The addition and integration of numeric_cast_traits.hpp to boost numeric is breaking compiles on the trunk which use numeric. I am attempting to compile quickbook, only to see: gcc.compile.c++ ..\..\bin.v2\tools\quickbook\src\gcc-mingw-4.6.0\release\link-st atic\quickbook.o gcc.compile.c++ ..\..\bin.v2\tools\quickbook\src\gcc-mingw-4.6.0\release\link-st atic\actions.o In file included from ..\../boost/numeric/conversion/numeric_cast_traits.hpp:28: 0, from ..\../boost/numeric/conversion/cast.hpp:34, from ..\../boost/lexical_cast.hpp:40, from src\actions.cpp:19: ..\../boost/numeric/conversion/detail/numeric_cast_traits.hpp:77:31: error: miss ing binary operator before token "(" ..\../boost/numeric/conversion/detail/numeric_cast_traits.hpp:82:31: error: miss ing binary operator before token "(" etc. The same errors occur with msvc-10.0. These changes need to be fixed or reverted. Too many things depend on numeric_cast for this to remain broken.