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Implement STAmount::getRate.

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This commit is contained in:
JoelKatz
2012-08-09 16:03:00 -07:00
parent 4e99d8d7bd
commit 1aa15c62e1
2 changed files with 24 additions and 9 deletions
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32
src/Amount.cpp
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@@ -446,7 +446,7 @@ bool STAmount::operator==(const STAmount& a) const
bool STAmount::operator!=(const STAmount& a) const
{
return (mOffset != a.mOffset) || (mValue != a.mValue) || (mIsNegative!= a.mIsNegative) || !isComparable(a);
return (mOffset != a.mOffset) || (mValue != a.mValue) || (mIsNegative != a.mIsNegative) || !isComparable(a);
}
bool STAmount::operator<(const STAmount& a) const
@@ -762,6 +762,14 @@ uint64 STAmount::getRate(const STAmount& offerOut, const STAmount& offerIn)
return (ret << (64 - 8)) | r.getMantissa();
}
STAmount STAmount::setRate(uint64 rate, const uint160& currencyOut)
{
uint64 mantissa = rate & ~(255ull << (64 - 8));
int exponent = static_cast<int>(rate >> (64 - 8)) - 100;
return STAmount(currencyOut, mantissa, exponent);
}
// Taker gets all taker can pay for with saTakerFunds, limited by saOfferPays and saOfferFunds.
// --> saOfferFunds: Limit for saOfferPays
// --> saTakerFunds: Limit for saOfferGets : How much taker really wants. : Driver
@@ -1105,6 +1113,12 @@ BOOST_AUTO_TEST_CASE( CustomCurrency_test )
if (STAmount::divide(STAmount(currency, 60) , STAmount(currency, 3), uint160()).getText() != "20")
BOOST_FAIL("STAmount divide fail");
STAmount a1(currency, 60), a2 (currency, 10, -1);
if(STAmount::divide(a2, a1, currency) != STAmount::setRate(STAmount::getRate(a1, a2), currency))
BOOST_FAIL("STAmount setRate(getRate) fail");
if(STAmount::divide(a1, a2, currency) != STAmount::setRate(STAmount::getRate(a2, a1), currency))
BOOST_FAIL("STAmount setRate(getRate) fail");
BOOST_TEST_MESSAGE("Amount CC Complete");
}
@@ -1115,21 +1129,21 @@ BOOST_AUTO_TEST_CASE( CurrencyMulDivTests )
uint160 c(1);
if (STAmount::getRate(STAmount(1), STAmount(10)) != (((100ul-14)<<(64-8))|1000000000000000ul))
BOOST_FAIL("STAmount getrate fail");
BOOST_FAIL("STAmount getRate fail");
if (STAmount::getRate(STAmount(10), STAmount(1)) != (((100ul-16)<<(64-8))|1000000000000000ul))
BOOST_FAIL("STAmount getrate fail");
BOOST_FAIL("STAmount getRate fail");
if (STAmount::getRate(STAmount(c, 1), STAmount(c, 10)) != (((100ul-14)<<(64-8))|1000000000000000ul))
BOOST_FAIL("STAmount getrate fail");
BOOST_FAIL("STAmount getRate fail");
if (STAmount::getRate(STAmount(c, 10), STAmount(c, 1)) != (((100ul-16)<<(64-8))|1000000000000000ul))
BOOST_FAIL("STAmount getrate fail");
BOOST_FAIL("STAmount getRate fail");
if (STAmount::getRate(STAmount(c, 1), STAmount(10)) != (((100ul-14)<<(64-8))|1000000000000000ul))
BOOST_FAIL("STAmount getrate fail");
BOOST_FAIL("STAmount getRate fail");
if (STAmount::getRate(STAmount(c, 10), STAmount(1)) != (((100ul-16)<<(64-8))|1000000000000000ul))
BOOST_FAIL("STAmount getrate fail");
BOOST_FAIL("STAmount getRate fail");
if (STAmount::getRate(STAmount(1), STAmount(c, 10)) != (((100ul-14)<<(64-8))|1000000000000000ul))
BOOST_FAIL("STAmount getrate fail");
BOOST_FAIL("STAmount getRate fail");
if (STAmount::getRate(STAmount(10), STAmount(c, 1)) != (((100ul-16)<<(64-8))|1000000000000000ul))
BOOST_FAIL("STAmount getrate fail");
BOOST_FAIL("STAmount getRate fail");
}

1
src/SerializedTypes.h
View File

@@ -343,6 +343,7 @@ public:
// Someone is offering X for Y, what is the rate?
static uint64 getRate(const STAmount& offerOut, const STAmount& offerIn);
static STAmount setRate(uint64 rate, const uint160& currencyOut);
// Someone is offering X for Y, I try to pay Z, how much do I get?
// And what's left of the offer? And how much do I actually pay?