIterator implementa anche LessThanComparable.
Original:
The above rules imply that RandomAccessIterator also implements LessThanComparable.
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Un mutable RandomAccessiterator è un BidirectionalIterator che soddisfa inoltre i requisiti OutputIterator.
Original:
A mutable RandomAccessiterator is a BidirectionalIterator that additionally satisfies the OutputIterator requirements.
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Estratto da "http://it.cppreference.com/mwiki/index.php?title=cpp/concept/RandomAccessIterator&oldid=17110"