mirror of
https://github.com/XRPLF/rippled.git
synced 2025-12-06 17:27:55 +00:00
84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
#ifndef __CURRENCY__
|
|
#define __CURRENCY__
|
|
|
|
// CAUTION: This is currently dead code based on the old currency scheme.
|
|
// It will be updated to use the new STAmount code
|
|
|
|
#include <string>
|
|
|
|
#include "uint256.h"
|
|
|
|
enum CurrencyType
|
|
{
|
|
ctNATIVE, // Currency transaction fees are paid in
|
|
ctNATIONAL, // State-issued or ISO-recognized currencies
|
|
ctCUSTOM, // Custom currencies
|
|
};
|
|
|
|
class Currency
|
|
{
|
|
protected:
|
|
uint160 mValue;
|
|
CurrencyType mType;
|
|
|
|
static uint160 sNatMask; // bits that indicate national currency ISO code and version
|
|
static uint160 sNatZero; // bits that must be zero on a national currency
|
|
|
|
public:
|
|
Currency() : mType(ctNATIVE) { ; }
|
|
Currency(const uint160& v);
|
|
Currency(const std::string& iso, uint16 version, unsigned char scale);
|
|
|
|
bool isCommensurate(const Currency&) const;
|
|
bool isNational() const { return mType == ctNATIONAL; }
|
|
bool isNative() const { return mType == ctNATIVE; }
|
|
bool isCustom() const { return mType == ctCUSTOM; }
|
|
|
|
const uint160& getCurrency() { return mValue; }
|
|
unsigned char getScale() const;
|
|
void setScale(unsigned char c);
|
|
|
|
// These are only valid for national currencies
|
|
std::string getISO() const;
|
|
uint16 getVersion() const;
|
|
};
|
|
|
|
class Amount
|
|
{
|
|
// CAUTION: Currency operations throw on overflows, underflos, or
|
|
// incommensurate currency opeations (like adding USD to Euros)
|
|
protected:
|
|
Currency mCurrency;
|
|
uint64 mQuantity;
|
|
|
|
void canonicalize();
|
|
|
|
static uint64 sMaxCanon; // Max native currency value before shift
|
|
|
|
public:
|
|
|
|
Amount(const Currency& c, const uint64& q) : mCurrency(c), mQuantity(q) { canonicalize(); }
|
|
|
|
const Currency& getCurrency() const { return mCurrency; }
|
|
uint64 getQuantity() const { return mQuantity; }
|
|
double getDisplayQuantity() const;
|
|
|
|
// These throw if the currencies are incommensurate
|
|
// They handle scaling and represent the result as accurately as possible
|
|
bool operator==(const Amount&) const;
|
|
bool operator!=(const Amount&) const;
|
|
bool operator>=(const Amount&) const;
|
|
bool operator<=(const Amount&) const;
|
|
bool operator>(const Amount&) const;
|
|
bool operator<(const Amount&) const;
|
|
Amount& operator+=(const Amount& a) { return *this = *this + a; }
|
|
Amount& operator-=(const Amount& a) { return *this = *this - a; }
|
|
|
|
// This is used to score offers and works with incommensurate currencies
|
|
friend void divide(const Amount& offering, const Amount& taking, uint16& exponent, uint64& mantissa);
|
|
friend Amount& operator+(const Amount&, const Amount&);
|
|
friend Amount& operator-(const Amount&, const Amount&);
|
|
};
|
|
|
|
#endif
|