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std::not1

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Defined in header <functional>
template< class Predicate >
std::unary_negate<Predicate> not1(const Predicate& pred);
not1 é uma função auxiliar para criar um objecto de função que retorna o complemento da função de predicado unário passou. O objeto função criada é de std::unary_negate<Predicate> tipo.
Original:
not1 is a helper function to create a function object that returns the complement of the unary predicate function passed. The function object created is of type std::unary_negate<Predicate>.
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O tipo de predicado unário deve definir um tipo de membro, argument_type, que é conversível para o tipo de predicado de parâmetro. Os objectos obtidos a partir da função unários std::ref, std::cref, std::negate, std::logical_not, std::mem_fn, std::function, std::hash, ou a partir de outra chamada para std::not1 têm este tipo definido, assim como os objectos funcionais derivados da std::unary_function preterido.
Original:
The unary predicate type must define a member type, argument_type, that is convertible to the predicate's parameter type. The unary function objects obtained from std::ref, std::cref, std::negate, std::logical_not, std::mem_fn, std::function, std::hash, or from another call to std::not1 have this type defined, as are function objects derived from the deprecated std::unary_function.
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Índice

[editar] Parâmetros

pred -
predicado unário
Original:
unary predicate
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[editar] Valor de retorno

std::not1 retorna um objeto do tipo std::unary_negate<Predicate>, construído com pred.
Original:
std::not1 returns an object of type std::unary_negate<Predicate>, constructed with pred.
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[editar] Exceções

Nenhum.
Original:
None.
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[editar] Exemplo

#include <algorithm>
#include <functional>
#include <iostream>
#include <vector>
 
struct LessThan7 : std::unary_function<int, bool>
{
    bool operator()(int i) const { return i < 7; }
};
 
int main()
{
    std::vector<int> v;
    for (int i = 0; i < 10; ++i) {
        v.push_back(i);
    }
 
    std::cout << std::count_if(v.begin(), v.end(), std::not1(LessThan7())) << "\n";
 
    //same as above, but use a lambda function
    std::function<int(int)> less_than_9 = [](int x){ return x < 9; };
    std::cout << std::count_if(v.begin(), v.end(), std::not1(less_than_9)) << "\n";
}

Output:

3

[editar] Veja também

objeto função wrapper retornando o complemento do predicado unário que detém
Original:
wrapper function object returning the complement of the unary predicate it holds
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(modelo de classe) [edit]
(C++11)
envolve objeto que pode ser chamado de qualquer tipo com a assinatura especificada função chamada
Original:
wraps callable object of any type with specified function call signature
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(modelo de classe) [edit]
constrói objeto std::binary_negate personalizado
Original:
constructs custom std::binary_negate object
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(modelo de função) [edit]
(obsoleta)
cria um adaptador compatível com invólucro objeto de função de um ponteiro para função
Original:
creates an adaptor-compatible function object wrapper from a pointer to function
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(modelo de função) [edit]
(obsoleta)
adaptador compatível classe base unário função
Original:
adaptor-compatible unary function base class
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(modelo de classe) [edit]