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std::unary_negate

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Defined in header <functional>
template< class Predicate >
struct unary_negate : public std::unary_function<Predicate::argument_type, bool>;
(até C + 11)
template< class Predicate >
struct unary_negate;
(a partir do C++ 11)
unary_negate é um objeto função wrapper retornando o complemento do predicado unário que detém.
Original:
unary_negate is a wrapper function object returning the complement of the unary predicate it holds.
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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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unary_negate objetos são facilmente construídos com a função de ajudante std::not1.
Original:
unary_negate objects are easily constructed with helper function std::not1.
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Índice

[editar] Tipos de membro

Tipo
Original:
Type
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Definition
argument_type Predicate::argument_type
result_type bool

[editar] Funções de membro

(constructor)
constructs a new unary_negate object with the supplied predicate
(função pública membro)
operator()
retorna o complemento lógico de o resultado de uma chamada para o predicado armazenado
Original:
returns the logical complement of the result of a call to the stored predicate
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(função pública membro)

std :: unary_negate ::
Original:
std::unary_negate::
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unary_negate

explicit unary_negate( Predicate const& pred );

Constructs a unary_negate function object with the stored predicate pred.

Parameters

pred -
objeto função de predicado
Original:
predicate function object
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std :: unary_negate ::
Original:
std::unary_negate::
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operator()

bool operator()( argument_type const& x ) const;

Returns the logical complement of the result of calling pred(x).

Parameters

x -
argumento para passar para predicado
Original:
argument to pass through to predicate
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Return value

The logical complement of the result of calling pred(x).

[editar] Exemplo

#include <algorithm>
#include <functional>
#include <iostream>
#include <vector>
 
struct less_than_7 : 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::unary_negate<less_than_7> not_less_than_7((less_than_7()));
 
    std::cout << std::count_if(v.begin(), v.end(), not_less_than_7);
 
    /* C++11 solution:
        // Use std::function<bool (int)>
        std::function<bool (int)> not_less_than_7 =
            [](int x)->bool{ return !less_than_7()(x); };
 
        std::cout << std::count_if(v.begin(), v.end(), not_less_than_7);
    */
}

Output:

3

[editar] Veja também

objeto função wrapper retornando o complemento do predicado binário que detém
Original:
wrapper function object returning the complement of the binary 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::unary_negate personalizado
Original:
constructs custom std::unary_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]