[ns] How to call a function in C++ file

[Liceven]

Hello,All,
  I want to calculate the signal strength received from two access points in
free space. And I find there is a function called 
double FreeSpace::Pr(PacketStamp *t, PacketStamp *r, WirelessPhy *ifp)
{...}[ns-2.31/mobile/propagation.cc]
But, I don't know how to call this function to calculate the value of SS,
so, could you do me a favor?
Actually I don't know if this function works or not? if not, is there any
way ?
Thanks.
Leyond

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