std::experimental::simd<T,Abi>::operator[]

< cpp‎ | experimental‎ | simd‎ | simd

reference operator[]( std::size_t i );	(1)	(并行 TS v2)
value_type operator[]( std::size_t i ) const;	(2)	(并行 TS v2)

The subscript operators allow reading and writing single elements of a simd.

1) Returns a reference proxy to the i-th element. This proxy type should not be captured into an lvalue. Lvalues of simd::reference can only convert to value_type. Rvalues of simd::reference overload assignment and all compound assignment operators as well as swap.

2) 返回第 i 个元素的纯右值。In contrast to containers, which contain objects of type value_type, a simd is not a container of individual objects and therefore cannot return an lvalue-reference.

参数

元素索引。要求其小于 size()

示例

#include <cstddef>
#include <cstdint>
#include <experimental/simd>
#include <iostream>
namespace stdx = std::experimental;
 
int main()
{
    const stdx::native_simd<std::int64_t> a = 3;
    for (std::size_t i = 0; i != a.size(); ++i)
        std::cout << a[i] << ' ';
    std::cout << '\n';
}

可能的输出：

3 3 3 3 3 3 3 3