std::get(std::pair)

 

C++

語言

概念

實用工具庫

字元串庫

集裝箱庫

演算法庫

迭代器庫

Numerics庫

輸入/輸出庫

本地化庫

正則表達式庫 （C++11）

原子操作庫 （C++11）

線程的支持庫 （C++11）

 

實用工具庫

類型的支持 (basic types, RTTI, type traits)

動態內存管理

錯誤處理

程序實用工具

可變參數函數

日期和時間

函數對象

initializer_list （C++11）

bitset

hash （C++11）

關係運算符 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>=

雙和元組 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）

掉期，遠期和移動 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::pair

成員函數 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.

pair::pair

pair::operator=

pair::swap

非成員函數 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_pair

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

std::swap

get （C++11）

Helper類 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 （C++11）

tuple_element （C++11）

 

template< size_t N, class T1, class T2 > typename std::tuple_element<I, std::pair<T1,T2> >::type&     get( pair<T1, T2>& p );	(1)	（C++11 起）
template< size_t N, class T1, class T2 > const typename std::tuple_element<I, std::pair<T1,T2> >::type&     get( const pair<T1,T2>& p );	(2)	（C++11 起）
template< size_t N, class T1, class T2 > typename std::tuple_element<I, std::pair<T1,T2> >::type&&     get( std::pair<T1,T2>&& p );	(3)	（C++11 起）

提取一個元素的元組介面對使用.

Original:

Extracts a element from the pair using tuple-like interface.

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

參數

p

-

對提取其內容 Original: pair whose contents to extract The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

返回值

1-2)

返回p.firstN==0p.second如果N==1.

Original:

Returns p.first if N==0 and p.second if N==1.

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

3)

如果std::forward<T1&&>(p.first)返回N==0和std::forward<T2&&>(p.second)如果N==1

Original:

Returns std::forward<T1&&>(p.first) if N==0 and std::forward<T2&&>(p.second) if N==1

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

例外

1-3)

noexcept specification:  

noexcept

  （C++11 起）

為例

#include <iostream>
#include <utility>
 
int main()
{
    auto p = std::make_pair(1, 3.14);
    std::cout << '(' << std::get<0>(p) << ", " << std::get<1>(p) << ')' << std::endl;
}

Output:

(1, 3.14)

另請參閱

std::get(std::tuple)	tuple訪問指定的元素 Original: tuple accesses specified element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函數模板）
std::get(std::array)	accesses an element of an array （函數模板）