在C++中使用hash_map時，警告如下：
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/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/backward/backward_warning.h:28:2: 警告：#warning This file includes at least one deprecated or antiquated header which may be removed without further notice at a future date. Please use a non-deprecated interface with equivalent functionality instead. For a listing of replacement headers and interfaces, consult the file backward_warning.h. To disable this warning use -Wno-deprecated.
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/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/backward/backward_warning.h:28:2: 警告：#warning This file includes at least one deprecated or antiquated header which may be removed without further notice at a future date. Please use a non-deprecated interface with equivalent functionality instead. For a listing of replacement headers and interfaces, consult the file backward_warning.h. To disable this warning use -Wno-deprecated.
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如果使用的話，還有報錯。
報錯與警告的解決方案：
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set(CMAKE_CXX_FLAGS "-std=c++0x -Wno-deprecated")
set(CMAKE_CXX_FLAGS "-std=c++0x -Wno-deprecated")
就是在CXX_FLAGS中添加-std=c++0x 以及 -Wno-deprecated這兩個選項
這兩個選項的意思：c++0x是新的C++意思。而-Wno-deprecated是表示 no-deprecated這類警告忽略。
