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/********************* */
/** integer.h
** Original author: taking
** Major contributors: none
** Minor contributors (to current version): mdeters
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.
**
** A multiprecision integer constant.
**/
#include "cvc4_public.h"
#ifndef __CVC4__INTEGER_H
#define __CVC4__INTEGER_H
#include <gmpxx.h>
#include <string>
namespace CVC4 {
/** Hashes the gmp integer primitive in a word by word fashion. */
inline size_t gmpz_hash(const mpz_t toHash){
size_t hash = 0;
for (int i=0, n=mpz_size(toHash); i<n; ++i){
mp_limb_t limb = mpz_getlimbn(toHash, i);
hash = hash * 2;
hash = hash xor limb;
}
return hash;
}
class Rational;
class Integer {
private:
/**
* Stores the value of the rational is stored in a C++ GMP integer class.
* Using this instead of mpz_t allows for easier destruction.
*/
mpz_class d_value;
/**
* Gets a reference to the gmp data that backs up the integer.
* Only accessible to friend classes.
*/
const mpz_class& get_mpz() const { return d_value; }
/**
* Constructs an Integer by copying a GMP C++ primitive.
*/
Integer(const mpz_class& val) : d_value(val) {}
public:
/** Constructs a rational with the value 0. */
Integer() : d_value(0){}
/**
* Constructs a Integer from a C string.
* Throws std::invalid_argument if the stribng is not a valid rational.
* For more information about what is a vaid rational string,
* see GMP's documentation for mpq_set_str().
*/
Integer(const char * s, int base = 10): d_value(s,base) {}
Integer(const std::string& s, unsigned base = 10) : d_value(s, base) {}
Integer(const Integer& q) : d_value(q.d_value) {}
Integer( signed int z) : d_value(z) {}
Integer(unsigned int z) : d_value(z) {}
Integer( signed long int z) : d_value(z) {}
Integer(unsigned long int z) : d_value(z) {}
~Integer() {}
Integer& operator=(const Integer& x){
if(this == &x) return *this;
d_value = x.d_value;
return *this;
}
bool operator==(const Integer& y) const {
return d_value == y.d_value;
}
Integer operator-() const{
return Integer(-(d_value));
}
bool operator!=(const Integer& y) const {
return d_value != y.d_value;
}
bool operator< (const Integer& y) const {
return d_value < y.d_value;
}
bool operator<=(const Integer& y) const {
return d_value <= y.d_value;
}
bool operator> (const Integer& y) const {
return d_value > y.d_value;
}
bool operator>=(const Integer& y) const {
return d_value >= y.d_value;
}
Integer operator+(const Integer& y) const{
return Integer( d_value + y.d_value );
}
Integer operator-(const Integer& y) const {
return Integer( d_value - y.d_value );
}
Integer operator*(const Integer& y) const {
return Integer( d_value * y.d_value );
}
Integer operator/(const Integer& y) const {
return Integer( d_value / y.d_value );
}
std::string toString(int base = 10) const{
return d_value.get_str(base);
}
//friend std::ostream& operator<<(std::ostream& os, const Integer& n);
long getLong() const { return d_value.get_si(); }
unsigned long getUnsignedLong() const {return d_value.get_ui(); }
/**
* Computes the hash of the node from the first word of the
* numerator, the denominator.
*/
size_t hash() const {
return gmpz_hash(d_value.get_mpz_t());
}
friend class CVC4::Rational;
};/* class Integer */
struct IntegerHashStrategy {
static inline size_t hash(const CVC4::Integer& i) {
return i.hash();
}
};/* struct IntegerHashStrategy */
std::ostream& operator<<(std::ostream& os, const Integer& n);
}/* CVC4 namespace */
#endif /* __CVC4__INTEGER_H */
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