29 Numerics library [numerics]

29.10 Data-parallel types [simd]

29.10.10 basic_mask non-member operations [simd.mask.nonmembers]

29.10.10.2 Compound assignment [simd.mask.cassign]

friend constexpr basic_mask&
  operator&=(basic_mask& lhs, const basic_mask& rhs) noexcept;
friend constexpr basic_mask&
  operator|=(basic_mask& lhs, const basic_mask& rhs) noexcept;
friend constexpr basic_mask&
  operator^=(basic_mask& lhs, const basic_mask& rhs) noexcept;

Let op be the operator.

Effects: These operators apply op to lhs and rhs as a binary element-wise operation.

Returns: lhs.