Namespace
Varianti

std::function

Da cppreference.com.
< cpp‎ | utility‎ | functional


 
 
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
Original:
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)
 
std::function
Membri funzioni
Original:
Member functions
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function::function
function::~function
function::operator=
function::swap
function::assign
function::operator bool
function::operator()
function::target_type
function::target
Non membri funzioni
Original:
Non-member functions
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operator==
operator!=
std::swap(std::function)
Helper classi
Original:
Helper classes
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std::uses_allocator<std::function>
 
Defined in header <functional>
template< class >
class function; /* undefined */
(dal C++11)
template< class R, class... Args >
class function<R(Args...)>
(dal C++11)
Modello std::function classe è un general-purpose wrapper di funzione polimorfa. Le istanze di std::function in grado di memorizzare, copiare, e richiamare qualsiasi callable bersaglio - funzioni, lambda espressioni, bind espressioni, o altri oggetti funzione.
Original:
Class template std::function is a general-purpose polymorphic function wrapper. Instances of std::function can store, copy, and invoke any callable target -- functions, lambda espressioni, bind espressioni, or other function objects.
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Indice

[modifica] Membri tipi

Tipo
Original:
Type
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Definition
result_type R
argument_type
T se sizeof...(Args)==1 e T è il primo tipo e solo in Args...
Original:
T if sizeof...(Args)==1 and T is the first and only type in Args...
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first_argument_type
T1 se sizeof...(Args)==2 T1 ed è il primo dei due tipi di Args...
Original:
T1 if sizeof...(Args)==2 and T1 is the first of the two types in Args...
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second_argument_type
T2 se sizeof...(Args)==2 e T2 è il secondo dei due tipi di Args...
Original:
T2 if sizeof...(Args)==2 and T2 is the second of the two types in Args...
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[modifica] Membri funzioni

costruisce una nuova istanza std::function
Original:
constructs a new std::function instance
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(membro pubblico funzione) [edit]
distrugge un'istanza std::function
Original:
destroys a std::function instance
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(membro pubblico funzione) [edit]
assegna il contenuto
Original:
assigns the contents
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(membro pubblico funzione) [edit]
swap il contenuto
Original:
swaps the contents
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(membro pubblico funzione) [edit]
assegna un nuovo obiettivo
Original:
assigns a new target
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(membro pubblico funzione) [edit]
Verifica se un bersaglio valido è contenuto
Original:
checks if a valid target is contained
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(membro pubblico funzione) [edit]
invoca il bersaglio
Original:
invokes the target
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(membro pubblico funzione) [edit]
Mirate accesso
Original:
Target access
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ottiene il typeid del target memorizzato di un std::function
Original:
obtains the typeid of the stored target of a std::function
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(membro pubblico funzione) [edit]
ottiene un puntatore al target memorizzato di un std::function
Original:
obtains a pointer to the stored target of a std::function
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(membro pubblico funzione) [edit]

[modifica] Non membri funzioni

specializzata l'algoritmo std::swap
Original:
specializes the std::swap algorithm
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(funzione di modello) [edit]
confronta con un std::function std::nullptr
Original:
compares an std::function with std::nullptr
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(funzione di modello)

[modifica] Helper classi

specializzata il tratto tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(classe modello di specializzazione) [edit]

[modifica] Esempio

#include <functional>
#include <iostream>
 
struct Foo {
    Foo(int num) : num_(num) {}
    void print_add(int i) const { std::cout << num_+i << '\n'; }
    int num_;
};
 
void print_num(int i)
{
    std::cout << i << '\n';
}
 
int main()
{
    // store a free function
    std::function<void(int)> f_display = print_num;
    f_display(-9);
 
    // store a lambda
    std::function<void()> f_display_42 = []() { print_num(42); };
    f_display_42();
 
    // store the result of a call to std::bind
    std::function<void()> f_display_31337 = std::bind(print_num, 31337);
    f_display_31337();
 
    // store a call to a member function
    std::function<void(const Foo&, int)> f_add_display = &Foo::print_add;
    Foo foo(314159);
    f_add_display(foo, 1);
}

Output:

-9
42
31337
314160

[modifica] Vedi anche

l'eccezione generata quando si invoca un std::function vuoto
Original:
the exception thrown when invoking an empty std::function
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(classe) [edit]
(C++11)
crea un oggetto funzione di un puntatore a un membro
Original:
creates a function object out of a pointer to a member
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(funzione di modello) [edit]