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std::not1

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< cpp‎ | utility‎ | functional

 
 
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Defined in header <functional>
template< class Predicate >
std::unary_negate<Predicate> not1(const Predicate& pred);
not1 es una función auxiliar para crear un objeto de función que devuelve el complemento de la función de predicado unario pasado. El objeto creado es función 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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El tipo de predicado unario debe definir un tipo de miembro, argument_type, que se puede convertir en el tipo de parámetro del predicado. Los objetos de la función unarios obtenidos de std::ref, std::cref, std::negate, std::logical_not, std::mem_fn, std::function, std::hash, o de otra llamada a std::not1 han definido este tipo, como son objetos función derivada de la std::unary_function obsoleto .
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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Contenido

[editar] Parámetros

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

std::not1 devuelve un objeto de tipo std::unary_negate<Predicate>, construido con pred .
Original:
std::not1 returns an object of type std::unary_negate<Predicate>, constructed with pred.
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[editar] Excepciones

Ninguno .
Original:
None.
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[editar] Ejemplo

#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] Ver también

objeto contenedor función que devuelve el complemento del predicado unario que contiene
Original:
wrapper function object returning the complement of the unary predicate it holds
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(clase de plantilla) [edit]
(C++11)
envuelve objeto que se puede llamar de cualquier tipo con la firma especificada llamada de función
Original:
wraps callable object of any type with specified function call signature
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(clase de plantilla) [edit]
construye std::binary_negate objeto personalizado
Original:
constructs custom std::binary_negate object
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(función de plantilla) [edit]
(obsoleto)
crea un adaptador compatible con envoltura objeto de la función de puntero a función
Original:
creates an adaptor-compatible function object wrapper from a pointer to function
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(función de plantilla) [edit]
(obsoleto)
adaptador compatible con la clase base de la función unaria
Original:
adaptor-compatible unary function base class
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(clase de plantilla) [edit]