rocThrust migration to CCCL 3.0.3

Changes have been made to rocThrust to achieve parity with CCCL 3.0.3, establish a hard dependency on libhipcxx, and align with the changes made in Thrust.

Changes to platform support

rocThrust now requires:

• C++17 or later

• Clang version 14 or later

• GCC version 7 or later

• Visual Studio 2019 or later on Windows

CUDA Dynamic Parallelism V1 (CDPv1) and Intel ICC (icpx) are no longer supported.

Changes to iterator traits

A new standard type traits system is now provided by libhipcxx and libcudacxx.

hip::std::iterator_traits uses the new system and should be preferred over thrust::iterator_traits.

thrust::iterator_traits can no longer be specialized.

Removed macros

Macro	Migration guidance
CUDA_CUB_RET_IF_FAIL	No replacement.
THRUST_CLANG_VERSION	No replacement.
THRUST_DECLTYPE_RETURNS_WITH_SFINAE_CONDITION	No replacement.
THRUST_DEVICE_CODE	No replacement.
THRUST_DEVICE_COMPILER*	No replacement.
THRUST_GCC_VERSION	No replacement.
THRUST_HOST_BACKEND	Use THRUST_HOST_SYSTEM instead.
THRUST_HOST_COMPILER*	No replacement.
THRUST_INCLUDE_DEVICE_CODE	No replacement.
THRUST_INCLUDE_HOST_CODE	No replacement.
THRUST_INLINE_CONSTANT	Use inline constexpr instead.
THRUST_INLINE_INTEGRAL_MEMBER_CONSTANT	Use static constexpr instead.
THRUST_IS_DEVICE_CODE	No replacement.
THRUST_IS_HOST_CODE	No replacement.
THRUST_LEGACY_GCC	No replacement.
THRUST_MODERN_GCC	No replacement.
THRUST_MODERN_GCC_REQUIRED_NO_ERROR	No replacement.
THRUST_MSVC_VERSION	No replacement.
THRUST_MSVC_VERSION_FULL	No replacement.
THRUST_MVCAP	No replacement.
THRUST_NODISCARD	Use [[nodiscard]] instead.
THRUST_RETOF	No replacement.
THRUST_RETOF1	No replacement.
THRUST_RETOF2	No replacement.
THRUST_STATIC_ASSERT(expr)	Use static_assert(expr) instead.
THRUST_TUNING_ARCH	No direct replacement. Use compiler-specific __CUDA_ARCH__ (nvcc) or __NVCOMPILER_CUDA_ARCH__ (nvc++) instead.
THRUST_CDP_DISPATCH	No replacement. Support for CUDA Dynamic Parallelism V1 (CDPv1) has been removed.

