libs/bigint/BigIntegerUtils.cc

   1 #include "BigIntegerUtils.hh"
   2 #include "BigUnsignedInABase.hh"
   3
   4 std::string bigUnsignedToString(const BigUnsigned &x) {
   5         return std::string(BigUnsignedInABase(x, 10));
   6 }
   7
   8 std::string bigIntegerToString(const BigInteger &x) {
   9         return (x.getSign() == BigInteger::negative)
  10                 ? (std::string("-") + bigUnsignedToString(x.getMagnitude()))
  11                 : (bigUnsignedToString(x.getMagnitude()));
  12 }
  13
  14 BigUnsigned stringToBigUnsigned(const std::string &s) {
  15         return BigUnsigned(BigUnsignedInABase(s, 10));
  16 }
  17
  18 BigInteger stringToBigInteger(const std::string &s) {
  19         // Recognize a sign followed by a BigUnsigned.
  20         return (s[0] == '-') ? BigInteger(stringToBigUnsigned(s.substr(1, s.length() - 1)), BigInteger::negative)
  21                 : (s[0] == '+') ? BigInteger(stringToBigUnsigned(s.substr(1, s.length() - 1)))
  22                 : BigInteger(stringToBigUnsigned(s));
  23 }
  24
  25 std::ostream &operator <<(std::ostream &os, const BigUnsigned &x) {
  26         BigUnsignedInABase::Base base;
  27         long osFlags = os.flags();
  28         if (osFlags & os.dec)
  29                 base = 10;
  30         else if (osFlags & os.hex) {
  31                 base = 16;
  32                 if (osFlags & os.showbase)
  33                         os << "0x";
  34         } else if (osFlags & os.oct) {
  35                 base = 8;
  36                 if (osFlags & os.showbase)
  37                         os << '0';
  38         } else
  39                 throw "std::ostream << BigUnsigned: Could not determine the desired base from output-stream flags";
  40         std::string s = std::string(BigUnsignedInABase(x, base));
  41         os << s;
  42         return os;
  43 }
  44
  45 std::ostream &operator <<(std::ostream &os, const BigInteger &x) {
  46         if (x.getSign() == BigInteger::negative)
  47                 os << '-';
  48         os << x.getMagnitude();
  49         return os;
  50 }