Reload dynamic library DLL

Dynamic library dll can also be reloaded, as shown in the following example:
// DLL. cpp
# Include "DLL. H"
Extern "C ++" int max (int A, int B)
{
Return A> B? A: B;
}
Extern "C ++" float max (float a, float B)
{
Return A> B? A: B;
}
Int min (int A, int B)
{
Return A> B? B:;
}
// DLL. h
# Ifdef dll_api
# Else
# Define dll_api _ declspec (dllexport)
# Endif

Dll_api int max (int A, int B );//
Dll_api float max (float a, float B );//
Dll_api int min (int A, int B );
However, the dynamic library after heavy load will no longer be called by the C language, but can only be used in the C ++ Language
Therefore, the general dynamic library does not provide overloading and adds extern "c" to the function to leave interfaces for C.