std::forward_as_tuple

 

C++

言語

コンセプト

ユーティリティライブラリ

ストリングスライブラリ

コンテナライブラリ

アルゴリズムライブラリ

イテレータライブラリ

ニューメリックスライブラリ

入力/出力ライブラリ

ローカライゼーションライブラリ

正規表現ライブラリ (C++11)

アトミック操作ライブラリ (C++11)

スレッドのサポートライブラリ (C++11)

 

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

ペアとタプル Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

declval (C++11)

 

std::tuple

メンバ関数 Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple::tuple

tuple::operator=

tuple::swap

非メンバ関数 Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

make_tuple

tie

forward_as_tuple

None

operator= operator!= operator< operator<= operator> operator>=

std::swap

get

ヘルパークラス Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple_size

tuple_element

uses_allocator

ignore

 

Defined in header <tuple>
template< class... Types > tuple<Types...> forward_as_tuple( Types&&... args );		(C + + 11以来)

関数への引数として転送するのに適しargsの引数への参照のタプルを構築します。タプルは右辺値が引数として使用されているとき右辺値参照データメンバを持つ、それ以外は左辺値参照データメンバを持っています。右辺値が使用されている場合、この関数の結果は次のシーケンスポイントの前に消費しなければならない.

Original:

Constructs a tuple of references to the arguments in args suitable for forwarding as an argument to a function. The tuple has rvalue reference data members when rvalues are used as arguments, and otherwise has lvalue reference data members. If rvalues are used, the result of this function must be consumed before the next sequence point.

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パラメータ

args

-

からタプルを構築するためにゼロ個以上の引数 Original: zero or more arguments to construct the tuple from The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

値を返します

std::tupleオブジェクトはstd::tuple<Types&&...>(std::forward<Types>(args)...)たかのように作成しました

Original:

A std::tuple object created as if by std::tuple<Types&&...>(std::forward<Types>(args)...)

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例外

noexcept specification:  

noexcept

  (C + + 11以来)

例

#include <iostream>
#include <map>
#include <tuple>
#include <string>
 
int main()
{
    std::map<int, std::string> m;
 
    // same as m.emplace(10, 20, 'a');
    m.emplace(std::forward_as_tuple(10, std::string(20, 'a')));
    std::cout << "m[10] = " << m[10] << '\n';
 
    // The following is an error: it produces a
    // std::tuple<int&&, std::string&&> holding two dangling references.
    //
    // auto t = std::forward_as_tuple(10, std::string(20, 'a'));
    // m.emplace(t);
}

Output:

m[10] = aaaaaaaaaaaaaaaaaaaa

make_tuple	引数の型で定義された型のtupleオブジェクトを作成します Original: creates a tuple object of the type defined by the argument types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数テンプレート)
tie	左辺値参照またはアンパックのtupleは、個々のオブジェクトにタプルが作成されます Original: creates a tuple of lvalue references or unpacks a tuple into individual objects The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数テンプレート)
tuple_cat	タプルの任意の番号を連結することによってtupleを作成します Original: creates a tuple by concatenating any number of tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数テンプレート)