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remove the redundant copy when move item to the front of the lru list in lru_cache.hpp #870

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faker2048 wants to merge 1 commit into boostorg:master from faker2048:master

faker2048 commented Oct 4, 2021

std::list<T,Allocator>::splice is the helper for to move list element in constant complexity.

Complexity
1-2) Constant.
3) Constant if other refers to the same object as *this, otherwise linear in std::distance(first, last).

Ref: https://en.cppreference.com/w/cpp/container/list/splice


          remove the redundant copy when move item to the front of the most rec…

0de1201

…ently used list

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