std::is_execution_policy
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C++
Feature test macros (C++20)
Concepts library (C++20)
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Execution control library (C++26)
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Constrained algorithms, e.g. ranges::copy, ranges::sort, ...
is_execution_policy
(C++17)
(C++17) (C++17)(C++17)(C++20)
(C++17)
(C++11)
(until C++17)(C++11)
(C++20)(C++20)
(C++17)
(C++17)
(C++17)
(C++17)
Defined in header
<execution>
template< class T >
struct is_execution_policy;
(since C++17)
struct is_execution_policy;
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.
Contents
[edit] Template parameters
T
-
a type to check
[edit] Helper template
Defined in header
<execution>
template< class T >
constexpr bool is_execution_policy_v = std::is_execution_policy<T>::value;
(since C++17)
constexpr bool is_execution_policy_v = std::is_execution_policy<T>::value;
Inherited from std::integral_constant
Member constants
value
[static]
T is a standard or implementation-defined execution policy type, false otherwise (public static member constant)
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>
Run this code
#include <execution> static_assert(std::is_execution_policy_v<std::execution::unsequenced_policy >); static_assert(!std::is_execution_policy_v<int>); int main() {}