//这个地方说的是vc6/7的成员模板的一些问题。
// VC++ 6/7 has member templates but they have numerous problems including
// cases of silent failure, so for safety we define:
# define BOOST_NO_MEMBER_TEMPLATES
// For VC++ experts wishing to attempt workarounds, we define:
# define BOOST_MSVC6_MEMBER_TEMPLATES
# if (_MSC_VER > 1200)
# define BOOST_NO_MEMBER_FUNCTION_SPECIALIZATIONS
# endif
// VC++ 6/7 has member templates but they have numerous problems including
// cases of silent failure, so for safety we define:
# define BOOST_NO_MEMBER_TEMPLATES
// For VC++ experts wishing to attempt workarounds, we define:
# define BOOST_MSVC6_MEMBER_TEMPLATES