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std::not2

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< cpp‎ | utility‎ | functional

 
 
 
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Defined in header <functional>
template< class Predicate >
std::binary_negate<Predicate> not2(const Predicate& pred);
not2 ist eine Hilfsfunktion, um eine Funktion Objekt, das das Komplement der binären Prädikats-Funktion übergeben zurückgibt. Die Funktion Objekt erstellt ist vom Typ std::binary_negate<Predicate> .
Original:
not2 is a helper function to create a function object that returns the complement of the binary predicate function passed. The function object created is of type std::binary_negate<Predicate>.
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Die binäre Prädikat Typ muss definieren zwei Elementtypen, first_argument_type und second_argument_type, die umwandelbar in das Prädikat der Parameter Typen sind. Die Funktion Objekte aus std::owner_less erhalten, std::ref, std::cref, std::plus, std::minus, std::multiplies, std::divides, std::modulus, std::equal_to, std::not_equal_to, std::greater, std::less, std::greater_equal, std::less_equal, std::logical_not, std::logical_or, std::bit_and, std::bit_or, std::bit_xor, std::mem_fn, std::map::value_comp, std::multimap::value_comp, std::function oder aus einem anderen Anruf an std::not2 haben diese Arten definiert, als Funktion von Objekten aus der veralteten std::binary_function abgeleitet sind .
Original:
The binary predicate type must define two member types, first_argument_type and second_argument_type, that are convertible to the predicate's parameter types. The function objects obtained from std::owner_less, std::ref, std::cref, std::plus, std::minus, std::multiplies, std::divides, std::modulus, std::equal_to, std::not_equal_to, std::greater, std::less, std::greater_equal, std::less_equal, std::logical_not, std::logical_or, std::bit_and, std::bit_or, std::bit_xor, std::mem_fn, std::map::value_comp, std::multimap::value_comp, std::function, or from another call to std::not2 have these types defined, as are function objects derived from the deprecated std::binary_function.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

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

std::not2 gibt ein Objekt vom Typ std::binary_negate<Predicate> mit pred gebaut .
Original:
std::not2 returns an object of type std::binary_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 old_same : std::binary_function<int, int, bool>
{
    bool operator()(int a, int b) const { return a == b; }
};
 
struct new_same
{
    bool operator()(int a, int b) const { return a == b; }
};
 
bool same_fn(int a, int b)
{
    return a == b;
}
 
 
int main()
{
    std::vector<int> v1{0, 1, 2};
    std::vector<int> v2{2, 1, 0};
    std::vector<bool> v3(v1.size());
 
    std::cout << "negating a binary_function:\n";
    std::transform(v1.begin(), v1.end(), v2.begin(), v3.begin(),
                   std::not2(old_same()));
 
    std::cout << std::boolalpha;
    for (std::size_t i = 0; i < v1.size(); ++i)
        std::cout << v1[i] << ' ' << v2[i] << ' ' << v3[i] << '\n';
 
    std::cout << "negating a standard functor:\n";
    std::transform(v1.begin(), v1.end(), v2.begin(), v3.begin(),
                   std::not2(std::equal_to<int>()));
 
    for (std::size_t i = 0; i < v1.size(); ++i)
        std::cout << v1[i] << ' ' << v2[i] << ' ' << v3[i] << '\n';
 
    std::cout << "negating a std::function:\n";
    std::transform(v1.begin(), v1.end(), v2.begin(), v3.begin(),
                   std::not2(std::function<bool(int,int)>(new_same())));
 
    for (std::size_t i = 0; i < v1.size(); ++i)
        std::cout << v1[i] << ' ' << v2[i] << ' ' << v3[i] << '\n';
 
    std::cout << "negating a std::reference_wrapper:\n";
    std::transform(v1.begin(), v1.end(), v2.begin(), v3.begin(),
                   std::not2(std::ref(same_fn)));
 
    for (std::size_t i = 0; i < v1.size(); ++i)
        std::cout << v1[i] << ' ' << v2[i] << ' ' << v3[i] << '\n';
 
}

Output:

negating a binary_function:
0 2 true
1 1 false
2 0 true
negating a standard functor:
0 2 true
1 1 false
2 0 true
negating a std::function:
0 2 true
1 1 false
2 0 true
negating a std::reference_wrapper:
0 2 true
1 1 false
2 0 true

[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]
Adapter kompatibel Binärfunktion Basisklasse
Original:
adaptor-compatible binary function base class
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(Klassen-Template) [edit]