# Extensions for parallelism, version 2

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< cpp‎ | experimental

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)

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