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std::experi..._abi::deduce(3)  C++ Standard Libary std::experi..._abi::deduce(3)

NAME
     std::experimental::simd_abi::deduce - std::experimental::simd_abi::deduce

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 implementation-de-
     fined.

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 implementa-
     tion-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 elements
	(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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