Espaços nominais
Variantes
Acções

std::function

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< cpp‎ | utility‎ | functional


 
 
Biblioteca de utilitários
Digite apoio (basic types, RTTI, type traits)
Gerenciamento de memória dinâmica
De tratamento de erros
Utilidades do programa
Variadic funções
Data e hora
Objetos de função
initializer_list(C++11)
bitset
hash(C++11)
Os operadores relacionais
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares e tuplas
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Troque, avançar e avançar
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Objetos de função
Invólucros de função
Original:
Function wrappers
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function(C++11)
mem_fn(C++11)
bad_function_call(C++11)
Ligar
Original:
Bind
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bind(C++11)
is_bind_expression(C++11)
is_placeholder(C++11)
_1, _2, _3, ...(C++11)
Invólucros de referência
Original:
Reference wrappers
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reference_wrapper(C++11)
ref
cref
(C++11)
(C++11)
Invólucros operador
Original:
Operator wrappers
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Negadores
Original:
Negators
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Obsoleta ligantes e adaptadores
Original:
Deprecated binders and adaptors
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unary_function(obsoleta)
binary_function(obsoleta)
ptr_fun(obsoleta)
pointer_to_unary_function(obsoleta)
pointer_to_binary_function(obsoleta)
mem_fun(obsoleta)
mem_fun_t
mem_fun1_t
const_mem_fun_t
const_mem_fun1_t
(obsoleta)
(obsoleta)
(obsoleta)
(obsoleta)
mem_fun_ref(obsoleta)
mem_fun_ref_t
mem_fun1_ref_t
const_mem_fun_ref_t
const_mem_fun1_ref_t
(obsoleta)
(obsoleta)
(obsoleta)
(obsoleta)
binder1st
binder2nd
(obsoleta)
(obsoleta)
bind1st
bind2nd
(obsoleta)
(obsoleta)
 
std::function
Funções de membro
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
Não-membros funções
Original:
Non-member functions
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operator==
operator!=
std::swap(std::function)
Classes auxiliares
Original:
Helper classes
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std::uses_allocator<std::function>
 
Defined in header <functional>
template< class >
class function; /* undefined */
(a partir do C++ 11)
template< class R, class... Args >
class function<R(Args...)>
(a partir do C++ 11)
std::function modelo de classe é um general-purpose invólucro função polimórfica. Instâncias de std::function pode armazenar, copiar, e invocar qualquer alvo exigível - funções, expressões lambda, expressões ligar, ou outros objetos de função.
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, expressões lambda, expressões ligar, or other function objects.
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Índice

[editar] Tipos de membro

Tipo
Original:
Type
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Definition
result_type R
argument_type
T se sizeof...(Args)==1 e T é o primeiro tipo e apenas em 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 e é o primeiro dos dois tipos em 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 T2 e é o segundo dos dois tipos de Args...
Original:
T2 if sizeof...(Args)==2 and T2 is the second of the two types in Args...
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[editar] Funções de membro

constrói um exemplo std::function novo
Original:
constructs a new std::function instance
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(função pública membro) [edit]
destrói uma instância std::function
Original:
destroys a std::function instance
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(função pública membro) [edit]
atribui o conteúdo
Original:
assigns the contents
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(função pública membro) [edit]
Trocar o conteúdo
Original:
swaps the contents
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(função pública membro) [edit]
atribui um novo alvo
Original:
assigns a new target
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(função pública membro) [edit]
verifica se um alvo válido é contido
Original:
checks if a valid target is contained
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(função pública membro) [edit]
invoca o alvo
Original:
invokes the target
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(função pública membro) [edit]
Alvo de acesso
Original:
Target access
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obtém o typeid do alvo armazenados de uma std::function
Original:
obtains the typeid of the stored target of a std::function
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(função pública membro) [edit]
obtém um ponteiro para o alvo de um std::function armazenado
Original:
obtains a pointer to the stored target of a std::function
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(função pública membro) [edit]

[editar] Não-membros funções

o algoritmo especializado std::swap
Original:
specializes the std::swap algorithm
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(modelo de função) [edit]
compara com um std::function std::nullptr
Original:
compares an std::function with std::nullptr
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(modelo de função)

[editar] Classes auxiliares

especializa o traço tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(especialização modelo. classe) [edit]

[editar] Exemplo

#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

[editar] Veja também

a exceção lançada quando invocar um std::function vazio
Original:
the exception thrown when invoking an empty std::function
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(classe) [edit]
(C++11)
cria um objecto de função de um apontador para um membro
Original:
creates a function object out of a pointer to a member
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(modelo de função) [edit]