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## History

##### Boost 1.45.0

- Added new traits add_rvalue_reference, add_lvalue_reference and common_type.
- Minor fixes to is_signed, is_unsigned and is_virtual_base_of.

##### Boost 1.44.0

- Added support for rvalue references throughout the library, plus two new traits classes is_rvalue_reference and is_lvalue_reference. Fixes #4407 and #3804.
- Fixed ticket #3621.

##### Boost 1.42.0

- Fixed issue #3704.