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std::function::operator()

提供: cppreference.com
< cpp‎ | utility‎ | functional‎ | function

 
 
ユーティリティライブラリ
支援を入力します (basic types, RTTI, type traits)
動的なメモリ管理
エラー処理
プログラムユーティリティ
可変個引数関数
日付と時刻
関数オブジェクト
initializer_list(C++11)
bitset
hash(C++11)
関係演算子
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
ペアとタプル
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
フォワード、スワップ、および移動
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
関数オブジェクト
関数ラッパー
Original:
Function wrappers
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function(C++11)
mem_fn(C++11)
bad_function_call(C++11)
バインド
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Bind
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bind(C++11)
is_bind_expression(C++11)
is_placeholder(C++11)
_1, _2, _3, ...(C++11)
リファレンス·ラッパー
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Reference wrappers
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reference_wrapper(C++11)
ref
cref
(C++11)
(C++11)
オペレーターのラッパー
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Operator wrappers
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否定子
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Negators
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バインダーおよびアダプタは非推奨になりました
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Deprecated binders and adaptors
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unary_function(廃止予定)
binary_function(廃止予定)
ptr_fun(廃止予定)
pointer_to_unary_function(廃止予定)
pointer_to_binary_function(廃止予定)
mem_fun(廃止予定)
mem_fun_t
mem_fun1_t
const_mem_fun_t
const_mem_fun1_t
(廃止予定)
(廃止予定)
(廃止予定)
(廃止予定)
mem_fun_ref(廃止予定)
mem_fun_ref_t
mem_fun1_ref_t
const_mem_fun_ref_t
const_mem_fun1_ref_t
(廃止予定)
(廃止予定)
(廃止予定)
(廃止予定)
binder1st
binder2nd
(廃止予定)
(廃止予定)
bind1st
bind2nd
(廃止予定)
(廃止予定)
 
std::function
メンバ関数
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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
非メンバ関数
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Non-member functions
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operator==
operator!=
std::swap(std::function)
ヘルパークラス
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Helper classes
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std::uses_allocator<std::function>
 
R operator()( ArgTypes... args ) const;
(C + + 11以来)

Calls the stored callable function target with the parameters args.

目次

[編集] パラメータ

args - parameters to pass to the stored callable function target

[編集] 値を返します

None if R is void. Otherwise the return value of the invocation of the stored callable object.

[編集] 例外

  • std::bad_function_call if *this does not store a callable function target, !*this == true.

[編集]

The following example shows how std::function can passed to other functions by value. Also, it shown how std::function can store lambdas.

#include <iostream>
#include <functional>
 
void call(std::function<int()> f)  // can be passed by value
{ 
    std::cout << f() << '\n';
}
 
int normal_function() 
{
    return 42;
}
 
int main()
{
    int n = 1;
    std::function<int()> f = [&n](){ return n; };
    call(f);
 
    n = 2;
    call(f); 
 
    f = normal_function; 
    call(f);
}

Output:

1
2
42

[編集] も参照してください