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std::experi..._abi::deduce(3) C++ Standard Libarystd::experi..._abi::deduce(3) NAME std::experimental::simd_abi::deduce - std::experimental::simd_abi::de- duce Synopsis Defined in header <experimental/simd> template< class T, std::size_t N, class ...Abis > (parallelism TS v2) struct deduce; The type deduce<T, N, Abis...>::type is present if and only if: * T is a vectorizable type, * simd_abi::fixed_size<N> is supported, and * every type in Abis... is an ABI tag. Let DA denote deduce<T, N, Abis...>::type when it presents, then * simd_size_v<T, DA> == N, * simd<T, DA> is default constructible, i.e. it is supported, * DA is simd_abi::scalar if N == 1, otherwise it is implementa- tion-defined. Member types Name Definition type an ABI tag type suitable for specified element type T and size N Helper types template< class T, std::size_t N, class ...Abis > (parallelism TS v2) using deduce_t = typename deduce<T, N, Abis...>::type; Notes simd_abi::deduce is SFINAE-friendly. The ABI tag deduced via this facility is a Quality-of-Implementation feature. Implementations can base the choice on Abis..., but can also ignore the Abis... arguments. A simple implementation might simply return fixed_size<N> unconditionally. An optimized implementation might return an imple- mentation-defined extended ABI tag for most inputs. Consequently, if you need an ABI tag for a certain number of elements, use fixed_size if ABI stability is of concern, and prefer deduce_t otherwise. Example This section is incomplete Reason: no example See also scalar tag type for storing a single element (parallelism TS v2) (typedef) fixed_size tag type for storing specified number of ele- ments (parallelism TS v2) (alias template) compatible tag type that ensures ABI compatibility (parallelism TS v2) (alias template) native tag type that is most efficient (parallelism TS v2) (alias template) Category: * Todo no example http://cppreference.com 2024.06.10 std::experi..._abi::deduce(3)
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