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std::binary_function

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C++
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
Data e ora
Funzione oggetti
initializer_list(C++11)
bitset
hash(C++11)
Gli operatori relazionali
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Funzione oggetti
Funzione wrapper
Original:
Function wrappers
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function(C++11)
mem_fn(C++11)
bad_function_call(C++11)
Associare
Original:
Bind
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bind(C++11)
is_bind_expression(C++11)
is_placeholder(C++11)
_1, _2, _3, ...(C++11)
Wrapper di riferimento
Original:
Reference wrappers
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reference_wrapper(C++11)
ref
cref		(C++11)
(C++11)
Operatore wrapper
Original:
Operator wrappers
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Negatori
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Negators
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Sconsigliata a leganti e adattatori
Original:
Deprecated binders and adaptors
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unary_function(deprecato)
binary_function(deprecato)
ptr_fun(deprecato)
pointer_to_unary_function(deprecato)
pointer_to_binary_function(deprecato)
mem_fun(deprecato)
mem_fun_t
mem_fun1_t
const_mem_fun_t
const_mem_fun1_t		(deprecato)
(deprecato)
(deprecato)
(deprecato)
mem_fun_ref(deprecato)
mem_fun_ref_t
mem_fun1_ref_t
const_mem_fun_ref_t
const_mem_fun1_ref_t		(deprecato)
(deprecato)
(deprecato)
(deprecato)
binder1st
binder2nd		(deprecato)
(deprecato)
bind1st
bind2nd		(deprecato)
(deprecato)
 
Elemento definito nell'header <functional>
template<

    class Arg1,
    class Arg2,
    class Result

> struct binary_function;
 (deprecato)
binary_function è una classe di base per la creazione di oggetti funzione con due argomenti.
Original:
binary_function is a base class for creating function objects with two arguments.
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binary_function non operator() definire, si prevede che le classi derivate definirà questo. binary_function fornisce solo tre tipi - first_argument_type, second_argument_type e result_type - definito dai parametri di modello.
Original:
binary_function does not define operator(); it is expected that derived classes will define this. binary_function provides only three types - first_argument_type, second_argument_type and result_type - defined by the template parameters.
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Alcuni biblioteca standard adattatori oggetto funzione, come ad esempio std::not2, richiedono gli oggetti funzione si adattano ad avere certi tipi definita; std::not2 richiede l'oggetto funzione essendo atto di avere due tipi denominati first_argument_type e second_argument_type. Derivazione di oggetti funzione che prendono due argomenti da binary_function è un modo semplice per renderli compatibili con tali schede.
Original:
Some standard library function object adaptors, such as std::not2, require the function objects they adapt to have certain types defined; std::not2 requires the function object being adapted to have two types named first_argument_type and second_argument_type. Deriving function objects that take two arguments from binary_function is an easy way to make them compatible with those adaptors.
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binary_function è deprecato in C + +11. La sua funzionalità è stata resa obsoleta da std::function e altri oggetti standard di funzioni della libreria, che definiscono i tipi necessari.
Original:
binary_function is deprecated in C++11. Its functionality has been made obsolete by std::function and other standard library function objects, which define the necessary types.
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[modifica] Membri tipi

Tipo
Original:
Type
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 Definition
first_argument_type Arg1
second_argument_type Arg2
result_type Result

[modifica] Esempio

#include <algorithm>
#include <functional>
#include <iostream>
#include <vector>
 
struct same : std::binary_function<int, int, bool>
{
    bool operator()(int a, int b) const { return a == b; }
};
 
int main()
{
    std::vector<int> v1{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    std::vector<int> v2{10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 };
    std::vector<bool> v3(v1.size());
 
    std::transform(v1.begin(), v1.end(), v2.begin(), v3.begin(), std::not2(same()));
 
    std::cout << std::boolalpha;
    for (std::size_t i = 0; i < v1.size(); ++i)
        std::cout << v1[i] << ' ' << v2[i] << ' ' << v3[i] << '\n';
}

Output: 

0 10 true
1 9 true
2 8 true
3 7 true
4 6 true
5 5 false
6 4 true
7 3 true
8 2 true
9 1 true

[modifica] Vedi anche

(C++11)
avvolge oggetto invocabile di qualsiasi tipo con la firma specificato chiamata di funzione
Original:
wraps callable object of any type with specified function call signature
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(classe template) [modifica]
(deprecato)
crea un adattatore compatibile con wrapper di oggetto funzione da un puntatore a funzione
Original:
creates an adaptor-compatible function object wrapper from a pointer to function
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(funzione di modello) [modifica]
(deprecato)
adattatore compatibile wrapper per un puntatore a funzione binaria
Original:
adaptor-compatible wrapper for a pointer to binary function
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(classe template) [modifica]
(deprecato)
adattatore compatibile unario classe base funzione
Original:
adaptor-compatible unary function base class
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(classe template) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/utility/functional/binary_function&oldid=27144"