Removed functions and classes

API	Migration guidance
_ReadWriteBarrier and __thrust_compiler_fence	Use hip::atomic instead.
thrust::async::*	No replacement. To make a thrust algorithm skip syncing, use thrust::hip::par_nosync as the execution policy.
thrust::*::[first_argument_type|second_argument_type|result_type]	No replacement. The nested aliases have been removed for all function object types. Affected types: thrust::plus, thrust::minus, thrust::multiplies, thrust::divides, thrust::modulus, thrust::negate, thrust::square, thrust::equal_to, thrust::not_equal_to, thrust::greater, thrust::less, thrust::greater_equal, thrust::less_equal, thrust::logical_and, thrust::logical_or, thrust::logical_not, thrust::bit_and, thrust::bit_or, thrust::bit_xor, thrust::identity, thrust::maximum, thrust::minimum, thrust::project1st, thrust::project2nd
thrust::[binary|unary]_function	No replacement. Remove any base classes that inherit from these types.
thrust::[binary|unary]_traits	No replacement.
thrust::bidirectional_universal_iterator_tag	No replacement.
thrust::conjunction_value<Ts...>	Use hip::std::bool_constant<(Ts && ...)> instead.
thrust::conjunction_value_v<Ts...>	Use a fold expression: Ts && ... instead.
thrust::cuda_cub::core::*	Implementation detail. No public exposure is provided.
thrust::[cuda_cub|hip_rocprim]::counting_iterator_t	Use thrust::counting_iterator instead.
thrust::[cuda_cub|hip_rocprim]::identity	Use hip::std::identity instead.
thrust::cuda_cub::launcher::triple_chevron	No replacement.
thrust::[cuda_cub|hip_rocprim]::terminate	Use hip::std::terminate() instead.
thrust::[cuda_cub|hip_rocprim]::transform_input_iterator_t	Use thrust::transform_iterator instead.
thrust::[cuda_cub|hip_rocprim]::transform_pair_of_input_iterators_t	Use thrust::transform_iterator of a thrust::zip_iterator instead.
thrust::disjunction_value<Ts...>	Use hip::std::bool_constant<(Ts || ...)> instead.
thrust::disjunction_value_v<Ts...>	Use a fold expression: Ts || ... instead.
thrust::forward_universal_iterator_tag	No replacement.
thrust::identity<T>	Use hip::std::identity instead. If thrust::identity was used to perform a cast to T, define a custom function object.
thrust::input_universal_iterator_tag	No replacement.
thrust::negation_value<T>	Use hip::std::bool_constant<!T> instead.
thrust::negation_value_v<T>	Use a plain negation !T.
thrust::not[1|2]	Use hip::std::not_fn instead.
thrust::null_type	No replacement.
thrust::numeric_limits<T>	Use hip::std::numeric_limits<T> instead.
thrust::optional<T>	Use hip::std::optional<T> instead.
thrust::output_universal_iterator_tag	No replacement.
thrust::random_access_universal_iterator_tag	No replacement.
thrust::remove_cvref{_t}	Use hip::std::remove_cvref{_t} instead.
thrust::void_t	Use hip::std::void_t instead.

Deprecations with planned removal

API	Migration guidance
THRUST_UNUSED_VAR	No replacement.
thrust::iterator_difference{_t}<T>	Use hip::std::iterator_traits<T>::difference_type or hip::std::iter_difference_t<T> instead.
thrust::iterator_pointer{_t}<T>	Use hip::std::iterator_traits<T>::pointer instead.
thrust::iterator_reference{_t}<T>	Use hip::std::iterator_traits<T>::reference or hip::std::iter_reference_t<T> instead.
thrust::iterator_traits<T>	Use hip::std::iterator_traits<T> instead.
thrust::iterator_value{_t}<T>	Use hip::std::iterator_traits<T>::value_type or hip::std::iter_value_t<T> instead.

Aliased functions

The following Thrust function object types have been made aliases to the equally-named types in hip::std. No change is needed if you are using these in your code.

• thrust::plus

• thrust::minus

• thrust::multiplies

• thrust::divides

• thrust::modulus

• thrust::negate

• thrust::equal_to

• thrust::not_equal_to

• thrust::greater

• thrust::less

• thrust::greater_equal

• thrust::less_equal

• thrust::logical_and

• thrust::logical_or

• thrust::logical_not

• thrust::bit_and

• thrust::bit_or

• thrust::bit_xor

• thrust::identity

• thrust::maximum

• thrust::minimum

Other API changes

API	Change
thrust::tabulate_output_iterator	The value_type has been changed to void.
thrust::pair	Converted to an alias for hip::std::pair and no longer a distinct type.
thrust::tuple	Converted to an alias for hip::std::tuple and no longer a distinct type.
thrust::transform_iterator	Copying this iterator will now always copy its contained function. If the contained function is neither copy constructible nor copy assignable, compilation will fail when an attempt is made to copy the iterator.
thrust::universal_host_pinned_memory_resource	The alias has changed to a different memory resource, potentially changing pointer types derived from an allocator or container using this memory resource.