Undefined reference to function template when used with string (GCC)?

You can't link templates as compiler don't know which code to generate before someone tries to use ( instantiate ) templates.

The compiler needs to see the template definition at the point of instantiation, else the code specialized for the type you instantiate the template with cannot be generated. The correct way is to put the implementation of the template functions in the header file or to #include the . Cc like you did.

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