[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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[5cea7a] | 13 | #include <assert.h> |
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[def863] | 14 | #include "gmp.h" |
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| 15 | |
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| 16 | #include "gfanlib_z.h" |
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| 17 | |
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| 18 | namespace gfan{ |
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| 19 | class Rational |
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| 20 | { |
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| 21 | mpq_t value; |
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| 22 | public: |
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| 23 | static bool isField() |
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| 24 | { |
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| 25 | return true; |
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| 26 | } |
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| 27 | Rational() |
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| 28 | { |
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| 29 | mpq_init(value); |
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| 30 | } |
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| 31 | Rational(signed long int value_) |
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| 32 | { |
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| 33 | mpq_init(value); |
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[5ff68b] | 34 | // mpz_init_set_si(mpq_numref(value), value_); |
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| 35 | // mpz_init_set_ui(mpq_denref(value), 1); |
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[26b713] | 36 | mpz_set_si(mpq_numref(value), value_); |
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| 37 | mpz_set_ui(mpq_denref(value), 1); |
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[def863] | 38 | mpq_canonicalize(value); |
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| 39 | } |
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| 40 | Rational(Rational const & value_) |
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| 41 | { |
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| 42 | mpq_init(value); |
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| 43 | mpq_set(value,value_.value); |
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| 44 | } |
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| 45 | Rational(mpq_t value_) |
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| 46 | { |
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| 47 | mpq_init(value); |
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| 48 | mpq_set(value,value_); |
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| 49 | } |
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| 50 | explicit Rational(Integer const & value_) |
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| 51 | { |
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| 52 | mpq_init(value); |
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[5ff68b] | 53 | // mpz_init_set(mpq_numref(value), value_.value); |
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| 54 | // mpz_init_set_ui(mpq_denref(value), 1); |
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[26b713] | 55 | mpz_set(mpq_numref(value), value_.value); |
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| 56 | mpz_set_ui(mpq_denref(value), 1); |
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[def863] | 57 | mpq_canonicalize(value); |
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| 58 | } |
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| 59 | ~Rational() |
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| 60 | { |
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| 61 | mpq_clear(value); |
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| 62 | } |
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| 63 | Rational& operator=(const Rational& a) |
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| 64 | { |
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| 65 | const Rational *A=(const Rational*)&a; |
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| 66 | if (this != A) { |
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| 67 | mpq_clear(value); |
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| 68 | mpq_init(value); |
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| 69 | mpq_set(value,a.value); |
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| 70 | } |
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| 71 | return *this; |
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| 72 | } |
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| 73 | bool isZero()const{ |
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| 74 | return mpz_sgn(mpq_numref(value))==0; |
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| 75 | } |
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| 76 | friend std::ostream &operator<<(std::ostream &f, Rational const &a) |
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| 77 | { |
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| 78 | void (*freefunc)(void *, size_t); |
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| 79 | mp_get_memory_functions(0,0,&freefunc); |
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| 80 | char *str=mpq_get_str(0,10,a.value); |
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| 81 | f<<str; |
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| 82 | freefunc(str,strlen(str)+1); |
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| 83 | return f; |
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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_add(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_sub(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 | mpq_mul(value,value,a.value); |
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| 98 | return *this; |
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| 99 | } |
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| 100 | Rational& operator/=(const Rational& a) |
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| 101 | { |
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| 102 | assert(!a.isZero()); |
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| 103 | mpq_div(value,value,a.value); |
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| 104 | return *this; |
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| 105 | } |
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| 106 | friend Rational operator-(const Rational &b) |
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| 107 | { |
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| 108 | Rational ret; |
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| 109 | ret-=b; |
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| 110 | return ret; |
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| 111 | } |
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| 112 | Rational operator+(const Rational &a)const |
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| 113 | { |
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| 114 | Rational ret(*this); |
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| 115 | ret+=a; |
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| 116 | return ret; |
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| 117 | } |
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| 118 | Rational operator-(const Rational &a)const |
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| 119 | { |
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| 120 | Rational ret(*this); |
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| 121 | ret-=a; |
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| 122 | return ret; |
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| 123 | } |
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| 124 | Rational operator*(const Rational &a)const |
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| 125 | { |
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| 126 | Rational ret(*this); |
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| 127 | ret*=a; |
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| 128 | return ret; |
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| 129 | } |
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| 130 | Rational operator/(const Rational &a)const |
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| 131 | { |
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| 132 | Rational ret(*this); |
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| 133 | ret/=a; |
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| 134 | return ret; |
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| 135 | } |
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| 136 | void madd(const Rational &a,const Rational &b) |
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| 137 | { |
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| 138 | mpq_t temp; |
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| 139 | mpq_init(temp); |
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| 140 | mpq_mul(temp,a.value,b.value); |
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| 141 | mpq_add(value,value,temp); |
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| 142 | mpq_clear(temp); |
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| 143 | } |
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| 144 | bool operator<(const Rational &a)const |
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| 145 | { |
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| 146 | return mpq_cmp(value,a.value)<0; |
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| 147 | } |
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| 148 | bool operator==(const Rational &a)const |
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| 149 | { |
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| 150 | return mpq_cmp(value,a.value)==0; |
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| 151 | } |
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| 152 | bool operator!=(const Rational &a)const |
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| 153 | { |
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| 154 | return mpq_cmp(value,a.value)!=0; |
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| 155 | } |
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| 156 | /** |
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| 157 | * Returns +1,-1, or 0. |
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| 158 | */ |
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| 159 | int sign()const |
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| 160 | { |
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| 161 | return mpq_sgn(value); |
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| 162 | } |
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[5cea7a] | 163 | static Rational gcd(Rational const &a, Rational const &b, Rational &s, Rational &t) |
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[def863] | 164 | { |
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[b1be7bd] | 165 | /* mpz_t r; |
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| 166 | mpz_init(r); |
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| 167 | mpz_gcdext(r,s.value,t.value,a.value,b.value); |
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| 168 | Integer ret(r); |
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| 169 | mpz_clear(r);*/ |
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[5cea7a] | 170 | assert(0 && "gcd for Rational not defined"); |
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[def863] | 171 | return a; |
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| 172 | } |
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| 173 | /** |
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| 174 | * Assigns the value to q. q must have been initialized as a gmp variable. |
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| 175 | */ |
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| 176 | void setGmp(mpq_t q)const |
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| 177 | { |
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| 178 | mpq_set(q,value); |
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| 179 | } |
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| 180 | }; |
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| 181 | |
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| 182 | |
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| 183 | } |
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| 184 | |
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| 185 | #endif /* LIB_Q_H_ */ |
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