Espaços nominais
Variantes
Acções

std::find, std::find_if, std::find_if_not

Da cppreference.com
< cpp‎ | algorithm


 
 
Biblioteca algoritmo
Funções
Original:
Functions
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Não modificar operações de seqüência
Original:
Non-modifying sequence operations
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find
find_if
find_if_not


(C++11)
find_end
find_first_of
adjacent_find
search
search_n
Modificando operações de seqüência
Original:
Modifying sequence operations
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Particionamento operações
Original:
Partitioning operations
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Operações de classificação (em intervalos ordenados)
Original:
Sorting operations (on sorted ranges)
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Binários operações de busca (em intervalos ordenados)
Original:
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
Original:
C library
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Defined in header <algorithm>
template< class InputIt, class T >
InputIt find( InputIt first, InputIt last, const T& value );
(1)
template< class InputIt, class UnaryPredicate >

InputIt find_if( InputIt first, InputIt last,

                 UnaryPredicate p );
(2)
template< class InputIt, class UnaryPredicate >

InputIt find_if_not( InputIt first, InputIt last,

                     UnaryPredicate q );
(3) (a partir do C++ 11)
Estas funções encontrar o primeiro elemento na [first, last) intervalo que satisfaz critérios específicos:
Original:
These functions find the first element in the range [first, last) that satisfies specific criteria:
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1. find procura por um elemento igual a value
Original:
1. find searches for an element equal to value
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2. find_if procura um elemento para o qual predicado p retornos true
Original:
2. find_if searches for an element for which predicate p returns true
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3. find_if_not pesquisas de elemento para o qual predicado q retornos false
Original:
3. find_if_not searches for element for which predicate q returns false
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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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value -
valor a comparar os elementos de
Original:
value to compare the elements to
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p - unary predicate which returns ​true
para o elemento desejado
Original:
for the required element
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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 InputIt can be dereferenced and then implicitly converted to Type. ​

q - unary predicate which returns ​false
para o elemento desejado
Original:
for the required element
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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 InputIt can be dereferenced and then implicitly converted to Type. ​

Type requirements
-
InputIt must meet the requirements of InputIterator.

[editar] Valor de retorno

Iterador para o primeiro elemento que satisfaça a condição ou last se nenhum elemento for encontrado.
Original:
Iterator to the first element satisfying the condition or last if no such element is found.
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[editar] Complexidade

No máximo last - first aplicações do predicado
Original:
At most last - first applications of the predicate
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[editar] Possível implementação

First version
template<class InputIt, class T>
InputIt find(InputIt first, InputIt last, const T& value)
{
    for (; first != last; ++first) {
        if (*first == value) {
            return first;
        }
    }
    return last;
}
Second version
template<class InputIt, class UnaryPredicate>
InputIt find_if(InputIt first, InputIt last, UnaryPredicate p)
{
    for (; first != last; ++first) {
        if (p(*first)) {
            return first;
        }
    }
    return last;
}
Third version
template<class InputIt, class UnaryPredicate>
InputIt find_if_not(InputIt first, InputIt last, UnaryPredicate q)
{
    for (; first != last; ++first) {
        if (!q(*first)) {
            return first;
        }
    }
    return last;
}
Se você não tem C + 11, equivalente a std::find_if_not é usar std::find_if com o predicado negado.
Original:
If you do not have C++11, an equivalent to std::find_if_not is to use std::find_if with the negated predicate.
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template<class InputIt, class UnaryPredicate>
InputIt find_if_not(InputIt first, InputIt last, UnaryPredicate q)
{
    return std::find_if(first, last, std::not1(q));
}

[editar] Exemplo

O exemplo a seguir localiza um número inteiro em um vetor de inteiros .
Original:
The following example finds an integer in a vector of integers.
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#include <iostream>
#include <algorithm>
#include <vector>
 
int main()
{
    int n1 = 3;
    int n2 = 5;
 
    std::vector<int> v{0, 1, 2, 3, 4};
 
    auto result1 = std::find(v.begin(), v.end(), n1);
    auto result2 = std::find(v.begin(), v.end(), n2);
 
    if (result1 != v.end()) {
        std::cout << "v contains: " << n1 << '\n';
    } else {
        std::cout << "v does not contain: " << n1 << '\n';
    }
 
    if (result2 != v.end()) {
        std::cout << "v contains: " << n2 << '\n';
    } else {
        std::cout << "v does not contain: " << n2 << '\n';
    }
}

Output:

v contains: 3
v does not contain: 5

[editar] Veja também

encontra dois idênticos (ou algum outro relacionamento) itens adjacentes uns aos outros
Original:
finds two identical (or some other relationship) items adjacent to each other
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(modelo de função) [edit]
encontra a última sequência de elementos em um determinado intervalo
Original:
finds the last sequence of elements in a certain range
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(modelo de função) [edit]
searches for any one of a set of elements
(modelo de função) [edit]
encontra a primeira posição em que dois intervalos diferentes
Original:
finds the first position where two ranges differ
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(modelo de função) [edit]
searches for a range of elements
(modelo de função) [edit]