“undefined reference to”c++ template

You need to use the  export   keyword. However, I don't think G++ has proper support, so you need to include the template function's definition in the header so the translation unit can use it. This is because the  <int>   'version' of the template hasn't been created, only the  <typename T>   'version.'

An easy way is to  #include   the .cpp file. However, this can cause problems, e.g. when other functions are in the .cpp file. It will also likely increase the compile time.

A clean way is to move your template functions into its own .cpp file, and include that in the header  or   use the  export   keyword and compile it separately.

c++中template不支持声明和实现分别放在不同的文件中。可以通过include cpp文件解决这个问题。