[libcxx-commits] [libcxx] [libc++] optimization on ranges::drop_view::begin (#72883) (PR #72929)

[Hongyu Ouyang via libcxx-commits]

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@@ -90,6 +90,10 @@ namespace ranges {
       requires (!(__simple_view<_View> &&
                   random_access_range<const _View> && sized_range<const _View>))
     {
+      if constexpr (random_access_range<const _View> && sized_range<const _View>) {
+        auto __dist = ranges::distance(__base_);
+        return ranges::begin(__base_) + std::min<range_difference_t<_View>>(__count_, __dist);
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casavaca wrote:

Yep, got it.

https://github.com/llvm/llvm-project/pull/72929