[def863] | 1 | /* |
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| 2 | * lib_q.h |
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| 3 | * |
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| 4 | * Created on: Sep 29, 2010 |
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| 5 | * Author: anders |
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| 6 | */ |
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| 7 | |
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| 8 | #ifndef LIB_Q_H_ |
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| 9 | #define LIB_Q_H_ |
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| 10 | |
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| 11 | #include <string.h> |
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| 12 | #include <ostream> |
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| 13 | #include "gmp.h" |
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| 14 | |
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| 15 | #include "gfanlib_z.h" |
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| 16 | |
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| 17 | namespace gfan{ |
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| 18 | class Rational |
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| 19 | { |
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| 20 | mpq_t value; |
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| 21 | public: |
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| 22 | static bool isField() |
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| 23 | { |
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| 24 | return true; |
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| 25 | } |
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| 26 | Rational() |
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| 27 | { |
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| 28 | mpq_init(value); |
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| 29 | } |
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| 30 | Rational(signed long int value_) |
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| 31 | { |
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| 32 | mpq_init(value); |
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[26b713] | 33 | mpz_set_si(mpq_numref(value), value_); |
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| 34 | mpz_set_ui(mpq_denref(value), 1); |
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[def863] | 35 | mpq_canonicalize(value); |
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| 36 | } |
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| 37 | Rational(Rational const & value_) |
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| 38 | { |
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| 39 | mpq_init(value); |
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| 40 | mpq_set(value,value_.value); |
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| 41 | } |
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| 42 | Rational(mpq_t value_) |
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| 43 | { |
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| 44 | mpq_init(value); |
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| 45 | mpq_set(value,value_); |
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| 46 | } |
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| 47 | explicit Rational(Integer const & value_) |
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| 48 | { |
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| 49 | mpq_init(value); |
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[26b713] | 50 | mpz_set(mpq_numref(value), value_.value); |
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| 51 | mpz_set_ui(mpq_denref(value), 1); |
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[def863] | 52 | mpq_canonicalize(value); |
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| 53 | } |
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| 54 | ~Rational() |
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| 55 | { |
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| 56 | mpq_clear(value); |
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| 57 | } |
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| 58 | Rational& operator=(const Rational& a) |
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| 59 | { |
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| 60 | const Rational *A=(const Rational*)&a; |
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| 61 | if (this != A) { |
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| 62 | mpq_clear(value); |
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| 63 | mpq_init(value); |
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| 64 | mpq_set(value,a.value); |
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| 65 | } |
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| 66 | return *this; |
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| 67 | } |
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| 68 | bool isZero()const{ |
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| 69 | return mpz_sgn(mpq_numref(value))==0; |
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| 70 | } |
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| 71 | friend std::ostream &operator<<(std::ostream &f, Rational const &a) |
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| 72 | { |
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| 73 | void (*freefunc)(void *, size_t); |
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| 74 | mp_get_memory_functions(0,0,&freefunc); |
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| 75 | char *str=mpq_get_str(0,10,a.value); |
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| 76 | f<<str; |
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| 77 | freefunc(str,strlen(str)+1); |
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| 78 | return f; |
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| 79 | } |
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| 80 | Rational& operator+=(const Rational& a) |
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| 81 | { |
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| 82 | mpq_add(value,value,a.value); |
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| 83 | return *this; |
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| 84 | } |
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| 85 | Rational& operator-=(const Rational& a) |
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| 86 | { |
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| 87 | mpq_sub(value,value,a.value); |
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| 88 | return *this; |
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| 89 | } |
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| 90 | Rational& operator*=(const Rational& a) |
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| 91 | { |
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| 92 | mpq_mul(value,value,a.value); |
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| 93 | return *this; |
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| 94 | } |
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| 95 | Rational& operator/=(const Rational& a) |
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| 96 | { |
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| 97 | assert(!a.isZero()); |
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| 98 | mpq_div(value,value,a.value); |
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| 99 | return *this; |
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| 100 | } |
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| 101 | friend Rational operator-(const Rational &b) |
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| 102 | { |
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| 103 | Rational ret; |
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| 104 | ret-=b; |
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| 105 | return ret; |
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| 106 | } |
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| 107 | Rational operator+(const Rational &a)const |
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| 108 | { |
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| 109 | Rational ret(*this); |
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| 110 | ret+=a; |
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| 111 | return ret; |
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| 112 | } |
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| 113 | Rational operator-(const Rational &a)const |
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| 114 | { |
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| 115 | Rational ret(*this); |
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| 116 | ret-=a; |
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| 117 | return ret; |
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| 118 | } |
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| 119 | Rational operator*(const Rational &a)const |
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| 120 | { |
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| 121 | Rational ret(*this); |
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| 122 | ret*=a; |
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| 123 | return ret; |
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| 124 | } |
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| 125 | Rational operator/(const Rational &a)const |
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| 126 | { |
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| 127 | Rational ret(*this); |
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| 128 | ret/=a; |
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| 129 | return ret; |
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| 130 | } |
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| 131 | void madd(const Rational &a,const Rational &b) |
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| 132 | { |
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| 133 | mpq_t temp; |
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| 134 | mpq_init(temp); |
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| 135 | mpq_mul(temp,a.value,b.value); |
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| 136 | mpq_add(value,value,temp); |
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| 137 | mpq_clear(temp); |
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| 138 | } |
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| 139 | bool operator<(const Rational &a)const |
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| 140 | { |
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| 141 | return mpq_cmp(value,a.value)<0; |
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| 142 | } |
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| 143 | bool operator==(const Rational &a)const |
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| 144 | { |
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| 145 | return mpq_cmp(value,a.value)==0; |
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| 146 | } |
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| 147 | bool operator!=(const Rational &a)const |
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| 148 | { |
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| 149 | return mpq_cmp(value,a.value)!=0; |
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| 150 | } |
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| 151 | /** |
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| 152 | * Returns +1,-1, or 0. |
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| 153 | */ |
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| 154 | int sign()const |
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| 155 | { |
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| 156 | return mpq_sgn(value); |
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| 157 | } |
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[19addd1] | 158 | static Rational gcd(Rational const &a, Rational const /*&b*/, Rational /*&s*/, Rational /*t*/) |
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[def863] | 159 | { |
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| 160 | /* mpz_t r; |
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| 161 | mpz_init(r); |
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| 162 | mpz_gcdext(r,s.value,t.value,a.value,b.value); |
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| 163 | Integer ret(r); |
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| 164 | mpz_clear(r);*/ |
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| 165 | assert(0); |
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| 166 | return a; |
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| 167 | } |
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| 168 | /** |
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| 169 | * Assigns the value to q. q must have been initialized as a gmp variable. |
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| 170 | */ |
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| 171 | void setGmp(mpq_t q)const |
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| 172 | { |
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| 173 | mpq_set(q,value); |
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| 174 | } |
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| 175 | }; |
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| 176 | |
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| 177 | |
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| 178 | } |
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| 179 | |
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| 180 | #endif /* LIB_Q_H_ */ |
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