Extensions for parallelism, version 2

The C++ Extensions for Parallelism Version 2, ISO/IEC TS 19570:2018 defines the following new components for the C++ standard library:

Parallel exceptions

Defined in header <experimental/exception_list>
exception_list	exceptions raised during parallel executions (class)

Execution policies

Defined in header <experimental/execution_policy>
unsequenced_policy vector_policy	execution policy types (class)
unseq vec	global execution policy objects (constant)

Parallel algorithms

This section is incomplete

Task Block

This section is incomplete

Data-Parallel Types

simd (parallelism TS v2)	data-parallel vector type (class template)
simd_mask (parallelism TS v2)	data-parallel type with the element type bool (class template)

Feature test macros

Defined in header <experimental/task_block>
__cpp_lib_experimental_parallel_task_block	a value of at least 201711 indicates that the task block functionality is supported (macro constant)
Defined in header <experimental/execution>
__cpp_lib_experimental_execution_vector_policy	a value of at least 201711 indicates that the vector and wavefront policies are supported (macro constant)
Defined in header <experimental/algorithm>
__cpp_lib_experimental_parallel_for_loop	a value of at least 201711 indicates that the for_loop class of algorithms is supported (macro constant)
Defined in header <experimental/simd>
__cpp_lib_experimental_parallel_simd	a value of at least 201803 indicates that the data-parallel types library is supported (macro constant)