定义模板函数的时候，如果声明和定义不同时在h就会这样报错，需要都定义在头文件里
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'gets' undeclared here (not in a function)
C++ "multiple definition of .. first defined here"
C++ "multiple definition of .. first defined here"
unused function warning message
The openssl extension is required for SSL/TLS protection but is not available
the number of available CPUs 1 is less than the required 2
repo init warning: gpg (GnuPG) is not available.
解决insmod error required key not available
Warning: Function created with compilation errors.
warning: Unexpected unnamed function (func-names)