您已经在源文件中实现了模板ServerInterface<CustomMessageTypes>。要么将实现移到头文件中（通常就是这样...
Try building the project. As we have included the header files (that provide the definitions forsqlite3_xxx()functions), but have not referenced the library defining them, the linker will fail due to missing definitions for the sqlite3 functions: In order to fix the “undefined reference to ...