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std::not1

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initializer_list(C++11)
bitset
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pair
tuple(C++11)
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Swap, forward and move
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swap
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Funzione wrapper
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Negatori
Original:
Negators
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not1
not2
Sconsigliata a leganti e adattatori
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unary_function(deprecato)
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(deprecato)
(deprecato)
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Defined in header <functional>
template< class Predicate >
std::unary_negate<Predicate> not1(const Predicate& pred);
not1 è una funzione di supporto per creare un oggetto funzione che restituisce il complemento della funzione predicativa unaria passato. L'oggetto creato è funzione del tipo std::unary_negate<Predicate>.
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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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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Indice

[modifica] Parametri

pred -
predicato unario
Original:
unary predicate
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[modifica] Valore di ritorno

std::not1 restituisce un oggetto di tipo std::unary_negate<Predicate>, costruito con pred.
Original:
std::not1 returns an object of type std::unary_negate<Predicate>, constructed with pred.
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[modifica] Eccezioni

Nessuno.
Original:
None.
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[modifica] Esempio

#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

[modifica] Vedi anche

funzione oggetto wrapper restituisce il complemento del predicato unario che detiene
Original:
wrapper function object returning the complement of the unary 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::binary_negate
Original:
constructs custom std::binary_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]