std::experimental::where

 

C++

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Freestanding and hosted

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Feature test macros (C++20)

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Concepts library (C++20)

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Technical specifications

Symbols index

External libraries

 

Experimental

Technical Specification

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals TS v2)

Library fundamentals 3 (library fundamentals TS v3)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Extensions for concurrency 2 (concurrency TS v2)

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Reflection (reflection TS)

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Experimental Non-TS

Pattern Matching

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std::execution

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2D Graphics

 

Extensions for parallelism v2

Parallel exceptions
exception_list
Additional execution policies
execution::vector_policy	execution::unsequenced_policy
Algorithms
induction reductionreduction_plusreduction_minusreduction_multiplies	reduction_bit_andreduction_bit_orreduction_bit_xorreduction_minreduction_max	for_loopfor_loop_stridedfor_loop_nfor_loop_n_strided
execution::no_vec
execution::ordered_update_t
Task blocks
task_block
task_cancelled_exception
define_task_blockdefine_task_block_restore_thread
Data-parallel vectors

 

SIMD library

Main classes
simd	simd_mask
ABI tags
simd_abi::scalar simd_abi::fixed_size	simd_abi::native simd_abi::compatible	simd_abi::max_fixed_size simd_abi::deduce
Alignment tags
element_aligned_tagelement_aligned	vector_aligned_tagvector_aligned	overaligned_tagoveraligned
Where expression
where	where_expression	const_where_expression
Casts
simd_caststatic_simd_cast	to_fixed_sizeto_compatibleto_native	splitsplit_by concat
Algorithms
min max	minmax clamp
Reduction
reducehminhmax
Mask reduction
all_ofany_ofnone_ofsome_of	popcount find_first_setfind_last_set
Traits
is_simdis_simd_mask is_abi_tag is_simd_flag_type	simd_size memory_alignment rebind_simdresize_simd
Math functions

 

Defined in header <experimental/simd>
template< class T, class Abi > where_expression<simd_mask<T, Abi>, simd<T, Abi>> where( const typename simd<T, Abi>::mask_type& mask,        simd<T, Abi>& value) noexcept;	(1)	(parallelism TS v2)
template< class T, class Abi > const_where_expression<simd_mask<T, Abi>, const simd<T, Abi>> where( const typename simd<T, Abi>::mask_type& mask,        const simd<T, Abi>& value) noexcept;	(2)	(parallelism TS v2)
template< class T, class Abi > where_expression<simd_mask<T, Abi>, simd_mask<T, Abi>> where( const nodeduce_t<simd_mask<T, Abi>>& mask,        simd_mask<T, Abi>& value) noexcept;	(3)	(parallelism TS v2)
template< class T, class Abi > const_where_expression<simd_mask<T, Abi>, const simd_mask<T, Abi>> where( const nodeduce_t<simd_mask<T, Abi>>& mask,        const simd_mask<T, Abi>& value) noexcept;	(4)	(parallelism TS v2)
template< class T > where_expression<bool, T> where( /*see below*/ mask, T& value ) noexcept;	(5)	(parallelism TS v2)
template< class T > const_where_expression<bool, const T> where( /*see below*/ mask, const T& value ) noexcept;	(6)	(parallelism TS v2)

Constructs a new const_where_expression or where_expression.

1-6) constructs a where_expression from given mask and value parameters.

Parameters

1-4)

mask	-	the simd_mask object
value	-	reference to the simd object that mask applies on

5-6)

mask	-	the mask of type bool
value	-	reference to the scalar that mask applies on

Return value

The constructed const_where_expression or where_expression.

Notes

5-6) uses implementation defined type of mask, so that implicit conversions from other types to bool is disabled.