34b2e934ea
Fixes #108624 This allows `flat_map::insert(Iter, Iter)` to directly forward to underlying containers' `insert(Iter, Iter)`, instead of inserting one element at a time, when input models "product iterator". atm, `flat_map::iterator` and `zip_view::iterator` are "product iterator"s. This gives about almost 10x speed up in my benchmark with -03 (for both before and after) ```cpp Benchmark Time CPU Time Old Time New CPU Old CPU New ----------------------------------------------------------------------------------------------------------------------------------------------- flat_map::insert_product_iterator_flat_map/32 -0.5028 -0.5320 149 74 149 70 flat_map::insert_product_iterator_flat_map/1024 -0.8617 -0.8618 3113 430 3112 430 flat_map::insert_product_iterator_flat_map/8192 -0.8877 -0.8877 26682 2995 26679 2995 flat_map::insert_product_iterator_flat_map/65536 -0.8769 -0.8769 226235 27844 226221 27841 flat_map::insert_product_iterator_zip/32 -0.5844 -0.5844 162 67 162 67 flat_map::insert_product_iterator_zip/1024 -0.8754 -0.8754 3427 427 3427 427 flat_map::insert_product_iterator_zip/8192 -0.8934 -0.8934 28134 3000 28132 3000 flat_map::insert_product_iterator_zip/65536 -0.8783 -0.8783 229783 27960 229767 27958 OVERALL_GEOMEAN -0.8319 -0.8332 0 0 0 0 ``` --------- Co-authored-by: Louis Dionne <ldionne.2@gmail.com>
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