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drop support for legacy ways to opt in to sender and receiver concepts #1871

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Merged
ericniebler merged 1 commit into from
Feb 20, 2026
Merged

drop support for legacy ways to opt in to sender and receiver concepts #1871

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9 changes: 2 additions & 7 deletions include/stdexec/__detail/__receivers.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -167,16 +167,11 @@ namespace STDEXEC {
(STDEXEC_PP_WHEN(
STDEXEC_EDG(),
requires { typename _Receiver::receiver_concept; } &&)
__std::derived_from<typename _Receiver::receiver_concept, receiver_t>)
|| requires { typename _Receiver::is_receiver; } // back-compat, NOT TO SPEC
|| STDEXEC_IS_BASE_OF(receiver_t, _Receiver); // NOT TO SPEC, for receiver_adaptor
__std::derived_from<typename _Receiver::receiver_concept, receiver_t>);
} // namespace __detail

template <class _Receiver>
inline constexpr bool enable_receiver = __detail::__enable_receiver<_Receiver>; // NOT TO SPEC

template <class _Receiver>
concept receiver = enable_receiver<__decay_t<_Receiver>>
concept receiver = __detail::__enable_receiver<__decay_t<_Receiver>>
&& __environment_provider<__cref_t<_Receiver>>
&& __nothrow_move_constructible<__decay_t<_Receiver>>
&& __std::constructible_from<__decay_t<_Receiver>, _Receiver>;
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1 change: 0 additions & 1 deletion include/stdexec/__detail/__sender_concepts.hpp
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Expand Up @@ -38,7 +38,6 @@ namespace STDEXEC {
namespace __detail {
template <class _Sender>
concept __enable_sender = __std::derived_from<typename _Sender::sender_concept, sender_t>
|| requires { typename _Sender::is_sender; } // NOT TO SPEC back compat
|| __awaitable<_Sender, __detail::__promise<env<>>>;
} // namespace __detail

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