Youcompleteme can't find std lib in class's method

Question

I use Youcompleteme to auto complete my c++ code.

But I found can't find the std lib in class's method, like follows.

But in globe function, it works fine.

Also, ycm can't find the local lib, after I put the header in /usr/local/include

ls /usr/local/include/ | grep brpc get the brpc there.

I use the https://github.com/JDevlieghere/dotfiles/blob/master/.vim/.ycm_extra_conf.py config.

But change the flags follows.

C_BASE_FLAGS = [
    ┊   '-Wall',
    ┊   '-Wextra',
    ┊   '-Werror',
    ┊   '-Wno-long-long',
    ┊   '-Wno-variadic-macros',
    ┊   '-fexceptions',
    ┊   '-ferror-limit=10000',
    ┊   '-DNDEBUG',
    ┊   '-std=c11',
    ┊   '-I/usr/lib/',
    ┊   '-I/usr/include/'
    ┊   ]

CPP_BASE_FLAGS = [
    ┊   '-Wall',
    ┊   '-Wextra',
    ┊   '-Wno-long-long',
    ┊   '-Wno-variadic-macros',
    ┊   '-fexceptions',
    ┊   '-ferror-limit=10000',
    ┊   '-DNDEBUG',
    ┊   '-std=c++11',
    ┊   '-xc++',
    ┊   '-I/usr/lib/',
    ┊   '-I/usr/include/'
    ┊   '-I/usr/local/lib'
    ┊   '-I/usr/local/include'
    ┊   ]

gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.10)