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authorPatrick Palka <ppalka@redhat.com>2024-08-22 09:24:39 -0400
committerPatrick Palka <ppalka@redhat.com>2024-08-22 09:24:39 -0400
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libstdc++: Optimize std::projected<I, std::identity>
Algorithms that are generalized to take projections typically default the projection to std::identity, which is equivalent to no projection at all. In that case, I believe we could shortcut the projection logic to return the iterator unchanged rather than wrapping it. This should reduce compile times especially after P2609R3 which made the indirect invocability concepts more expensive to check when actual projections are involved. libstdc++-v3/ChangeLog: * include/bits/iterator_concepts.h (__detail::__projected): Define an optimized partial specialization for when the projection is std::identity. * testsuite/24_iterators/indirect_callable/projected.cc: Verify the optimization. Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
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