摘要：
在使用hash_map的程序中，编译的时候会报出warning，In file included from /usr/include/c++/4.4/ext/hash_map:60, from hash_a.h:6, from test.cpp:5:/usr/include/c++/4.4/backward/backward_warning.h:28:2: warning: #warning This file includes at least one deprecated or antiquated header which may be removed without further n 阅读全文
