[simd.mask.cond]

Returns: A basic_mask object where the

{i th element equals mask [i] ? a [i] : b [i] for all i in the range of [0, size ()) .}^{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_mask
simd-select-impl(const basic_mask& mask, same_as<bool> auto a, same_as<bool> auto b) noexcept;

Returns: A basic_mask object where the

{i th element equals mask [i] ? a : b for all i in the range of [0, size ()) .}^{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 vec<see below, size()>
    simd-select-impl(const basic_mask& mask, const T0& a, const T1& b) noexcept;

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

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

29 Numerics library [numerics]

29.10 Data-parallel types [simd]

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

29.10.10.4 Exposition-only conditional operators [simd.mask.cond]