P3815R1 Add scope_association concept to P3149 #8531
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Fixes NB FI-392, CA-393 (C++26 CD).
eisenwave
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Nov 15, 2025
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| using assoc_t = associate_data_t::assoc-t; | ||
| using sender_ref_t = associate_data_t::sender-ref; |
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| using assoc_t = associate_data_t::assoc-t; | |
| using sender_ref_t = associate_data_t::sender-ref; | |
| using assoc_t = associate_data_t::@\exposid{assoc-t}@; | |
| using sender_ref_t = associate_data_t::@\exposid{sender-ref}@; |
| explicit op_state(pair<assoc_t, sender_ref_t> parts, Rcvr& r) | ||
| : assoc(std::move(parts.first)) { | ||
| if (assoc) | ||
| ::new (voidify(op)) op_t(connect(std::move(*parts.second), std::move(r))); |
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| ::new (voidify(op)) op_t(connect(std::move(*parts.second), std::move(r))); | |
| ::new (@\exposid{voidify}@(op)) op_t(connect(std::move(*parts.second), std::move(r))); |
| \begin{codeblock} | ||
| is_nothrow_constructible_v<remove_cvref_t<Sndr>, Sndr> && | ||
| is_nothrow_move_constructible_v<@\exposid{wrap-sender}@> && | ||
| (is_same_v<Sndr, remove_cvref_t> || |
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is_same_v<Sndr, remove_cvref_t> ?! ?!
| \indexlibrarymember{\exposid{run}}{execution::\exposid{spawn-state}}% | ||
| \begin{itemdecl} | ||
| void @\exposid{run}@(); | ||
| void @\exposid{run}@() noexcept; |
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Forgot to make it noexcept in synopsis.
source/exec.tex
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| movable<Assoc> && | ||
| is_nothrow_move_constructible_v<Assoc> && | ||
| is_nothrow_move_assignable_v<Assoc> && | ||
| default_initializable<Assoc> && |
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| default_initializable<Assoc> && | |
| @\libconcept{default_initializable}@<Assoc> && |
| requires(const Token token) { | ||
| { token.try_associate() } -> @\libconcept{same_as}@<bool>; | ||
| { token.disassociate() } noexcept -> @\libconcept{same_as}@<void>; | ||
| { token.try_associate() } -> @\libconcept{scope_association}@<bool>; |
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Maybe this fix would be worth a separate fixup commit; it's not in the paper at least.
| }; | ||
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| template<class Scope> | ||
| @\exposid{struct association-t}@; // \expos |
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| @\exposid{struct association-t}@; // \expos | |
| struct @\exposid{association-t}@; // \expos |
| \item | ||
| if \tcode{assoc} is engaged, | ||
| then \tcode{assoc.try_associate()} is equivalent to | ||
| \tcode{assoc.scope->try-associate()}, and |
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| \tcode{assoc.scope->try-associate()}, and | |
| \tcode{assoc.scope->\exposid{try-associate}()}, and |
| \tcode{assoc.scope->try-associate()}, and | ||
| \item | ||
| the association owned by \tcode{assoc} | ||
| is released by invoking \tcode{assoc.scope->disassociate()}. |
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| is released by invoking \tcode{assoc.scope->disassociate()}. | |
| is released by invoking \tcode{assoc.scope->\exposid{disassociate}()}. |
| \pnum | ||
| \effects | ||
| If \exposid{count} is equal to \tcode{max_associations}, | ||
| then no effects. Otherwise, if \exposid{state} is |
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| then no effects. Otherwise, if \exposid{state} is | |
| then no effects. | |
| Otherwise, if \exposid{state} is |
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Fixes NB FI-392, CA-393 (C++26 CD).
Fixes #8475
Fixes cplusplus/papers#2426
Fixes cplusplus/nbballot#967
Fixes cplusplus/nbballot#968