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std::not2

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< cpp‎ | utility‎ | functional

 
 
 
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Bind
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Operator wrappers
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Négateurs
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Negators
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unary_function (obsolète)
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Defined in header <functional>
template< class Predicate >
std::binary_negate<Predicate> not2(const Predicate& pred);
not2 est une fonction d'assistance pour créer un objet fonction qui renvoie le complément de la fonction de prédicat binaire transmis. L'objet créé est fonction du type de 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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Le type de prédicat binaire devez définir deux types de membres, first_argument_type et second_argument_type, qui sont convertibles à des types de paramètres de l'jacentes. Les objets obtenus à partir de la fonction 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 , ou d'un autre appel à std::not2 avoir ces types définis, de même que les objets issus de la fonction std::binary_function obsolète .
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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Sommaire

[modifier] Paramètres

pred -
prédicat unaire
Original:
unary predicate
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[modifier] Retourne la valeur

std::not2 retourne un objet de std::binary_negate<Predicate> type, construits avec pred .
Original:
std::not2 returns an object of type std::binary_negate<Predicate>, constructed with pred.
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[modifier] Exceptions

Aucun .
Original:
None.
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[modifier] Exemple

#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';
 
}

Résultat :

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

[modifier] Voir aussi

foncteur retournant le complémentaire d'un foncteur existant, de type prédicat binaire
(classe générique) [edit]
(C++11)
adaptateur générique de foncteur
(classe générique) [edit]
fonction permettant de construire un objet de type std::unary_negate
(fonction générique) [edit]
(obsolète)
crée un foncteur à partir d'une fonction
(fonction générique) [edit]
(obsolète)
classe de base pour définir des foncteurs à 2 paramètres
(classe générique) [edit]