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std::not1

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Defined in header <functional>
template< class Predicate >
std::unary_negate<Predicate> not1(const Predicate& pred);
not1 ist eine Hilfsfunktion, um eine Funktion Objekt, das das Komplement des unären Prädikat Funktion übergeben zurückgibt. Die Funktion Objekt erstellt ist vom Typ 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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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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Inhaltsverzeichnis

[Bearbeiten] Parameter

pred -
unären Prädikat
Original:
unary predicate
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[Bearbeiten] Rückgabewert

std::not1 gibt ein Objekt vom Typ std::unary_negate<Predicate> mit pred gebaut .
Original:
std::not1 returns an object of type std::unary_negate<Predicate>, constructed with pred.
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[Bearbeiten] Ausnahmen

None .
Original:
None.
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[Bearbeiten] Beispiel

#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

[Bearbeiten] Siehe auch

Wrapper-Funktion Objekt wieder das Komplement des unären Prädikat es hält
Original:
wrapper function object returning the complement of the unary 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::binary_negate Objekt
Original:
constructs custom std::binary_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]