29 Numerics library [numerics]

29.10 Data-parallel types [simd]

29.10.9 Class template basic_mask [simd.mask.class]

29.10.9.2 Constructors [simd.mask.ctor]

constexpr explicit basic_mask(same_as<value_type> auto) noexcept;

Effects: Initializes each element with x.

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template<size_t UBytes, class UAbi>
  constexpr explicit basic_mask(const basic_mask<UBytes, UAbi>& x) noexcept;

Constraints: basic_mask<UBytes, UAbi>::size() == size() is true.

Effects: Initializes the

i^{th}

element with x[i] for all i in the range of [0, size()).

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template<class G> constexpr explicit basic_mask(G&& gen);

Constraints: The expression gen(integral_constant<simd-size-type, i>()) is well-formed and its type is bool for all i in the range of [0, size()).

Effects: Initializes the

i^{th}

element with gen(integral_constant<simd-size-type, i>()) for all i in the range of [0, size()).

Remarks: gen is invoked exactly once for each i, in increasing order of i.

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template<same_as<bitset<size()>> T>
  constexpr basic_mask(const T& b) noexcept;

Effects: Initializes the

i^{th}

element with b[i] for all i in the range [0, size()).

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template<unsigned_integral T>
  requires (!same_as<T, value_type>)
  constexpr explicit basic_mask(T val) noexcept;

Effects: Initializes the first M elements to the corresponding bit values in val, where M is the smaller of size() and the number of bits in the value representation ([basic.types.general]) of the type of val.

If M is less than size(), the remaining elements are initialized to zero.