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Code to compute how much you need to pay to get a particular output from an offer.

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JoelKatz
2012-04-10 16:04:28 -07:00
parent 6bf6d86cd9
commit ce30701744
1 changed files with 10 additions and 0 deletions
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10
src/Amount.cpp
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@@ -234,6 +234,8 @@ STAmount operator*(const STAmount &v1, const STAmount &v2)
STAmount getRate(const STAmount& offerOut, const STAmount& offerIn) STAmount getRate(const STAmount& offerOut, const STAmount& offerIn)
{ {
// offerOut = how much comes out of the offer, from the offeror to the taker
// offerIn = how much goes into the offer, from the taker to the offeror
return offerOut / offerIn; return offerOut / offerIn;
} }
@@ -271,3 +273,11 @@ STAmount getClaimed(STAmount& offerOut, STAmount& offerIn, STAmount& paid)
} }
return ret; return ret;
} }
STAmount getNeeded(const STAmount& offerOut, const STAmount& offerIn, const STAmount& needed)
{ // Someone wants to get (needed) out of the offer, how much should they pay in?
if(offerOut.isZero()) return STAmount();
if(needed >= offerOut) return needed;
STAmount ret = needed * (offerIn / offerOut);
return (ret > offerIn) ? offerIn : ret;
}