Commit | Line | Data |
---|---|---|
05780f4b MM |
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) { | |
15 | return (x.getSign() == BigInteger::negative) ? | |
16 | (std::string("-") + easyBUtoString(x)) : (easyBUtoString(x)); | |
17 | } | |
18 | ||
19 | BigUnsigned easyStringToBU(const std::string &s) { | |
20 | return BigUnsigned(BigUnsignedInABase(s, 10)); | |
21 | } | |
22 | ||
23 | BigInteger easyStringToBI(const std::string &s) { | |
24 | return (s[0] == '-') ? | |
25 | BigInteger(easyStringToBU(s.substr(1, s.length() - 1)), BigInteger::negative) : | |
26 | BigInteger(easyStringToBU(s)); | |
27 | } | |
28 | ||
29 | // Outputs x to os, obeying the flags `dec', `hex', `bin', and `showbase'. | |
30 | std::ostream &operator <<(std::ostream &os, const BigUnsigned &x) { | |
31 | BigUnsignedInABase::Base base; | |
32 | long osFlags = os.flags(); | |
33 | if (osFlags & os.dec) | |
34 | base = 10; | |
35 | else if (osFlags & os.hex) { | |
36 | base = 16; | |
37 | if (osFlags & os.showbase) | |
38 | os << "0x"; | |
39 | } else if (osFlags & os.oct) { | |
40 | base = 8; | |
41 | if (osFlags & os.showbase) | |
42 | os << '0'; | |
43 | } else | |
44 | throw "std::ostream << BigUnsigned: Could not determine the desired base from output-stream flags"; | |
45 | std::string s = std::string(BigUnsignedInABase(x, base)); | |
46 | os << s; | |
47 | return os; | |
48 | } | |
49 | // Outputs x to os, obeying the flags `dec', `hex', `bin', and `showbase'. | |
50 | // My somewhat arbitrary policy: a negative sign comes before a base indicator (like -0xFF). | |
51 | std::ostream &operator <<(std::ostream &os, const BigInteger &x) { | |
52 | if (x.getSign() == BigInteger::negative) | |
53 | os << '-'; | |
54 | os << (const BigUnsigned &)(x); | |
55 | return os; | |
56 | } |