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		@@ -8,6 +8,13 @@ https://www.boost.org/LICENSE_1_0.txt
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# Revision History
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:idprefix:
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## Changes in Boost 1.81
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* The macro `BOOST_SYSTEM_DISABLE_THREADS` can now be defined to disable
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  the use of `<mutex>` (e.g. on single-threaded libstdc++).
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* Added `value_type`, `error_type`, `in_place_value`, `in_place_error`
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  to `result<>`.
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## Changes in Boost 1.80
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* When an `error_code` is converted to `std::error_code` and then back
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