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Fixes.

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This commit is contained in:
JoelKatz
2012-04-10 13:11:20 -07:00
parent 3cac1416ae
commit b093110890
1 changed files with 31 additions and 4 deletions
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35
src/Amount.cpp
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@@ -1,5 +1,6 @@
#include <cmath>
#include <iomanip>
#include <boost/lexical_cast.hpp>
@@ -49,7 +50,9 @@ STAmount* STAmount::construct(SerializerIterator& sit, const char *name)
std::string STAmount::getText() const
{
return boost::lexical_cast<std::string>(static_cast<double>(*this));
std::ostringstream str;
str << std::setprecision(16) << static_cast<double>(*this);
return str.str();
}
void STAmount::add(Serializer& s) const
@@ -138,6 +141,12 @@ STAmount& STAmount::operator-=(uint64 v)
return *this-=STAmount(v);
}
STAmount::operator double() const
{
if(!value) return 0.0;
return (static_cast<double>(value)) * pow(10.0, offset);
}
STAmount operator+(STAmount v1, STAmount v2)
{ // We can check for precision loss here (value%10)!=0
while(v1.offset < v2.offset)
@@ -170,8 +179,26 @@ STAmount operator-(STAmount v1, STAmount v2)
return STAmount(v1.name, v1.value - v2.value, v1.offset);
}
STAmount::operator double() const
STAmount getRate(const STAmount& offerIn, const STAmount& offerOut)
{
if(!value) return 0.0;
return static_cast<double>(value) * pow(10.0, offset);
CBigNum numerator, denominator, quotient;
if(offerOut.value==0) throw std::runtime_error("illegal offer");
if(offerIn.value==0) return STAmount();
if( (BN_zero(&numerator)!=1) || (BN_zero(&denominator)!=1) ||
(BN_add_word(&numerator, offerIn.value)!=1) ||
(BN_add_word(&denominator, offerOut.value)!=1) ||
(BN_mul_word(&numerator, 1000000000000000ull)!=1) ||
(BN_div(&quotient, NULL, &numerator, &denominator, CAutoBN_CTX())!=1) )
throw std::runtime_error("internal bn error");
int offset=offerIn.offset - offerOut.offset - 15;
while(BN_num_bits(&quotient)>60)
{
offset+=3;
BN_div_word(&quotient, 1000);
}
return STAmount(quotient.getulong(), offset);
}