std::experimental::is_simd, std::experimental::is_simd_mask
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< cpp | experimental | simd
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Defined in header
<experimental/simd>
template< class T >
struct is_simd;
(1)
(parallelism TS v2)
struct is_simd;
template< class T >
struct is_simd_mask;
(2)
(parallelism TS v2)
struct is_simd_mask;
1) If
T is a specialization of the simd class template, provides the member constant value equal true. For any other type, value is false.2) If
T is a specialization of the simd_mask class template, provides the member constant value equal true. For any other type, value is false.Contents
[edit] Template parameters
T
-
a type to check
[edit] Helper variable template
template< class T >
constexpr bool is_simd_v = is_simd<T>::value;
(parallelism TS v2)
constexpr bool is_simd_v = is_simd<T>::value;
template< class T >
constexpr bool is_simd_mask_v = is_simd_mask<T>::value;
(parallelism TS v2)
constexpr bool is_simd_mask_v = is_simd_mask<T>::value;
Inherited from std::integral_constant
Member constants
Member functions
operator bool
(public member function)
operator()
(C++14)
(public member function)
Member types
Type
Definition
value_type
bool
type
std::integral_constant <bool, value>
[edit] Notes
is_simd_v<T> is necessary but not sufficient for testing whether T can be used as a SIMD type. For example, is_simd_v<simd<bool>> is true, even though bool is not included in the permissible vectorizable types. The missing condition is std::is_constructible_v <T>, which is false for simd<bool>.
[edit] Example
Run this code
#include <experimental/simd> #include <iostream> #include <string_view> namespace stdx = std::experimental; template<typename T> void test_simd(std::string_view type_name) { std::cout << std::boolalpha << "Type: " << type_name << '\n' << " is_simd: " << stdx::is_simd_v<T> << '\n' << " is_constructible: " << std::is_constructible_v <T> << '\n'; } template<typename T> void test_simd_mask(std::string_view type_name) { std::cout << std::boolalpha << "Type: " << type_name << '\n' << " is_simd_mask: " << stdx::is_simd_mask_v<T> << '\n' << " is_constructible: " << std::is_constructible_v <T> << "\n\n"; } int main() { test_simd<int>("int"); test_simd_mask<int>("int"); test_simd<stdx::simd<float>>("simd<float>"); test_simd_mask<stdx::simd_mask<float>>("simd_mask<float>"); test_simd<stdx::simd<bool>>("simd<bool>"); test_simd_mask<stdx::simd_mask<bool>>("simd_mask<bool>"); }
Output:
Type: int is_simd: false is_constructible: true Type: int is_simd_mask: false is_constructible: true Type: simd<float> is_simd: true is_constructible: true Type: simd_mask<float> is_simd_mask: true is_constructible: true Type: simd<bool> is_simd: true is_constructible: false Type: simd_mask<bool> is_simd_mask: true is_constructible: false