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LWG-3899 co_yielding elements of an lvalue generator is unnecessarily inefficient #5303

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Merged
StephanTLavavej merged 1 commit into from
Feb 20, 2025
Merged

LWG-3899 co_yielding elements of an lvalue generator is unnecessarily inefficient #5303

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7 changes: 7 additions & 0 deletions stl/inc/generator
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Original file line number Diff line number Diff line change
Expand Up @@ -286,6 +286,13 @@ namespace _Gen_detail {
return _Nested_awaitable{_STD move(_Elem.range)};
}

template <class _Rty, class _Vty, class _Alloc, class _Unused>
requires same_as<_Yield_t<_Reference_t<_Rty, _Vty>>, _Yielded>
_NODISCARD auto yield_value(_RANGES elements_of<generator<_Rty, _Vty, _Alloc>&, _Unused> _Elem) noexcept {
using _Nested_awaitable = _Nested_awaitable_provider<_Rty, _Vty, _Alloc>::_Awaitable;
return _Nested_awaitable{_STD move(_Elem.range)};
}

template <_RANGES input_range _Rng, class _Alloc>
requires convertible_to<_RANGES range_reference_t<_Rng>, _Yielded>
_NODISCARD auto yield_value(_RANGES elements_of<_Rng, _Alloc> _Elem) {
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