Extended return type of `search` with `std::tuple<Derived*, bool>` me… #83

Job	Run time
style_check	12s
debug (clang)	1m 52s
optimizations (clang, Release)	36s
debug (gcc)	2m 5s
optimizations (clang, MinSizeRel)	47s
optimizations (gcc, Release)	49s
optimizations (gcc, MinSizeRel)	28s
	6m 49s

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