先尝试了yum安装但貌似尚无库存：

[root@ ~]# yum install  libstdc++-docs 
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * addons: mirrors.163.com
 * base: mirrors.163.com
 * epel: mirrors.ustc.edu.cn
 * extras: mirrors.163.com
 * updates: mirrors.163.com
Setting up Install Process
No package libstdc++-docs available.
Nothing to do
[root@ ~]# yum search c++|grep docs
boost-doc.x86_64 : The Boost C++ html docs