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[libc++] Specialize allocator_traits for std::allocator #160278

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[libc++] Specialize allocator_traits for std::allocator #160278

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@philnik777 philnik777 commented Sep 23, 2025

This reduces the time to instantiate allocator_traits<allocator<T>> from ~0.7ms to ~0.07ms, or reduces the time to instantiate vector<T> by ~28%.
@philnik777 philnik777 force-pushed the specialize_allocator_traits branch from 47c2e35 to ed3fd0d Compare November 28, 2025 10:47
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