[simd.subscr]

# 29 Numerics library [[numerics]](./#numerics)

## 29.10 Data-parallel types [[simd]](simd#subscr)

### 29.10.7 Class template basic_vec [[simd.class]](simd.class#simd.subscr)

#### 29.10.7.3 basic_vec subscript operator [simd.subscr]

[🔗](#lib:operator%5b%5d,basic_vec)

`constexpr value_type operator[](simd-size-type i) const;
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L17903)

*Preconditions*: i >= 0 && i < size() is true[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L17907)

*Returns*: The value of the ith element[.](#2.sentence-1)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L17911)

*Throws*: Nothing[.](#3.sentence-1)

[🔗](#lib:operator%5b%5d,basic_vec_)

`template<[simd-integral](simd.expos#concept:simd-integral "29.10.2 Exposition-only types, variables, and concepts [simd.expos]") I>
  constexpr resize_t<I::size(), basic_vec> operator[](const I& indices) const;
`

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/numerics.tex#L17923)

*Effects*: Equivalent to: return permute(*this, indices);