名前空間
変種
操作

std::function

提供: cppreference.com
< cpp‎ | utility‎ | functional


 
 
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
Original:
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
Original:
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
Original:
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
Original:
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
Original:
Operator wrappers
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否定子
Original:
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
Original:
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
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
非メンバ関数
Original:
Non-member functions
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operator==
operator!=
std::swap(std::function)
ヘルパークラス
Original:
Helper classes
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std::uses_allocator<std::function>
 
Defined in header <functional>
template< class >
class function; /* undefined */
(C + + 11以来)
template< class R, class... Args >
class function<R(Args...)>
(C + + 11以来)

テンプレートクラスstd::functionは汎用で多態な関数ラッパーです。 std::functionのインスタンスは任意の呼び出し可能な「ターゲット」(関数、ラムダ式バインド式、その他の関数オブジェクト)を格納したり、コピーしたり、呼び出したりできます。

目次

[編集] メンバータイプ

タイプ
Original:
Type
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Definition
result_type R
argument_type
T場合sizeof...(Args)==1TArgs...で最初で唯一のタイプです
Original:
T if sizeof...(Args)==1 and T is the first and only type in Args...
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first_argument_type
T1場合sizeof...(Args)==2T1Args...の2つのタイプの最初のものです
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場合sizeof...(Args)==2T2Args...の2つのタイプの2番目で​​す
Original:
T2 if sizeof...(Args)==2 and T2 is the second of the two types in Args...
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[編集] メンバ関数

新しいstd::functionインスタンスを構築します
Original:
constructs a new std::function instance
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(パブリックメンバ関数) [edit]
std::functionインスタンスを破棄します
Original:
destroys a std::function instance
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(パブリックメンバ関数) [edit]
内容が割り当てられます
Original:
assigns the contents
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(パブリックメンバ関数) [edit]
スワップ内容
Original:
swaps the contents
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(パブリックメンバ関数) [edit]
新しいターゲットを割り当てます
Original:
assigns a new target
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(パブリックメンバ関数) [edit]
有効なターゲットであればチェックが含まれています
Original:
checks if a valid target is contained
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(パブリックメンバ関数) [edit]
ターゲットを呼び出します
Original:
invokes the target
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(パブリックメンバ関数) [edit]
ターゲットアクセス
Original:
Target access
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typeidの格納されたターゲットのstd::functionを取得します
Original:
obtains the typeid of the stored target of a std::function
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(パブリックメンバ関数) [edit]
std::functionの格納されたターゲットへのポインタを取得します
Original:
obtains a pointer to the stored target of a std::function
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(パブリックメンバ関数) [edit]

[編集] 非メンバ関数

std::swapアルゴリズムを専門としています
Original:
specializes the std::swap algorithm
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(関数テンプレート) [edit]
std::functionstd::nullptrを比較します
Original:
compares an std::function with std::nullptr
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(関数テンプレート)

[編集] ヘルパークラス

std::uses_allocator型形質を専門としています
Original:
specializes the std::uses_allocator type trait
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(クラステンプレートの特殊化の2つの値を比較します) [edit]

[編集]

#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

[編集] 参照

空のstd::functionを呼び出すときに例外がスローされます
Original:
the exception thrown when invoking an empty std::function
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(クラス) [edit]
(C++11)
メンバへのポインタの関数オブジェクトを作成します
Original:
creates a function object out of a pointer to a member
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(関数テンプレート) [edit]