< cpp‎ | experimental‎ | simd‎ | simd mask
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reference operator[]( size_t i );
(1) (parallelism TS v2)
bool operator[]( size_t i ) const;
(2) (parallelism TS v2)

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

1) Returns a reference proxy to the i-th element. This proxy type should not be captured into an lvalue. Lvalues of simd_mask::reference can only convert to value_type. Rvalues of simd_mask::reference overload assignment and all compound assignment operators as well as swap.
2) Returns a prvalue of the i-th element. In contrast to containers, which contain objects of type value_type, a simd_mask is not a container of individual objects and therefore cannot return an lvalue-reference.

[edit] Parameters

i - the element index. Required to be less than size()

[edit] Example

#include <cstddef>
#include <experimental/simd>
#include <iostream>
namespace stdx = std::experimental;
int main()
    stdx::native_simd_mask<int> a{true};
    a[1] = 0;
    for (std::size_t i = 0; i != a.size(); ++i)
        std::cout << a[i] << ' ';
    std::cout << '\n';

Possible output:

1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1