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std::find_first_of

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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 ForwardIt1, class ForwardIt2 >

ForwardIt1 find_first_of( ForwardIt1 first, ForwardIt1 last,
                          ForwardIt2 s_first, ForwardIt2 s_last );
template< class InputIt, class ForwardIt >
InputIt find_first_of( InputIt first, InputIt last,

                       ForwardIt s_first, ForwardIt s_last );
(1) (até C + 11)


(a partir do C++ 11)
template< class ForwardIt1, class ForwardIt2, class BinaryPredicate >

ForwardIt1 find_first_of( ForwardIt1 first, ForwardIt1 last,
                          ForwardIt2 s_first, ForwardIt2 s_last, BinaryPredicate p );
template< class InputIt, class ForwardIt, class BinaryPredicate >
InputIt find_first_of( InputIt first, InputIt last,

                       ForwardIt s_first, ForwardIt s_last, BinaryPredicate p );
(2) (até C + 11)


(a partir do C++ 11)
Pesquisa o [first, last) gama para qualquer um dos elementos na [s_first, s_last) gama. A primeira versão utiliza operator== para comparar os elementos, a segunda versão usa o predicado binário dado p.
Original:
Searches the range [first, last) for any of the elements in the range [s_first, s_last). The first version uses operator== to compare the elements, the second version uses the given binary predicate p.
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Índice

[editar] Parâmetros

first, last -
a gama de elementos para examinar
Original:
the range of elements to examine
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s_first, s_last -
a gama de elementos para pesquisar
Original:
the range of elements to search for
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p - binary predicate which returns ​true if the elements should be treated as equal.

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

 bool pred(const Type1 &a, const Type2 &b);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The types  Type1 and  Type2 must be such that objects of types ForwardIt1 and ForwardIt2 can be dereferenced and then implicitly converted to  Type1 and  Type2 respectively.

Type requirements
-
InputIt must meet the requirements of InputIterator.
-
ForwardIt1 must meet the requirements of ForwardIterator.
-
ForwardIt2 must meet the requirements of ForwardIterator.

[editar] Valor de retorno

Iterador para o primeiro elemento na [first, last) intervalo que é igual a um elemento da [s_first; s_last) gama. Se nenhum elemento for encontrado, é retornado last.
Original:
Iterator to the first element in the range [first, last) that is equal to an element from the range [s_first; s_last). If no such element is found, last is returned.
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[editar] Complexidade

Será que a maioria das comparações dos (S*N) onde S = distance(s_first, s_last) e N = distance(first, last).
Original:
Does at most (S*N) comparisons where S = distance(s_first, s_last) and N = distance(first, last).
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[editar] Possível implementação

First version
template<class InputIt, class ForwardIt>
InputIt find_first_of(InputIt first, InputIt last,
                      ForwardIt s_first, ForwardIt s_last)
{
    for (; first != last; ++first) {
        for (ForwardIt it = s_first; it != s_last; ++it) {
            if (*first == *it) {
                return first;
            }
        }
    }
    return last;
}
Second version
template<class InputIt, class ForwardIt, class BinaryPredicate>
InputIt find_first_of(InputIt first, InputIt last,
                      ForwardIt s_first, ForwardIt s_last,
                      BinaryPredicate p)
{
    for (; first != last; ++first) {
        for (ForwardIt it = s_first; it != s_last; ++it) {
            if (p(*first, *it)) {
                return first;
            }
        }
    }
    return last;
}

[editar] Exemplo

As seguintes pesquisas de código para qualquer um dos números inteiros especificados em um vetor de números inteiros:
Original:
The following code searches for any of specified integers in a vector of integers:
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#include <algorithm>
#include <iostream>
#include <vector>
 
int main()
{
    std::vector<int> v{0, 2, 3, 25, 5};
    std::vector<int> t{3, 19, 10, 2};
 
    auto result = std::find_first_of(v.begin(), v.end(), t.begin(), t.end());
 
    if (result == v.end()) {
        std::cout << "no elements of v were equal to 3, 19, 10 or 2\n";
    } else {
        std::cout << "found a match at "
                  << std::distance(v.begin(), result) << "\n";
    }
 }

Output:

found a match at 1

[editar] Veja também

encontra o primeiro elemento satisfazer critérios específicos
Original:
finds the first element satisfying specific criteria
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(modelo de função) [edit]