Refine transform iterator

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Update Doxygen options

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rewrite

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Remove poller.{hpp,cpp}

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Fix intruse::list api

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Rewrite

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Revert "Fix intruse::list api"

This reverts commit 6510e3d4fffcaa8f13c12b16a1074bc2a28e03b4.
fix intrusive data structure

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Update test cases

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Change timer API

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Remove spin/time.hpp

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Kill unused parameter of merge

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refine

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Extract service_template.hpp

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Add thread pool

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Fix timer relay

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Fix event loop interrupted exec path

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Update example

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