29 Numerics library [numerics]

29.10 Data-parallel types [simd]

29.10.9 Non-member operations [simd.mask.nonmembers]

29.10.9.4 basic_simd_mask exposition only conditional operators [simd.mask.cond]

friend constexpr basic_simd_mask simd-select-impl(
  const basic_simd_mask& mask, const basic_simd_mask& a, const basic_simd_mask& b) noexcept;

Returns: A basic_simd_mask object where the

i^{th}

element equals mask[i] ? a[i] : b[i] for all i in the range of [0, size()).

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friend constexpr basic_simd_mask
simd-select-impl(const basic_simd_mask& mask, same_as<bool> auto a, same_as<bool> auto b) noexcept;

Returns: A basic_simd_mask object where the

i^{th}

element equals mask[i] ? a : b for all i in the range of [0, size()).

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template<class T0, class T1>
  friend constexpr simd<see below, size()>
    simd-select-impl(const basic_simd_mask& mask, const T0& a, const T1& b) noexcept;

Constraints:

(3.1)
same_as<T0, T1> is true,
(3.2)
T0 is a vectorizable type, and
(3.3)
sizeof(T0) == Bytes.

Returns: A simd<T0, size()> object where the

i^{th}

element equals mask[i] ? a : b for all i in the range of [0, size()).