std::remove, std::remove_if

 

C++

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Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Algoritmo libreria

Funzioni Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Non modifica le operazioni di sequenza Original: Non-modifying sequence operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
all_of any_of none_of (C++11) (C++11) (C++11) for_each count count_if mismatch equal	find find_if find_if_not (C++11) find_end find_first_of adjacent_find search search_n
Modifica delle operazioni di sequenza Original: Modifying sequence operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
copy copy_if (C++11) copy_n (C++11) copy_backward move (C++11) move_backward (C++11) fill fill_n transform generate generate_n remove remove_if remove_copy remove_copy_if	replace replace_if replace_copy replace_copy_if swap swap_ranges iter_swap reverse reverse_copy rotate rotate_copy random_shuffle shuffle   (C++11) unique unique_copy
Partizionamento operazioni Original: Partitioning operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is_partitioned (C++11) partition partition_copy (C++11)	stable_partition partition_point (C++11)
Ordinamento delle operazioni (su intervalli ordinati) Original: Sorting operations (on sorted ranges) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is_sorted (C++11) is_sorted_until (C++11) sort	partial_sort partial_sort_copy stable_sort nth_element
Binarie (le operazioni di ricerca sui campi ordinati) Original: Binary search operations (on sorted ranges) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
lower_bound upper_bound	binary_search equal_range
Impostare le operazioni (su intervalli ordinati) Original: Set operations (on sorted ranges) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
merge inplace_merge includes	set_difference set_intersection set_symmetric_difference set_union
Heap operazioni Original: Heap operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is_heap is_heap_until (C++11) make_heap	push_heap pop_heap sort_heap
Minimo / massimo le operazioni Original: Minimum/maximum operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
max max_element min min_element minmax (C++11) minmax_element (C++11)	lexicographical_compare is_permutation (C++11) next_permutation prev_permutation
Operazioni numeriche Original: Numeric operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
iota (C++11) accumulate inner_product	adjacent_difference partial_sum
Libreria C Original: C library The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
qsort	bsearch

 

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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Parametri

first, last	-	l'intervallo di elementi di processo Original: the range of elements to process The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
value	-	il valore di elementi da rimuovere Original: the value of elements to remove The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
p	-	unary predicate which returns ​true se l'elemento deve essere rimosso Original: if the element should be removed The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. . 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.

Valore di ritorno

Iterator alla fine della nuova gamma

Original:

Iterator to the new end of the range

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Complessità

Esattamente std::distance(first, last) applicazioni del predicato.

Original:

Exactly std::distance(first, last) applications of the predicate.

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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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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;}

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

Vedi anche

remove_copy remove_copy_if	copia un intervallo di elementi omettendo quelli che soddisfano criteri specifici Original: copies a range of elements omitting those that satisfy specific criteria The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello)