It instructs the linker that it should export the function
Add when building a DLL so that it can be called by other programs or DLLs when loading the DLL containing that function.
See also
dllexport, dllimport[
^] in the MSDN.
The
import attribute is the opposite:
It tells the linker that the function is not located in the program or DLL that is actually build but contained in another DLL.
When buidling a DLL, you can use the
export attribute to avoid creating a module-definition file. The
import attribute can then be used in the header file for that DLL to be included when building an application or DLL that loads the DLL.
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