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05780f4b MM |
1 | /* |
2 | * Matt McCutchen's Big Integer Library | |
05780f4b MM |
3 | */ |
4 | ||
5 | #include "BigIntegerUtils.hh" | |
6 | #include "BigUnsignedInABase.hh" | |
7 | ||
8 | /* | |
9 | * This file includes: | |
10 | * (1) `std::string <=> BigUnsigned/BigInteger' conversion routines easier than `BigUnsignedInABase' | |
11 | * (2) << and >> operators for BigUnsigned/BigInteger, std::istream/std::ostream | |
12 | */ | |
13 | ||
14 | std::string easyBUtoString(const BigUnsigned &x) { | |
15 | return std::string(BigUnsignedInABase(x, 10)); | |
16 | } | |
17 | ||
18 | std::string easyBItoString(const BigInteger &x) { | |
19 | return (x.getSign() == BigInteger::negative) ? | |
20 | (std::string("-") + easyBUtoString(x)) : (easyBUtoString(x)); | |
21 | } | |
22 | ||
23 | BigUnsigned easyStringToBU(const std::string &s) { | |
24 | return BigUnsigned(BigUnsignedInABase(s, 10)); | |
25 | } | |
26 | ||
27 | BigInteger easyStringToBI(const std::string &s) { | |
28 | return (s[0] == '-') ? | |
29 | BigInteger(easyStringToBU(s.substr(1, s.length() - 1)), BigInteger::negative) : | |
30 | BigInteger(easyStringToBU(s)); | |
31 | } | |
32 | ||
33 | // Outputs x to os, obeying the flags `dec', `hex', `bin', and `showbase'. | |
34 | std::ostream &operator <<(std::ostream &os, const BigUnsigned &x) { | |
35 | BigUnsignedInABase::Base base; | |
36 | long osFlags = os.flags(); | |
37 | if (osFlags & os.dec) | |
38 | base = 10; | |
39 | else if (osFlags & os.hex) { | |
40 | base = 16; | |
41 | if (osFlags & os.showbase) | |
42 | os << "0x"; | |
43 | } else if (osFlags & os.oct) { | |
44 | base = 8; | |
45 | if (osFlags & os.showbase) | |
46 | os << '0'; | |
47 | } else | |
48 | throw "std::ostream << BigUnsigned: Could not determine the desired base from output-stream flags"; | |
49 | std::string s = std::string(BigUnsignedInABase(x, base)); | |
50 | os << s; | |
51 | return os; | |
52 | } | |
53 | // Outputs x to os, obeying the flags `dec', `hex', `bin', and `showbase'. | |
54 | // My somewhat arbitrary policy: a negative sign comes before a base indicator (like -0xFF). | |
55 | std::ostream &operator <<(std::ostream &os, const BigInteger &x) { | |
56 | if (x.getSign() == BigInteger::negative) | |
57 | os << '-'; | |
58 | os << (const BigUnsigned &)(x); | |
59 | return os; | |
60 | } |