Changes

update mdspan tpl

CTAD (deduction guides) for RangePolicy (#6850)

* Removed the check for NVCC compiler version when testing CTAD,
as decltype(RangePolicy(...)) isn't compiling under any version
of Cuda.

* Added in the explicit deduction guides for RangePolicy:
• Correctness when passing in an execution space
• Workaround for nvcc as RangePolicy<...> doesn't have any
template parameters that can be deduced, so gcc/clang assume that a
matching ctor in the primary template deduces to RangePolicy<> while
nvcc assumes it is a bug.

Rewrote the tests to be of the form:

[[maybe_unused]] static inline auto rpxy = RangePolicy(x, y);
static_assert(is_same_v<RangePolicy<WhatShouldBeHere>, decltype(rpxy)>);

This form avoids the most vexing parse.o, and seems to pass on all
compilers.

Added tests for SomeExecutionSpace which is guaranteed not to be
DefaultExecutionSpace.

Added calls to ImplicitlyConvertibleToDefaultExecutionSpace::operator
DefaultExecutionSpace() and SomeExecutionSpace::concurrency() to
avoid maybe_unused errors under some compilers.

Notes:

The default constructed CTAD RangePolicy uses list initialization syntax
(curlies) instead of parentheses to get around a gcc 8.2 compiler bug.

nestodes uses "Kokkos::DefaultExecutionSpace" instead of "auto" in order
to trigger the implicit conversion.

Export ROCTHRUST as a Kokkos dependency

update mdspan tpl

CTAD (deduction guides) for RangePolicy (#6850)

* Removed the check for NVCC compiler version when testing CTAD,
as decltype(RangePolicy(...)) isn't compiling under any version
of Cuda.

* Added in the explicit deduction guides for RangePolicy:
• Correctness when passing in an execution space
• Workaround for nvcc as RangePolicy<...> doesn't have any
template parameters that can be deduced, so gcc/clang assume that a
matching ctor in the primary template deduces to RangePolicy<> while
nvcc assumes it is a bug.

Rewrote the tests to be of the form:

[[maybe_unused]] static inline auto rpxy = RangePolicy(x, y);
static_assert(is_same_v<RangePolicy<WhatShouldBeHere>, decltype(rpxy)>);

This form avoids the most vexing parse.o, and seems to pass on all
compilers.

Added tests for SomeExecutionSpace which is guaranteed not to be
DefaultExecutionSpace.

Added calls to ImplicitlyConvertibleToDefaultExecutionSpace::operator
DefaultExecutionSpace() and SomeExecutionSpace::concurrency() to
avoid maybe_unused errors under some compilers.

Notes:

The default constructed CTAD RangePolicy uses list initialization syntax
(curlies) instead of parentheses to get around a gcc 8.2 compiler bug.

nestodes uses "Kokkos::DefaultExecutionSpace" instead of "auto" in order
to trigger the implicit conversion.

Export ROCTHRUST as a Kokkos dependency

update mdspan tpl

CTAD (deduction guides) for RangePolicy (#6850)

* Removed the check for NVCC compiler version when testing CTAD,
as decltype(RangePolicy(...)) isn't compiling under any version
of Cuda.

* Added in the explicit deduction guides for RangePolicy:
• Correctness when passing in an execution space
• Workaround for nvcc as RangePolicy<...> doesn't have any
template parameters that can be deduced, so gcc/clang assume that a
matching ctor in the primary template deduces to RangePolicy<> while
nvcc assumes it is a bug.

Rewrote the tests to be of the form:

[[maybe_unused]] static inline auto rpxy = RangePolicy(x, y);
static_assert(is_same_v<RangePolicy<WhatShouldBeHere>, decltype(rpxy)>);

This form avoids the most vexing parse.o, and seems to pass on all
compilers.

Added tests for SomeExecutionSpace which is guaranteed not to be
DefaultExecutionSpace.

Added calls to ImplicitlyConvertibleToDefaultExecutionSpace::operator
DefaultExecutionSpace() and SomeExecutionSpace::concurrency() to
avoid maybe_unused errors under some compilers.

Notes:

The default constructed CTAD RangePolicy uses list initialization syntax
(curlies) instead of parentheses to get around a gcc 8.2 compiler bug.

nestodes uses "Kokkos::DefaultExecutionSpace" instead of "auto" in order
to trigger the implicit conversion.

Export ROCTHRUST as a Kokkos dependency