std::get(std::array)

 

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std::array

成员函数 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.

元素的访问 Original: Element access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

array::at

array::operator[]

array::front

array::back

array::data

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

array::begin array::cbegin

array::end array::cend

array::rbegin array::crbegin

array::rend array::crend

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

array::empty

array::size

array::max_size

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

array::fill

array::swap

非成员函数 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.

get

swap

Helper类 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

 

template<size_t I, class T, size_t N > T& get( array<T,N>& a );	(1)	（C++11 起）
template<size_t I, class T, size_t N > T&& get( array<T,N>&& a );	(2)	（C++11 起）
template<size_t I, class T, size_t N > const T& get( const array<T,N>& a );	(3)	（C++11 起）

从数组中提取Ithelement元素.

Original:

Extracts the Ith element element from the array.

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I[0, N)范围内的值必须是一个整数。这是在编译时执行，而不是at()或operator[]().

Original:

I must be an integer value in range [0, N). This is enforced at compile time as opposed to at() or operator[]().

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参数

a

-

数组，其内容提取 Original: array 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)

参考Ith元素a.

Original:

Reference to the Ith element of a.

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2)

rvalue引用Ith的a元素，除非该元素是左值引用类型，在这种情况下，左值引用被返回.

Original:

Rvalue reference to the Ith element of a, unless the element is of lvalue reference type, in which case lvalue reference is returned.

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3)

const引用的Ith元素a.

Original:

Const reference to the Ith element of a.

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例外

noexcept specification:  

noexcept

  （C++11 起）

为例

#include <iostream>
#include <array>
 
int main()
{
    std::array<int, 3> arr;
 
    // set values:
    std::get<0>(arr) = 1;
    std::get<1>(arr) = 2;
    std::get<2>(arr) = 3;
 
    // get values:
    std::cout << "(" << std::get<0>(arr) << ", " << std::get<1>(arr)
              << ", " << std::get<2>(arr) << ")\n";
}

Output:

(1, 2, 3)

另请参阅

operator[]	访问指定的元素 Original: access specified element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （公共成员函数）
at	访问指定的元素与边界检查 Original: access specified element with bounds checking The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （公共成员函数）
std::get(std::tuple)	tuple访问指定的元素 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. （函数模板）
std::get(std::pair) （C++11）	访问一个一个pair元素 Original: accesses an element of a pair The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）