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Constexpr Improvements #1789

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Merged
ericniebler merged 2 commits into from
Jan 26, 2026
+9 −6
Merged

Constexpr Improvements #1789

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d0096bc
stdexec::__closure: constexpr
RobertLeahy Jan 25, 2026
8ee3a91
stdexec::__apply: Do Not Deduce Return Type
RobertLeahy Jan 25, 2026
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5 changes: 3 additions & 2 deletions include/stdexec/__detail/__sender_adaptor_closure.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,8 @@ namespace STDEXEC {
template <sender _Sender>
requires __callable<_Fn, _Sender, _As...>
STDEXEC_ATTRIBUTE(host, device, always_inline)
auto operator()(_Sender&& __sndr) && noexcept(__nothrow_callable<_Fn, _Sender, _As...>) {
constexpr auto
operator()(_Sender&& __sndr) && noexcept(__nothrow_callable<_Fn, _Sender, _As...>) {
return STDEXEC::__apply(
static_cast<_Fn&&>(__fn_),
static_cast<__tuple<_As...>&&>(__args_),
Expand All @@ -103,7 +104,7 @@ namespace STDEXEC {
template <sender _Sender>
requires __callable<const _Fn&, _Sender, const _As&...>
STDEXEC_ATTRIBUTE(host, device, always_inline)
auto operator()(_Sender&& __sndr) const & noexcept(
constexpr auto operator()(_Sender&& __sndr) const & noexcept(
__nothrow_callable<const _Fn&, _Sender, const _As&...>) {
return STDEXEC::__apply(__fn_, __args_, static_cast<_Sender&&>(__sndr));
}
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10 changes: 6 additions & 4 deletions include/stdexec/__detail/__tuple.hpp
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Expand Up @@ -219,9 +219,10 @@ namespace STDEXEC {
template <class... _Ts>
using __tuple_t = __mcall<_CvRef, __tuple<_Ts...>>;

template <class... _Ts, class... _Us, __callable<_Us..., __mcall<_CvRef, _Ts>...> _Fn>
void operator()(_Fn&& __fn, __tuple_t<_Ts...>&& __tupl, _Us&&... __us) const
noexcept(__nothrow_callable<_Fn, _Us..., __mcall<_CvRef, _Ts>...>);
template <class... _Ts, class... _Us, __callable<_Us..., __mcall1<_CvRef, _Ts>...> _Fn>
auto operator()(_Fn&& __fn, __tuple_t<_Ts...>&& __tupl, _Us&&... __us) const
noexcept(__nothrow_callable<_Fn, _Us..., __mcall1<_CvRef, _Ts>...>)
-> __call_result_t<_Fn, _Us..., __mcall1<_CvRef, _Ts>...>;
};

template <class _Tuple>
Expand All @@ -232,7 +233,8 @@ namespace STDEXEC {
requires __callable<__impl_t<_Tuple>, _Fn, _Tuple, _Us...>
STDEXEC_ATTRIBUTE(always_inline, host, device)
constexpr auto operator()(_Fn&& __fn, _Tuple&& __tupl, _Us&&... __us) const
noexcept(__nothrow_callable<__impl_t<_Tuple>, _Fn, _Tuple, _Us...>) -> decltype(auto) {
noexcept(__nothrow_callable<__impl_t<_Tuple>, _Fn, _Tuple, _Us...>)
-> __call_result_t<__impl_t<_Tuple>, _Fn, _Tuple, _Us...> {
constexpr size_t __size = STDEXEC_REMOVE_REFERENCE(_Tuple)::__size;

if constexpr (__size == 0) {
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