Commit | Line | Data |
---|---|---|
05780f4b MM |
1 | /* |
2 | * Matt McCutchen's Big Integer Library | |
3 | * http://mysite.verizon.net/mccutchen/bigint/ | |
4 | */ | |
5 | ||
6 | #include "BigIntegerUtils.hh" | |
7 | #include "BigUnsignedInABase.hh" | |
8 | ||
9 | /* | |
10 | * This file includes: | |
11 | * (1) `std::string <=> BigUnsigned/BigInteger' conversion routines easier than `BigUnsignedInABase' | |
12 | * (2) << and >> operators for BigUnsigned/BigInteger, std::istream/std::ostream | |
13 | */ | |
14 | ||
15 | std::string easyBUtoString(const BigUnsigned &x) { | |
16 | return std::string(BigUnsignedInABase(x, 10)); | |
17 | } | |
18 | ||
19 | std::string easyBItoString(const BigInteger &x) { | |
20 | return (x.getSign() == BigInteger::negative) ? | |
21 | (std::string("-") + easyBUtoString(x)) : (easyBUtoString(x)); | |
22 | } | |
23 | ||
24 | BigUnsigned easyStringToBU(const std::string &s) { | |
25 | return BigUnsigned(BigUnsignedInABase(s, 10)); | |
26 | } | |
27 | ||
28 | BigInteger easyStringToBI(const std::string &s) { | |
29 | return (s[0] == '-') ? | |
30 | BigInteger(easyStringToBU(s.substr(1, s.length() - 1)), BigInteger::negative) : | |
31 | BigInteger(easyStringToBU(s)); | |
32 | } | |
33 | ||
34 | // Outputs x to os, obeying the flags `dec', `hex', `bin', and `showbase'. | |
35 | std::ostream &operator <<(std::ostream &os, const BigUnsigned &x) { | |
36 | BigUnsignedInABase::Base base; | |
37 | long osFlags = os.flags(); | |
38 | if (osFlags & os.dec) | |
39 | base = 10; | |
40 | else if (osFlags & os.hex) { | |
41 | base = 16; | |
42 | if (osFlags & os.showbase) | |
43 | os << "0x"; | |
44 | } else if (osFlags & os.oct) { | |
45 | base = 8; | |
46 | if (osFlags & os.showbase) | |
47 | os << '0'; | |
48 | } else | |
49 | throw "std::ostream << BigUnsigned: Could not determine the desired base from output-stream flags"; | |
50 | std::string s = std::string(BigUnsignedInABase(x, base)); | |
51 | os << s; | |
52 | return os; | |
53 | } | |
54 | // Outputs x to os, obeying the flags `dec', `hex', `bin', and `showbase'. | |
55 | // My somewhat arbitrary policy: a negative sign comes before a base indicator (like -0xFF). | |
56 | std::ostream &operator <<(std::ostream &os, const BigInteger &x) { | |
57 | if (x.getSign() == BigInteger::negative) | |
58 | os << '-'; | |
59 | os << (const BigUnsigned &)(x); | |
60 | return os; | |
61 | } |