An empty CPP file containing only inclusion of <boost/integer.hpp>: --------------- #include <boost/integer.hpp> --------------- does not compile in MS Visual Studio 8.0 Standard when /Za option ("Disable Language Extensions") is used. The output is following: --------------- D:\Libraries\boost_1_41_0\boost/integer_fwd.hpp(70) : error C2039: 'long_long_type' : is not a member of 'boost' D:\Libraries\boost_1_41_0\boost/integer_fwd.hpp(70) : error C2065: 'long_long_type' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer_fwd.hpp(70) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_fwd.hpp(73) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_traits.hpp(67) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_traits.hpp(73) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_traits.hpp(79) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_traits.hpp(85) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_traits.hpp(119) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_traits.hpp(126) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_traits.hpp(132) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_traits.hpp(138) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_traits.hpp(144) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_traits.hpp(150) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer_traits.hpp(156) : error C2913: explicit specialization; 'boost::integer_traits' is not a specialization of a class template D:\Libraries\boost_1_41_0\boost/integer.hpp(88) : error C2065: 'const_max' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer.hpp(94) : see reference to class template instantiation 'boost::int_max_value_t<MaxValue>' being compiled D:\Libraries\boost_1_41_0\boost/integer.hpp(89) : error C2065: 'const_max' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer.hpp(90) : error C2065: 'const_max' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer.hpp(91) : error C2065: 'const_max' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer.hpp(101) : error C2065: 'const_min' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer.hpp(107) : see reference to class template instantiation 'boost::int_min_value_t<MinValue>' being compiled D:\Libraries\boost_1_41_0\boost/integer.hpp(102) : error C2065: 'const_min' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer.hpp(103) : error C2065: 'const_min' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer.hpp(104) : error C2065: 'const_min' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer.hpp(116) : error C2065: 'const_max' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer.hpp(122) : see reference to class template instantiation 'boost::uint_value_t<Value>' being compiled D:\Libraries\boost_1_41_0\boost/integer.hpp(117) : error C2065: 'const_max' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer.hpp(118) : error C2065: 'const_max' : undeclared identifier D:\Libraries\boost_1_41_0\boost/integer.hpp(119) : error C2065: 'const_max' : undeclared identifier --------------- I suppose this happens to other editions as well. Also it seems that the same happens with 2005 version. 1.40 version had the same problem and I reported it but it seems no one cared about it. Adam Badura