Espaços nominais
Variantes
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std::remove, std::remove_if

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< cpp‎ | algorithm

 
 
Biblioteca algoritmo
Funções
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Functions
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Não modificar operações de seqüência
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Non-modifying sequence operations
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Modificando operações de seqüência
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Modifying sequence operations
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Particionamento operações
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Partitioning operations
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Operações de classificação (em intervalos ordenados)
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Sorting operations (on sorted ranges)
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Binários operações de busca (em intervalos ordenados)
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Binary search operations (on sorted ranges)
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Definir operações (em intervalos ordenados)
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Set operations (on sorted ranges)
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Operações de pilha
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Heap operations
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Mínimo / máximo de operações
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Minimum/maximum operations
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Operações numéricas
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Numeric operations
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C biblioteca
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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)
Remove todos os elementos que satisfaçam os critérios específicos da [first, last) alcance. A primeira versão remove todos os elementos que são iguais a value, a segunda versão remove todos os elementos para que predicado p retornos 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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A remoção é feito deslocando os elementos no intervalo de tal modo que os elementos a serem apagados são substituídos. Os elementos entre os antigos e os novos objetivos da gama têm valores não especificados. Um iterador para o novo fim do intervalo é devolvido. Ordem relativa dos elementos que permanecem é preservada.
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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Índice

[editar] Parâmetros

first, last -
a gama de elementos ao processo
Original:
the range of elements to process
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value -
o valor de elementos para remover
Original:
the value of elements to remove
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p - unary predicate which returns ​true
se o elemento deve ser removido
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.

[editar] Valor de retorno

Iterator para o novo fim da amplitude
Original:
Iterator to the new end of the range
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[editar] Complexidade

Exatamente std::distance(first, last) aplicações do predicado.
Original:
Exactly std::distance(first, last) applications of the predicate.
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[editar] Notas

As funções de membro com mesmo nome de contêineres list::remove, list::remove_if, forward_list::remove, e forward_list::remove_if apagar os elementos removidos.
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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[editar] Possível implementação

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;
}

[editar] Exemplo

O código a seguir remove todos os espaços de uma string, movendo-os até o fim da seqüência e depois apagar .
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

[editar] Veja também

Copia um intervalo de elementos omitindo aqueles que satisfazem critérios específicos
Original:
copies a range of elements omitting those that satisfy specific criteria
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(modelo de função) [edit]