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1 | #include "BigIntegerUtils.hh" |
2 | #include "BigUnsignedInABase.hh" | |
3 | ||
4 | /* | |
6e1e0f2f MM |
5 | * This file includes: |
6 | * (1) `std::string <=> BigUnsigned/BigInteger' conversion routines easier than `BigUnsignedInABase' | |
7 | * (2) << and >> operators for BigUnsigned/BigInteger, std::istream/std::ostream | |
8 | */ | |
05780f4b MM |
9 | |
10 | std::string easyBUtoString(const BigUnsigned &x) { | |
11 | return std::string(BigUnsignedInABase(x, 10)); | |
12 | } | |
13 | ||
14 | std::string easyBItoString(const BigInteger &x) { | |
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15 | return (x.getSign() == BigInteger::negative) |
16 | ? (std::string("-") + easyBUtoString(x.getMagnitude())) | |
17 | : (easyBUtoString(x.getMagnitude())); | |
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18 | } |
19 | ||
20 | BigUnsigned easyStringToBU(const std::string &s) { | |
21 | return BigUnsigned(BigUnsignedInABase(s, 10)); | |
22 | } | |
23 | ||
24 | BigInteger easyStringToBI(const std::string &s) { | |
25 | return (s[0] == '-') ? | |
26 | BigInteger(easyStringToBU(s.substr(1, s.length() - 1)), BigInteger::negative) : | |
27 | BigInteger(easyStringToBU(s)); | |
28 | } | |
29 | ||
30 | // Outputs x to os, obeying the flags `dec', `hex', `bin', and `showbase'. | |
31 | std::ostream &operator <<(std::ostream &os, const BigUnsigned &x) { | |
32 | BigUnsignedInABase::Base base; | |
33 | long osFlags = os.flags(); | |
34 | if (osFlags & os.dec) | |
35 | base = 10; | |
36 | else if (osFlags & os.hex) { | |
37 | base = 16; | |
38 | if (osFlags & os.showbase) | |
39 | os << "0x"; | |
40 | } else if (osFlags & os.oct) { | |
41 | base = 8; | |
42 | if (osFlags & os.showbase) | |
43 | os << '0'; | |
44 | } else | |
45 | throw "std::ostream << BigUnsigned: Could not determine the desired base from output-stream flags"; | |
46 | std::string s = std::string(BigUnsignedInABase(x, base)); | |
47 | os << s; | |
48 | return os; | |
49 | } | |
50 | // Outputs x to os, obeying the flags `dec', `hex', `bin', and `showbase'. | |
51 | // My somewhat arbitrary policy: a negative sign comes before a base indicator (like -0xFF). | |
52 | std::ostream &operator <<(std::ostream &os, const BigInteger &x) { | |
53 | if (x.getSign() == BigInteger::negative) | |
54 | os << '-'; | |
3e132790 | 55 | os << x.getMagnitude(); |
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56 | return os; |
57 | } |