Пространства имён
Варианты
Действия

std::not2

Материал из cppreference.com

This page has been machine-translated from the English version of the wiki using Google Translate.

The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here.

Click here for the English version of this page

 
C++
 
Утилиты библиотеки
 
Функция объектов
Функция обертки
Original:
Function wrappers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
function(C++11)
mem_fn(C++11)
bad_function_call(C++11)
Привязка
Original:
Bind
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
bind(C++11)
is_bind_expression(C++11)
is_placeholder(C++11)
_1, _2, _3, ...(C++11)
Ссылка обертки
Original:
Reference wrappers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
reference_wrapper(C++11)
ref
cref		(C++11)
(C++11)
Оператор обертки
Original:
Operator wrappers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Negators
Original:
Negators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
not1
not2
Устаревшие связующих и адаптеры
Original:
Deprecated binders and adaptors
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
unary_function(устарело)
binary_function(устарело)
ptr_fun(устарело)
pointer_to_unary_function(устарело)
pointer_to_binary_function(устарело)
mem_fun(устарело)
mem_fun_t
mem_fun1_t
const_mem_fun_t
const_mem_fun1_t		(устарело)
(устарело)
(устарело)
(устарело)
mem_fun_ref(устарело)
mem_fun_ref_t
mem_fun1_ref_t
const_mem_fun_ref_t
const_mem_fun1_ref_t		(устарело)
(устарело)
(устарело)
(устарело)
binder1st
binder2nd		(устарело)
(устарело)
bind1st
bind2nd		(устарело)
(устарело)
 
Заголовочный файл <functional>
template< class Predicate >
std::binary_negate<Predicate> not2(const Predicate& pred);
not2 является вспомогательной функцией для создания функционального объекта, который возвращает дополнение к бинарной функции предиката прошло. Функция объект, созданный имеет тип 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>.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Бинарного типа предикат должен определить два члена типа, first_argument_type и second_argument_type, которые могут быть конвертированы в параметре предиката типа. Функция объекты, полученные от 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 , или из другой вызов std::not2 эти типы определены, так же как и функции объектов, производных от устаревших std::binary_function.
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.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Содержание

[править] Параметры

pred -
унарный предикат
Original:
unary predicate
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[править] Возвращаемое значение

std::not2 возвращает объект типа std::binary_negate<Predicate>, построенные с pred.
Original:
std::not2 returns an object of type std::binary_negate<Predicate>, constructed with pred.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[править] Исключения

Ни.
Original:
None.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[править] Пример

#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';
 
}

Вывод: 

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

[править] См. также
Объект функции-оболочки возвращения дополнение к бинарным предикатом в ней хранится
Original:
wrapper function object returning the complement of the binary predicate it holds
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(шаблон класса) [edit]
(C++11)
обертывания вызываемый объект любого типа с заданной подписью вызова функции
Original:
wraps callable object of any type with specified function call signature
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(шаблон класса) [edit]
создает пользовательский объект std::unary_negate
Original:
constructs custom std::unary_negate object
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(шаблон функции) [edit]
(устарело)
создает адаптер-совместимые функции объекта обертку от указателя на функцию
Original:
creates an adaptor-compatible function object wrapper from a pointer to function
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(шаблон функции) [edit]
(устарело)
Адаптер-совместимых бинарной функции базового класса
Original:
adaptor-compatible binary function base class
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(шаблон класса) [edit]
Источник — «http://ru.cppreference.com/mwiki/index.php?title=cpp/utility/functional/not2&oldid=31483»