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std::unary_negate

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initializer_list(C++11)
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Swap, forward and move
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swap
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Funzione oggetti
Funzione wrapper
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Operatore wrapper
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Negatori
Original:
Negators
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unary_negate
binary_negate
Sconsigliata a leganti e adattatori
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Deprecated binders and adaptors
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unary_function(deprecato)
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Defined in header <functional>
template< class Predicate >
struct unary_negate : public std::unary_function<Predicate::argument_type, bool>;
(C fino + 11)
template< class Predicate >
struct unary_negate;
(dal C++11)
unary_negate è un oggetto funzione wrapper restituisce il complemento del predicato unario che detiene.
Original:
unary_negate is a wrapper function object returning the complement of the unary predicate it holds.
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Il tipo di predicato unario deve definire un tipo di membro, argument_type, che è convertibile al tipo di parametro il predicato di. Gli oggetti funzione unari ottenuti da std::ref, std::cref, std::negate, std::logical_not, std::mem_fn, std::function, std::hash, o da un'altra chiamata a std::not1 hanno definito questo tipo, in quanto sono oggetti funzionali derivati ​​dalla std::unary_function deprecato.
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 oggetti sono facilmente costruiti con funzione di supporto std::not1.
Original:
unary_negate objects are easily constructed with helper function std::not1.
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Indice

[modifica] Membri tipi

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

[modifica] Membri funzioni

(constructor)
constructs a new unary_negate object with the supplied predicate
(membro pubblico funzione)
operator()
restituisce il complemento logico del risultato di una chiamata al predicato memorizzato
Original:
returns the logical complement of the result of a call to the stored predicate
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(membro pubblico funzione)

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 -
predicato funzione dell'oggetto
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 -
argomento di passare attraverso predicato
Original:
argument to pass through to predicate
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Return value

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

[modifica] Esempio

#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

[modifica] Vedi anche

funzione oggetto wrapper restituisce il complemento del predicato binario che detiene
Original:
wrapper function object returning the complement of the binary predicate it holds
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(classe template) [edit]
(C++11)
avvolge oggetto invocabile di qualsiasi tipo con la firma specificato chiamata di funzione
Original:
wraps callable object of any type with specified function call signature
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(classe template) [edit]
costruisce oggetto personalizzato std::unary_negate
Original:
constructs custom std::unary_negate object
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(funzione di modello) [edit]
(deprecato)
crea un adattatore compatibile con wrapper di oggetto funzione da un puntatore a funzione
Original:
creates an adaptor-compatible function object wrapper from a pointer to function
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(funzione di modello) [edit]
(deprecato)
adattatore compatibile unario classe base funzione
Original:
adaptor-compatible unary function base class
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(classe template) [edit]