Namespace
Varianti

std::remove, std::remove_if

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< cpp‎ | algorithm

 
 
Algoritmo libreria
Funzioni
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Functions
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Non modifica le operazioni di sequenza
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Non-modifying sequence operations
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Modifica delle operazioni di sequenza
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Modifying sequence operations
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Partizionamento operazioni
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Partitioning operations
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Ordinamento delle operazioni (su intervalli ordinati)
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Sorting operations (on sorted ranges)
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Binarie (le operazioni di ricerca sui campi ordinati)
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Binary search operations (on sorted ranges)
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Impostare le operazioni (su intervalli ordinati)
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Set operations (on sorted ranges)
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Heap operazioni
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Heap operations
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Minimo / massimo le operazioni
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Minimum/maximum operations
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Operazioni numeriche
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Numeric operations
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Libreria C
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C library
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Defined in header <algorithm>
template< class ForwardIt, class T >
ForwardIt remove( ForwardIt first, ForwardIt last, const T& value );
(1)
template< class ForwardIt, class UnaryPredicate >
ForwardIt remove_if( ForwardIt first, ForwardIt last, UnaryPredicate p );
(2)
Rimuove tutti gli elementi che soddisfano i criteri specifici della [first, last) gamma. La prima versione rimuove tutti gli elementi che sono uguali a value, la seconda versione rimuove tutti gli elementi per i quali predicato p ritorna true.
Original:
Removes all elements satisfying specific criteria from the range [first, last). The first version removes all elements that are equal to value, the second version removes all elements for which predicate p returns true.
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Rimozione avviene spostando gli elementi nell'intervallo in modo tale che gli elementi da cancellare vengono sovrascritti. Gli elementi tra la vecchia e la nuova estremità della gamma hanno valori non specificati. Un iteratore alla fine della nuova gamma è restituito. Ordine relativo degli elementi che rimangono è conservato.
Original:
Removing is done by shifting the elements in the range in such a way that elements to be erased are overwritten. The elements between the old and the new ends of the range have unspecified values. An iterator to the new end of the range is returned. Relative order of the elements that remain is preserved.
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Indice

[modifica] Parametri

first, last -
l'intervallo di elementi di processo
Original:
the range of elements to process
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value -
il valore di elementi da rimuovere
Original:
the value of elements to remove
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p - unary predicate which returns ​true
se l'elemento deve essere rimosso
Original:
if the element should be removed
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.

The signature of the predicate function should be equivalent to the following:

 bool pred(const Type &a);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The type Type must be such that an object of type ForwardIt can be dereferenced and then implicitly converted to Type. ​

Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.
-
The type of dereferenced ForwardIt must meet the requirements of MoveAssignable.

[modifica] Valore di ritorno

Iterator alla fine della nuova gamma
Original:
Iterator to the new end of the range
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[modifica] Complessità

Esattamente std::distance(first, last) applicazioni del predicato.
Original:
Exactly std::distance(first, last) applications of the predicate.
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[modifica] Note

Analogamente il nome funzioni membro contenitore list::remove, list::remove_if, forward_list::remove, e forward_list::remove_if cancellare gli elementi rimossi.
Original:
The similarly-named container member functions list::remove, list::remove_if, forward_list::remove, and forward_list::remove_if erase the removed elements.
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[modifica] Possibile implementazione

First version
template<class ForwardIt, class T>
ForwardIt remove(ForwardIt first, ForwardIt last, 
                       const T& value)
{
    ForwardIt result = first;
    for (; first != last; ++first) {
        if (!(*first == value)) {
            *result++ = *first;
        }
    }
    return result;
}
Second version
template<class ForwardIt, class UnaryPredicate>
ForwardIt remove_if(ForwardIt first, ForwardIt last, 
                          UnaryPredicate p)
{
    ForwardIt result = first;
    for (; first != last; ++first) {
        if (!p(*first)) {
            *result++ = *first;
        }
    }
    return result;
}

[modifica] Esempio

Il codice seguente rimuove tutti gli spazi da una stringa spostandoli alla fine della stringa e poi cancellando .
Original:
The following code removes all spaces from a string by moving them to the end of the string and then erasing.
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#include <algorithm>
#include <string>
#include <iostream>
int main()
{
    std::string str = "Text with some   spaces";
    str.erase(std::remove(str.begin(), str.end(), ' '),
              str.end());
    std::cout << str << '\n';
}

Output:

Textwithsomespaces

[modifica] Vedi anche

copia un intervallo di elementi omettendo quelli che soddisfano criteri specifici
Original:
copies a range of elements omitting those that satisfy specific criteria
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(funzione di modello) [edit]