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std::unary_negate

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< cpp‎ | utility‎ | functional

 
 
 
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Verneinung
unary_negate
binary_negate
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unary_function(veraltet)
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Defined in header <functional>
template< class Predicate >
struct unary_negate : public std::unary_function<Predicate::argument_type, bool>;
(bis C + +11)
template< class Predicate >
struct unary_negate;
(seit C++11)
unary_negate ist ein Wrapper-Funktion Objekt wieder das Komplement des unären Prädikat es hält .
Original:
unary_negate is a wrapper function object returning the complement of the unary predicate it holds.
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Der unäre Prädikate Typ muss definieren, ein Mitglied Typ argument_type, die umwandelbar in das Prädikat der Parameter-Typ ist. Die einstellige Funktion Objekte aus std::ref erhalten, std::cref, std::negate, std::logical_not, std::mem_fn, std::function, std::hash, oder von einem anderen Anruf zu std::not1 diese Art definiert haben, als Funktion von Objekten aus der veralteten std::unary_function abgeleitet sind .
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 Objekte werden einfach mit Hilfsfunktion std::not1 gebaut .
Original:
unary_negate objects are easily constructed with helper function std::not1.
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Inhaltsverzeichnis

[Bearbeiten] Mitglied Typen

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

[Bearbeiten] Member-Funktionen

(constructor)
constructs a new unary_negate object with the supplied predicate
(öffentliche Elementfunktion)
operator()
gibt das logische Komplement des Ergebnisses eines Anrufs zu dem gespeicherten Prädikat
Original:
returns the logical complement of the result of a call to the stored predicate
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(öffentliche Elementfunktion)

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 -
Prädikatfunktion Objekt
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 -
Argument bis zum Prädikat übergeben
Original:
argument to pass through to predicate
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Return value

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

[Bearbeiten] Beispiel

#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

[Bearbeiten] Siehe auch

Wrapper-Funktion Objekt wieder das Komplement der binären Prädikats es hält
Original:
wrapper function object returning the complement of the binary predicate it holds
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(Klassen-Template) [edit]
(C++11)
wickelt aufrufbare Objekt eines beliebigen Typs mit dem angegebenen Funktion Call-Signatur
Original:
wraps callable object of any type with specified function call signature
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(Klassen-Template) [edit]
baut kundenspezifische std::unary_negate Objekt
Original:
constructs custom std::unary_negate object
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(Funktions-Template) [edit]
(veraltet)
schafft eine Adapter-kompatiblen Funktion Objekt-Wrapper von einem Zeiger auf eine Funktion
Original:
creates an adaptor-compatible function object wrapper from a pointer to function
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(Funktions-Template) [edit]
(veraltet)
Adapter kompatibel einstellige Funktion Basisklasse
Original:
adaptor-compatible unary function base class
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(Klassen-Template) [edit]