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implement allocator concept #1750

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Merged
ericniebler merged 6 commits into from
Jan 13, 2026
Merged

implement allocator concept #1750

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83bc2c2
implement allocator concept
Cra3z Jan 11, 2026
c27823a
use the `stdexec::` versions of the concepts
ericniebler Jan 11, 2026
8d09a47
fix `allocate` constraint in `__allocator` concept, clang-format
ericniebler Jan 11, 2026
cd5fb3b
trying to molify msvc
ericniebler Jan 12, 2026
4a5002a
rename `__allocator` to `__allocator_`
Cra3z Jan 13, 2026
ca75ba1
Merge branch 'main' into main
Cra3z Jan 13, 2026
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19 changes: 19 additions & 0 deletions include/stdexec/__detail/__concepts.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -271,4 +271,23 @@ namespace STDEXEC {
template <class _Ty, class... _Us>
requires __none_of<_Ty, _Us...>
using __unless_one_of_t = _Ty;

namespace __detail {
template <class _Alloc>
auto __test_alloc_pointer(int) -> typename _Alloc::pointer;
template <class _Alloc>
auto __test_alloc_pointer(long) -> typename _Alloc::value_type*;

template <class _Alloc>
using __alloc_pointer_t = decltype(__detail::__test_alloc_pointer<__decay_t<_Alloc>>(0));
} // namespace __detail

template <class _Alloc>
concept __allocator_ = //
requires(__decay_t<_Alloc>& __alloc, std::size_t __bytes) {
{ __alloc.allocate(__bytes) } -> same_as<__detail::__alloc_pointer_t<_Alloc>>;
__alloc.deallocate(__alloc.allocate(__bytes), __bytes);
} //
&& copy_constructible<__decay_t<_Alloc>> //
&& equality_comparable<__decay_t<_Alloc>>;
} // namespace STDEXEC
6 changes: 1 addition & 5 deletions include/stdexec/__detail/__queries.hpp
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Expand Up @@ -27,10 +27,6 @@ namespace STDEXEC {
//////////////////////////////////////////////////////////////////////////////////////////////////
// [exec.queries]
namespace __queries {
// TODO: implement allocator concept
template <class _T0>
concept __allocator_c = true;

//////////////////////////////////////////////////////////////////////////////////
// [exec.get.allocator]
struct get_allocator_t : __query<get_allocator_t> {
Expand All @@ -44,7 +40,7 @@ namespace STDEXEC {
STDEXEC_ATTRIBUTE(always_inline, host, device)
static constexpr void __validate() noexcept {
static_assert(__nothrow_callable<get_allocator_t, const _Env&>);
static_assert(__allocator_c<__call_result_t<get_allocator_t, const _Env&>>);
static_assert(__allocator_<__call_result_t<get_allocator_t, const _Env&>>);
}

STDEXEC_ATTRIBUTE(nodiscard, always_inline, host, device)
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