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

Open

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

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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).


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

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...ently used list