std::is_execution_policy

Defined in header `<execution>`
template< class T > struct is_execution_policy;		(since C++17)

Checks whether T is a standard or implementation-defined execution policy type.

Provides the member constant value which is equal to true, if T is a standard execution policy type, or an implementation-defined execution policy type. Otherwise, value is equal to false.

If the program adds specializations for std::is_execution_policy or std::is_execution_policy_v, the behavior is undefined.

Template parameters

a type to check

Helper template

Defined in header `<execution>`
template< class T > constexpr bool is_execution_policy_v = std::is_execution_policy<T>::value;		(since C++17)

Inherited from std::integral_constant

Member constants

value

[static]

true if T is a standard or implementation-defined execution policy type, false otherwise
(public static member constant)

Member functions

operator bool	converts the object to bool, returns `value` (public member function)
operator() (C++14)	returns `value` (public member function)

Member types

Type	Definition
`value_type`	bool
`type`	std::integral_constant<bool,value>

#include <execution>

static_assert(std::is_execution_policy_v<std::execution::unsequenced_policy>);
static_assert(!std::is_execution_policy_v<int>);

int main() {}

sequenced_policyparallel_policyparallel_unsequenced_policyunsequenced_policy (C++17)(C++17)(C++17)(C++20)	execution policy types (class)
seqparpar_unsequnseq (C++17)(C++17)(C++17)(C++20)	global execution policy objects (constant)