xapian相关

1. how to enable log

    ./configure --enable-log=yes

    add environment: XAPIAN_DEBUG_LOG=- and XAPIAN_DEBUG_FLAGS=-

    more detail, see HACKING doc in source code root directory

    

    and also, default log fd=2, so change fd=1 in debuglog.cc->initialise_categories_mask() function


c++ pimpl，解耦合以及减少编译时间的方法
http://www.gamedev.net/page/resources/_/technical/general-programming/the-c-pimpl-r1794

智能指针：
http://3140618.blog.163.com/blog/static/7451797201151494440368/
http://rkusanagi.blog.sohu.com/168824404.html
http://www.cnblogs.com/rocketfan/archive/2010/08/09/1796054.html